CN103544361A - Evaluation method of CO2 geological sequestration potential in oil-gas field development - Google Patents

Evaluation method of CO2 geological sequestration potential in oil-gas field development Download PDF

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CN103544361A
CN103544361A CN201310536450.8A CN201310536450A CN103544361A CN 103544361 A CN103544361 A CN 103544361A CN 201310536450 A CN201310536450 A CN 201310536450A CN 103544361 A CN103544361 A CN 103544361A
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safekeeping
oil
reservoir
geological
well
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CN103544361B (en
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王震亮
曹龙
刘妍
李子元
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Northwest University
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Northwest University
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Abstract

An evaluation method of a sequestration potential which an oil gas reservoir stratum as a CO2 geological sequestration field in an oil-gas field development aims at disadvantages of existing methods in a background technology, gives full consideration to the whole dynamic process of CO2 geological sequestration, relates to sequestered body geological comprehensive evaluation in a CO2 filling early stage, fluid trend analysis in a CO2 filling process and leakage risk evaluation after the CO2 filling is finished, and provides a method for exquisitely depicting geological features and entrapment conditions of an underground sequestered body by utilizing an oil and gas reservoir description principle. The charging, migrating and sequestering processes of the CO2 fluid are discussed based on an oil-gas migration and reservoir forming theory; loss of CO2 is revealed by the virtue of an earth surface CO2 monitoring result.

Description

CO in a kind of oil-gas field development 2the evaluation method of geological storage potentiality
Technical field
The invention belongs to CO 2energy-conserving and emission-cutting technology field, relates to the CO in a kind of oilfield exploitation procedure 2geological storage body seal potential comprehensive evaluation method up for safekeeping.
Background technology
By the CO of mankind's discharge 2trapping and be sealed in the isolated atmosphere in underground or seabed is one of important channel solving greenhouse effect.Realize this approach and mainly contain three kinds of modes: sealing up for safekeeping and sealing CO up for safekeeping in the chemical action (mineral carbonation) on earth's surface in the storage in ocean, deep layer geologic body 2.Wherein, CO 2geological storage is the current storing technology of tool potentiality in the world.The oily reservoir of discarding or develop the oil gas field of middle and later periods is to implement CO 2the ideal place of geological storage.Each oil field of China's Ordos Basin is overlapped oil-bearing series more and all be can be CO 2geological storage provides the good place of sealing up for safekeeping.First, hydrocarbon-bearing pool is formed and preserves illustrates that this area is at the construction of stable in the period of history of matter more longways so far, and has the trap of a set of complete storage-lid combination, the CO of injection 2can well be stored in reservoir rock and by cover capping layer and seal.Secondly, the abundant geologic information and the experience that in oil-gas field development, production run, accumulate are convenient to improve CO 2the feasibility of storing technology, security.Meanwhile, a set of maturation that long-term exploration of oil and gas field, development activities are set up, Reservoir description prove the best method and technology of evaluating reservoir of oil and gas geologic feature, understanding subsurface geology situation through the different regions a large amount of production practices of different oil gas fields effectively.
At present to CO 2the assessment of geological storage potentiality is still in the exploratory stage, and application is more geological analysis method and computer modeling technique, based on areal structure and geologic background, selects the suitable place of sealing up for safekeeping, primary study CO 2seal the storage and collection performance of reservoir up for safekeeping, set up the three-dimensional geological model of reservoir, carry out CO 2filled numerical simulation in reservoir, utilizes volumetric method to estimate CO 2the possible amount of sealing up for safekeeping.The method is applicable to CO more 2inject geological analysis and the Economic Evaluation in early stage, and to CO 2how the assessment of risk of leakage carries out qualitative-semi-quantitative assessment based on monitoring result.
Summary of the invention
The object of the invention is to provide a kind of oilfield development process to implement CO in oil-containing reservoir 2the sealing body fine description up for safekeeping and seal the evaluation method of potentiality up for safekeeping of geological storage.For existing methods weak point in background technology, taken into full account CO 2the whole dynamic process of geological storage, relates to CO 2that injects early stage seals the evaluation of body geological syntheses, CO up for safekeeping 2injection process fluid trend analysis and CO 2disclosure risk assessment after injection completes, proposes a kind of CO based under Reservoir Description, hydrocarbon migration theory and system monitoring technical support 2geological storage potential comprehensive analytical approach, related method and technology comprises: (1) is carried out and sealed the storage and collection performance of body reservoir, the closed performance fine description of capping layer up for safekeeping, and foundation can reflect the underground three-dimensional visualization geologic model of sealing body trap condition up for safekeeping; (2) comprehensive underground fluid dynamic condition and transporting feature, the principle of utilization hydrocarbon migration, predictably descends CO 2migratory direction and CO 2concentrate the Favorable Areas distributing; (3) on Trap evaluation feature fine description basis, carry out CO 2fill numerical simulation, evaluate CO 2filled situation in reservoir; (4) in qualitative assessment geological storage body, fill CO 2risk of leakage; (5) estimate final CO 2seal potentiality up for safekeeping.Thereby realize CO 2the comprehensive evaluation of geological storage potentiality.
Technical method of the present invention is realized by step below:
Step 1: first carry out the collection of basic data, described basic data is basic geological data and the oil geology data in region of living in, oil field, geological personnel, collecting on the basis of these data, arranges, classifies and analyze its reliability, then carries out CO 2seal body examination well and geological analysis up for safekeeping and set up CO 2seal body the integrated characteristics and trap condition data bank up for safekeeping, then on the basis of well logging and comprehensive geological analysis, set up CO 2seal body three-dimensional geological model up for safekeeping, realize and seal the Reservoir of body reservoir and the closure fine description of capping layer up for safekeeping thus, structure can reflect the underground three-dimensional geological model of sealing body the integrated characteristics and trap condition up for safekeeping;
Step 2: use principle and the new method of hydrocarbon migration, predictably descend CO 2migratory direction, CO 2the Favorable Areas concentrate distributing and possible lost passage and in view of CO 2mobility feature from the viewpoint of the power of fluid migration and conductor department two, inject CO 2active situation in reservoir, the specific implementation of this step is for carrying out CO 2migration agent is analyzed, and carries out CO 2migration agent analysis is in conjunction with advantage reservoir space distribution, test block Injection Well well pattern, reservoir inner fluid temperature and pressure and HYDRODYNAMIC CHARACTERISTICS, analyzes and injects CO 2the variation of fluid potential and potential gradient and planar characteristics of distribution, dope CO 2possible migratory direction; CO in addition 2possible migration pathway analysis in reservoir, described CO 2the transporting performance that possible migration pathway analysis in reservoir considers to seal up for safekeeping body by proposing " storativity " and " mobility-thickness product ", calculate each individual well at storativity and the mobility-thickness product of different zone of interest, predict that its planar characteristics of distribution parallel planes of going forward side by side is superimposed, the two high value coincidence district is CO 2side direction and vertical migration path, in conjunction with fluid potential gradient, distribute, CO in estimation range 2the distribution Favorable Areas that fluid is hidden and possible lost passage;
Step 3: setting up reflection CO 2seal up for safekeeping on the geologic model basis of body trap condition, with the CO doping 2migration and accumulation Favorable Areas is geologic background constraint, in conjunction with CO 2inject front and back repeatedly physical property, the saturation degree variation characteristic of log response, fully use the dynamic data of oil-field development, carry out CO 2filled numerical simulation, the specific implementation of this step, for take geologic body attribute model as basis, is set up factor of porosity, permeability saturation degree mathematics computing model for reservoir numerical simulation; And utilize formation testing in oil field, pilot production to produce dynamic data and pressure variation characteristic data, carry out the history matching of geologic model and actual production dynamic data, various parameters are adjusted repeatedly, reach meet underground truth most seal body three-dimensional geological model up for safekeeping, in history matching, obtain meeting most in addition the CO of underground actual conditions 2seal up for safekeeping after body three-dimensional geological model, with test block CO 2rate of injection, CO 2physical property, saturation degree variation characteristic that before and after injecting, repeatedly well logging responds are data source, with CO 2preserving internal migration trend analysis, assembling Favorable Areas, be geologic background constraint, CO in reservoir in simulation setting-up time 2saturation degree, pressure change and transport conditions;
Step 4: seal CO in body up for safekeeping 2risk of leakage assessment and quantitative evaluation.According to test block geologic feature, well pattern category distribution, filter out potential leak path in region, use CO 2concentration detector device, utility appliance and computer equipment are monitored, record, are analyzed, and set up CO 2leakage rate computational data collection, the specific implementation of this step comprises the mode of (1)-(3) as follows:
(1) CO in abandoned well 2directly leakage rate evaluation
Described abandoned well CO 2leakage is evaluated as and counts abandoned well position and number all in test block, at well head, places CO 2responsive monitoring equipment is monitored, and utilizes CO 2concentration monitor instrument is collected CO in certain hour 2concentration change, adopts Computer Analysis means to set up CO in abandoned well 2leakage rate assessment data collection, and then calculate the amount of leakage producing by abandoned well in certain hour m useless .
(2) CO causing by crude production activity in producing well 2the quantitative evaluation of escaping
CO in described producing well 2the quantitative evaluation of escape amount is for passing through accumulation single-well crude oil output q oil , water production rate q w , extraction CO 2gas and crude oil volume ratio g cO2-oil , extraction CO 2the volume ratio of gas and local water gco 2 -w, CO 2breakthrough time t b , CO 2reach with crude oil volume ratio the time of controlling under output gas oil ratio t o , CO 2reach with local water volume ratio the time of controlling under gas-water ratio t w these parameter quantitatives calculate CO 2escape amount m adoptgo out , derived expression is:
Figure 2013105364508100002DEST_PATH_IMAGE001
(3) by cap rock generation seepage CO 2quantitative evaluation
Described passes through cap rock quantitative evaluation for to distribute in conjunction with the aforementioned body vertical migration passage of sealing up for safekeeping, at surface soil, carries out CO 2concentration monitor, to after the scope gridding of test block at the CO that disposes certain density in surface soil 2monitoring equipment and gas collection equipment, collect CO in certain hour 2the situation of change of Leakage Gas speed, leakage rate and concentration, computer analysis means is set up CO in the whole district 2seepage mathematics computing model, the CO that assessment is caused by cap rock infiltration 2windage, thus the unification of earth's surface monitoring result and geological storage efficiency embodied;
Step 5: seal the final CO of body up for safekeeping 2the estimation of the amount of sealing up for safekeeping
Described final CO 2the estimation of the amount of sealing up for safekeeping, the mode of logical following (4) ~ (6) realizes:
(4) in conjunction with CO 2leak quantitative evaluation, calculate to inject and seal CO in body up for safekeeping 2finally return to the amount on ground.Formula is m escape = m useless + m extraction + m scatter and disappear , m escape for final CO 2escape amount, m useless for by the CO of abandoned well 2leakage rate, m extraction the CO being plucked out of by producing well 2amount, m scatter and disappear for leak out to the CO on earth's surface by cap rock 2windage;
(5) derive CO 2accumulative total injection rate IR, adopts following computing formula, m inject = v inject * t, v inject for CO 2injection rate, tfor final injection length.According to the difference of different phase injection rate, accumulative total injection rate IR adopts accumulation at times to calculate;
(6) derive CO 2the final amount of sealing up for safekeeping
Figure 941906DEST_PATH_IMAGE002
, adopt following formula to calculate,
Figure 2013105364508100002DEST_PATH_IMAGE003
.
The described CO that carries out 2seal body examination well and geological analysis up for safekeeping and set up CO 2the content of sealing body the integrated characteristics and trap condition data bank up for safekeeping comprises that body macroscopic view geological controlling factors data bank is sealed in foundation up for safekeeping, body reservoir storage and collection performance data bank is sealed in foundation up for safekeeping and body capping layer closed performance data bank is sealed in foundation up for safekeeping.
Described sets up CO on the basis of well logging and comprehensive geological analysis 2the concrete mode of sealing body three-dimensional geological model up for safekeeping for storing up respectively, each digitizing of surface construction planimetric map, sedimentary micro planimetric map, reservoir flat distribution map layer by layer of cap rock, in conjunction with layering, log data, physical property interpretation parameters, well logging interpretation distribution of oil and water layers characteristic parameter, be organized into the database of the required form of Geologic modeling; And use Geologic modeling software to set up and seal body three-dimensional geological model up for safekeeping.The model of setting up comprises CO 2seal the fine structures model of body up for safekeeping, meticulous petrofacies model, meticulous property parameters model, establishes spatial shape, the advantage reservoir of sealing body up for safekeeping by model and distributes, the space-time configuration relation of profit distribution characteristics, storage cap rock in reservoir.
Setting-up time in described step 3 is 5 years, 10 years, 50 years or 100 years.
Compared with the conventional method, the present invention is at CO 2the assessment aspect of geological storage potentiality has the following advantages:
(1) by CO 2geological storage process be considered as a CO in a short time 2the migration of fluid, one-tenth Tibetan process, this has embodied CO 2the new approaches of geological storage Potential Evaluation.Propose first with the existing mature reservoir description principle in oil-gas geology field, oil-gas migration and become to hide theory and dynamic monitoring engineering interrelated, CO is evaluated on entire system ground 2seal up for safekeeping body the integrated characteristics, trap condition, seal CO in body up for safekeeping 2the migration trend of fluid, risk of leakage quantitative evaluation and the finally calculating of the amount of sealing up for safekeeping.Related multiple theory connects each other, mutually supplementary perfect, has increased feasibility and the reliability of present technique method.
(2) to CO 2seal up for safekeeping body comprehensively, go deep into geological analysis.At CO 2seal the geologic feature of body up for safekeeping and describe in process, not only analyzed " depositing ", i.e. CO 2the storage and collection performance of Reservoir Body, has also analyzed " envelope ", covers the closed performance of capping layer on, has considered formation CO more comprehensively 2seal required whole trap condition up for safekeeping.
(3) to CO 2finally whole CO is followed in the calculating of the amount of sealing up for safekeeping 2seal process up for safekeeping, embody " mobile equilibrium " process.With seal the volumetric method adopting early stage up for safekeeping in the past, the amount of sealing up for safekeeping direction of assessment was compared, the computing method of taking more can accurately reflect the underground actual CO sealing up for safekeeping in body that seals up for safekeeping 2amount.
(4) embody underground CO 2the mobility of fluid, the new technology of oil-gas migration, one-tenth being hidden to research is applied to CO 2the evaluation of geological storage potentiality.Not only solved CO 2cO in the process of filling 2flow, migratory direction analysis, the constraint of geologic background is provided for filling numerical simulation.Simultaneously also at CO 2research after injection completes, monitor underground CO 2migration trend, fluid activity provide theoretical foundation and analytical approach.
Accompanying drawing explanation
Fig. 1 is CO in oilfield development process 2geological storage Assessment Method on Potential Technology Roadmap;
Fig. 2 seals body the integrated characteristics fine description method flow diagram up for safekeeping in summary of the invention 1;
Fig. 3 is that somewhere carbon dioxide is sealed body three-dimensional structure geologic model up for safekeeping;
Fig. 4 is that somewhere carbon dioxide is sealed body reservoir sedimentary micro flat distribution map up for safekeeping;
Fig. 5 is that somewhere carbon dioxide is sealed body reservoir net thickness flat distribution map up for safekeeping;
Fig. 6 is that somewhere carbon dioxide is sealed body porosity of sandstones log parameter interpretation mathematical model up for safekeeping;
Fig. 7 is that somewhere carbon dioxide is sealed body porosity of sandstones, permeability correlation analysis figure up for safekeeping;
Fig. 8 is that somewhere carbon dioxide is sealed body porosity of sandstones flat distribution map up for safekeeping;
Fig. 9 is that somewhere carbon dioxide is sealed body permeability of reservoir flat distribution map up for safekeeping;
Figure 10 is that somewhere carbon dioxide is sealed body reservoir oil saturation flat distribution map up for safekeeping;
Figure 11 is that somewhere carbon dioxide is sealed body reservoir storativity flat distribution map up for safekeeping;
Figure 12 is that somewhere carbon dioxide is sealed body capping layer mud stone thickness flat distribution map up for safekeeping;
Figure 13 is that somewhere carbon dioxide is sealed body storage up for safekeeping, cap rock configuration relation connects well profile figure.
Embodiment
The present invention bases oneself upon oil-gas geology process understanding CO 2geological storage in reservoir, is regarded as a homeostasis process, is the underground CO in body that seals up for safekeeping 2enter-migrate-" becoming Tibetan process " under the mobile equilibrium of scattering and disappearing.According to this thinking, in evaluating the whole dynamic process of geological storage seal potentiality up for safekeeping time, find that forefathers' research method has some limitations.(1) CO 2geological storage, not only will consider " depositing ", more will consider " envelope ".To sealing the geological analysis of body up for safekeeping, can not only limit to the Reservoir of reservoir, also need the closed performance of multianalysis capping layer, and CO 2seal the trap condition of body up for safekeeping.(2) inject underground CO 2fluid has mobility, therefore relevant CO 2filled numerical simulation need be controlled according to geology analysis result, needs to consider CO 2flow direction in sealing body up for safekeeping, migration trend, better reflection CO 2filled process.(3) CO 2leakage by cap rock etc. can be thought CO 2vertical loss, therefore assessment CO 2must be in conjunction with CO during risk of leakage 2migration process is analyzed, comparatively its Leakage of objective description.(4) CO of volumetric method estimation 2the amount of sealing up for safekeeping is that the accommodating space of take in reservoir is basis, belong to static model, and underground actual geologic feature is often more complicated, if by CO 2seal up for safekeeping and be considered as a homeostasis process, and consider the mechanism of various leakages, thus the amount of sealing up for safekeeping predicted of this method is inevitable and truth between have larger gap.
Not enough for existing methods, it is considered herein that, setting up CO 2seal the sealing up for safekeeping in potential comprehensive appraisement system process of body up for safekeeping, need emphasis to consider following problem:
(1) seal the residing structural setting of body, the geologic feature of sealing body up for safekeeping and whole trap condition up for safekeeping and whether meet CO 2sealed and formed up for safekeeping CO 2fluidity mineral reserve;
(2) CO 2as a kind of fluid, there is mobility, how to grasp and inject underground CO 2in migration trend and region, inject underground CO 2distribution trend;
(3) CO injecting 2there is the danger that leakage occurs, how to carry out CO 2leak Detection and quantifying risk assessment, by CO 2leakage control is to the degree that can grasp;
(4) CO 2in geological storage process, how to estimate more exactly and seal the CO finally sealing up for safekeeping in body up for safekeeping 2amount.
For the problems referred to above, the present invention proposes CO in a kind of oil-gas field development 2the appraisal procedure of geological storage potentiality, utilizes underground geologic feature and the trap condition of sealing body up for safekeeping of pool description method meticulous depiction; According to hydrocarbon migration theoretic discussion CO 2fluid fill, move and seal up for safekeeping process; By earth's surface CO 2monitoring result, discloses CO 2scatter and disappear, thereby be comprehensive, dynamic evaluation CO 2the potentiality of sealing up for safekeeping positive evidence is provided.
In conjunction with Integral Thought of the present invention and summary of the invention, as shown in Fig. 1-Figure 13, below the specific embodiment of the present invention is elaborated:
Using the oil-bearing series in certain oil field as CO 2seal place up for safekeeping, adopt the Potential Evaluation system of sealing up for safekeeping as shown in Figure 1, take into full account CO 2the whole dynamic process of geological storage, i.e. CO 2that injects early stage seals the evaluation of body geological syntheses, CO up for safekeeping 2injection process fluid trend analysis and CO 2disclosure risk assessment and the finally evaluation of the amount of sealing up for safekeeping after injection process has neutralized.The Potential Evaluation work of sealing up for safekeeping concrete in oil field launches according to following steps:
Step 1: carry out and seal the Reservoir of body reservoir, the closure fine description of capping layer up for safekeeping, structure can reflect the underground three-dimensional geological model of sealing body the integrated characteristics and trap condition up for safekeeping;
Described step 1, realizes by technology path as shown in Figure 2, specific as follows:
Collect basic geological data and the oil geology data in this region of living in, oil field.Described region base geologic information and oil geology data comprise: areal structure data (structural attitude, mature fault situation), drilling data (well not, well location coordinate, elevation data), well-log information, formation testing pilot production data, the means of production and core analysis test data.Collecting on the basis of these data, carry out summarizing, classification and analyze its reliability.Carry out comprehensive geology analysis, set up CO 2seal the integrated characteristics data data bank of body up for safekeeping.The step that comprises the following first step to the three steps:
The first step, carries out CO 2seal body matter controlling factor analysis on a macro scale up for safekeeping.Described CO 2seal up for safekeeping body on a macro scale matter controlling factor analysis comprise and utilize log data to divide substratum, study each zone of interest position fine structures developmental state; Appear to observe and combine with core analysis in test block, the affiliated type of sedimentary facies of body is sealed in judgement up for safekeeping, divides sedimentary micro as shown in Figure 4.
Second step, carries out CO 2the reservoir characteristic analysis of reservoir.Described CO 2the reservoir characteristic analysis of reservoir comprises division of reservoir net thickness and border, analysis reservoir spread mode and connectedness as shown in Figure 5; Comprehensive core test data and log data, set up porosity of sandstones, permeability, saturation degree physical parameter interpretation model as shown in Figure 6, Figure 7; In conjunction with formation testing pilot production data, determine the physical property of effective reservoir, electrical lower limit, divide effective reservoir thickness, reservoir interior oil water layer, analyze the planar characteristics of distribution of effective reservoir, physical property, oiliness parameter as shown in Fig. 8, Fig. 9, Figure 10; Research Reservoir Heterogeneity, carries out evaluation of classification to reservoir; Determine effective reservoir area a, thickness h, factor of porosity Φ, permeability k, oil, water saturation ( so, Sw), calculate reservoir CO 2maximum can hold space.
The 3rd step, carries out CO 2capping layer closed performance is evaluated.Described closure evaluation comprises divides capping layer lithology, determine cap rock grow scale thickness, cap rock planar characteristics of distribution and with under cover reservoir syntagmatic as shown in Figure 12 and Figure 13; Carry out breakthrough pressure, cap rock factor of porosity, the analysis of permeability physical parameter of cap rock; Breakthrough pressure analysis be take the test value of core sample laboratory simulation formation condition of test block capping layer and is basis, and then carries out breakthrough pressure and factor of porosity, permeability correlation analysis, dopes whole district's inner cap interval breakthrough pressure distribution characteristics; Calculate cap rock and can seal maximum CO 2gas column height, evaluates caprock Quality.
On well logging above and the basis of comprehensive geological analysis, set up the three-dimensional geological model of sealing body up for safekeeping in addition.Be specially first store up respectively, each digitizing of surface construction planimetric map, sedimentary micro planimetric map, reservoir flat distribution map layer by layer of cap rock, in conjunction with layering, log data, physical property interpretation parameters, well logging interpretation distribution of oil and water layers characteristic parameter, be organized into the database of the required form of Geologic modeling.With CO2, seal again individual-layer data and the elevation data position basic data of each well location in test block up for safekeeping, with the formation level that early stage, geological analysis means obtained, be characterized as constraint, use Petrel Geologic modeling software to set up the fine structures model of sealing body up for safekeeping as shown in Figure 3; Then adopt phased stochastic modeling method, the integrated characteristics data bank of geological storage body in early stage of take is geology constraint, take well logging interpretation physical property, oiliness parameter interpretation data is basis, carry out data layout of all categories unitized, set up and seal the meticulous physical property petrofacies model of body, meticulous physical property distributed model, meticulous oiliness distributed model up for safekeeping respectively; By sealing the three-dimensional geological model of body up for safekeeping, input physical property lower limit parameter, establish seal up for safekeeping body space geometry form, distributions of advantage reservoir, profit distribution characteristics, store up the space-time configuration relation of cap rock.
Step 2: use principle and the new method of hydrocarbon migration, predictably descend CO 2migratory direction, CO 2concentrate the Favorable Areas of distribution and possible lost passage.In view of CO 2mobility feature, from the viewpoint of the power of fluid migration and conductor department two, inject CO 2active situation in reservoir; Be specially and carry out CO 2migration agent is analyzed.In conjunction with advantage reservoir space distribution, test block Injection Well well pattern, reservoir inner fluid temperature, pressure and HYDRODYNAMIC CHARACTERISTICS, analyze and inject CO 2the variation of fluid potential and potential gradient and planar characteristics of distribution, dope CO 2possible migratory direction; CO 2possible migration pathway analysis in reservoir.Calculate each individual well storativity and mobility-thickness product numerical value, predict its planar characteristics of distribution as shown in figure 11; Each layer of storativity and mobility-thickness product planimetric map carry out superimposed, the careful CO that depicts 2side direction and vertical migration path; In conjunction with potential gradient, distribute, CO in estimation range 2the concentrated distribution Favorable Areas of fluid and possible lost passage.
Step 3: setting up reflection CO 2seal up for safekeeping on the geologic model basis of body trap condition, with the CO doping 2migration and accumulation Favorable Areas is geologic background constraint, in conjunction with CO 2inject front and back repeatedly physical property, the saturation degree variation characteristic of log response, fully use the dynamic data of oil-field development, carry out CO 2filled numerical simulation; Specific implementation is for take geologic body attribute model as basis, set up factor of porosity, permeability saturation degree mathematics computing model for reservoir numerical simulation, and produce dynamic data and pressure variation characteristic data according to oilfield oil testing, pilot production, take reservoir three-dimensional geological model as basis, utilize numerical simulation software to carry out the history matching of geologic model and actual production dynamic data, various parameters are adjusted repeatedly, reach meet underground truth most seal body three-dimensional geological model up for safekeeping.And in history matching, obtain meeting most the CO of underground actual conditions 2seal up for safekeeping after body three-dimensional geological model, with test block CO 2rate of injection, CO 2physical property, saturation degree variation characteristic that before and after injecting, repeatedly well logging responds are data source, with CO 2preserving internal migration trend analysis, assembling Favorable Areas, be geologic background constraint, CO in (5 years, 10 years, 50 years, 100 years) reservoir in simulation certain hour 2saturation degree, pressure change and transport conditions.
Step 4: seal CO in body up for safekeeping 2risk of leakage assessment and quantitative evaluation.According to test block geologic feature, well pattern category distribution, filter out potential leak path in region, use CO 2concentration detector device, utility appliance and computer equipment are monitored, record, are analyzed, and set up CO 2leakage rate computational data collection; Described appraisal procedure is specially and counts CO 2the number of well pattern classification and recovery well, Injection Well, abandoned well, minute layout in injection region, and carry out abandoned well CO 2directly leak quantitative evaluation, described abandoned well CO2 reveals and is evaluated as abandoned well well head CO 2monitor, utilize CO 2sensitive equipment and concentration monitor instrument are collected CO in certain hour 2leakage rate, CO 2concentration change; Adopt Computer Analysis technology to set up abandoned well CO 2leak assessment data collection, i.e. CO 2leakage rate is rule over time, the described CO occurring by abandoned well 2leakage rate evaluation method, CO 2leakage rate also can adopt following formula to calculate:
Figure 946159DEST_PATH_IMAGE004
q cO2 for CO 2leakage Gas speed (mg/s); p cO2 for sealing body internal pressure up for safekeeping (Mpa); afor leakage hole area (cm 2 ); mfor CO 2molecular weight gas (g/mol); rfor CO 2gas law constant (molK); kfor CO 2the adiabatic exponent of gas (ratio of specific heat), i.e. level pressure thermal capacitance c p with constant volume thermal capacitance c v ratio. t g for CO 2gas temperature (K), (People's Republic of China's environmental protection industry standard, HJ/T 169-2004 slightly change), add CO in producing well 2quantitative evaluation is carried out in escape.Inject underground CO 2be dissolved in crude oil or local water part CO in the activity in production in oil field 2can be plucked out of the ground with underground fluid (crude oil and local water).By accumulation single-well crude oil output q oil , water production rate q w , extraction CO 2gas and crude oil volume ratio g co2-oil , extraction CO 2the volume ratio of gas and local water gco 2 -w, CO 2breakthrough time t b , CO 2reach with crude oil volume ratio the time of controlling under output gas oil ratio t o , CO 2reach with local water volume ratio the time of controlling under gas-water ratio t w these parameter quantitatives calculate CO 2escape amount m adoptgo out , computing formula is:
Figure 2013105364508100002DEST_PATH_IMAGE005
In addition, also to the CO occurring by cap rock 2seepage carry out quantitative evaluation, related concrete appraisal procedure comprises in conjunction with early-stage Study seals body vertical migration passage up for safekeeping, and gridding is carried out in earth's surface, test block; On earth's surface far from the CO that disposes certain density in the 2-5m soil of earth's surface 2monitoring equipment and gas collection equipment, collect CO in the set time 2the variation of quantity of gas leakage, leak rate and concentration; Add up the CO that each monitoring equipment records 2leak rate and leakage rate, adopt Computer Analysis means to set up CO in the whole district 2seepage concentration, leakage mathematics computing model, in assessment certain hour, cap rock infiltration causes CO 2windage m scatter and disappear .
Step 5: seal the final CO of body up for safekeeping 2the estimation of the amount of sealing up for safekeeping, this step is specially combination CO above 2leak quantitative evaluation, calculate to inject and seal CO in body up for safekeeping 2finally return to the amount on ground.Formula is:
m escape =M useless + M extraction + M scatter and disappear .
m escape for final CO 2escape amount, m useless for by the CO of abandoned well 2leakage rate, m extraction the CO being plucked out of by producing well 2amount, m scatter and disappear for leak out to the CO on earth's surface by cap rock 2windage.
Assessment CO 2the computing method of injection rate IR are:
m inject =V inject * t
v inject for CO 2injection rate, tfor final injection length.
Finally derive CO 2the finally amount of sealing up for safekeeping
Figure 768621DEST_PATH_IMAGE002
:
Figure 973338DEST_PATH_IMAGE003
。

Claims (4)

1. CO in an oil-gas field development 2the appraisal procedure of geological storage potentiality, is characterized in that, step is as follows:
Step 1: first carry out the collection of basic data, described basic data is basic geological data and the oil geology data in region of living in, oil field, collecting on the basis of these data, arranges, classifies and analyze its reliability, then carries out CO 2seal body examination well and geological analysis up for safekeeping and set up CO 2seal body the integrated characteristics and trap condition data bank up for safekeeping, then on the basis of well logging and comprehensive geological analysis, set up CO 2seal body three-dimensional geological model up for safekeeping, realize and seal the Reservoir of body reservoir and the closure fine description of capping layer up for safekeeping thus, build and can reflect the underground three-dimensional geological model of sealing body the integrated characteristics and trap condition up for safekeeping;
Step 2: use principle and the new method of hydrocarbon migration, predictably descend CO 2migratory direction, CO 2the Favorable Areas concentrate distributing and possible lost passage and in view of CO 2mobility feature from the viewpoint of the power of fluid migration and conductor department two, inject CO 2active situation in reservoir, the specific implementation of this step is for carrying out CO 2migration agent is analyzed, and carries out CO 2migration agent analysis is in conjunction with advantage reservoir space distribution, test block Injection Well well pattern, reservoir inner fluid temperature, pressure and HYDRODYNAMIC CHARACTERISTICS, analyzes and injects CO 2the variation of fluid potential and potential gradient and planar characteristics of distribution, dope CO 2possible migratory direction; CO in addition 2possible migration pathway analysis in reservoir, described CO 2the transporting performance that possible migration pathway analysis in reservoir considers to seal up for safekeeping body by proposing " storativity " and " mobility-thickness product ", calculate each individual well at storativity and the mobility-thickness product of different zone of interest, predict that its planar characteristics of distribution parallel planes of going forward side by side is superimposed, the two high value coincidence district is CO 2side direction and vertical migration path, in conjunction with fluid potential gradient, distribute, CO in estimation range 2the distribution Favorable Areas that fluid is hidden and possible lost passage;
Step 3: setting up reflection CO 2seal up for safekeeping on the geologic model basis of body trap condition, with the CO doping 2migration and accumulation Favorable Areas is geologic background constraint, in conjunction with CO 2inject front and back repeatedly physical property, the saturation degree variation characteristic of log response, fully use the dynamic data of oil-field development, carry out CO 2filled numerical simulation, the specific implementation of this step, for take geologic body attribute model as basis, is set up for the factor of porosity of reservoir numerical simulation, the mathematics computing model of permeability saturation degree; And utilize formation testing in oil field, pilot production to produce dynamic data and pressure variation characteristic data, carry out the history matching of geologic model and actual production dynamic data, various parameters are adjusted repeatedly, reach meet underground truth most seal body three-dimensional geological model up for safekeeping, in history matching, obtain meeting most in addition the CO of underground actual conditions 2seal up for safekeeping after body three-dimensional geological model, with test block CO 2rate of injection, CO 2physical property, saturation degree variation characteristic that before and after injecting, repeatedly well logging responds are data source, with CO 2preserving internal migration trend analysis, assembling Favorable Areas, be geologic background constraint, CO in reservoir in simulation setting-up time 2saturation degree, pressure change and transport conditions;
Step 4: seal CO in body up for safekeeping 2risk of leakage assessment and quantitative evaluation.
2. according to test block geologic feature, well pattern category distribution, filter out potential leak path in region, use CO 2concentration detector device, utility appliance and computer equipment are monitored, record, are analyzed, and set up CO 2leakage rate computational data collection, the specific implementation of this step comprises the mode of (1)-(3) as follows:
(1) CO in abandoned well 2directly leakage rate evaluation
Described abandoned well CO 2leakage is evaluated as and counts abandoned well position and number all in test block, at well head, places CO 2responsive monitoring equipment is monitored, and utilizes CO 2concentration monitor instrument is collected CO in certain hour 2concentration change, adopts Computer Analysis means to set up CO in abandoned well 2leakage rate assessment data collection, and then calculate the amount of leakage producing by abandoned well in certain hour m useless ;
(2) CO causing by crude production activity in producing well 2the quantitative evaluation of escaping
CO2 escape amount quantitative evaluation in described producing well is for passing through accumulation single-well crude oil output q oil , water production rate q w , extraction CO 2gas and crude oil volume ratio g co2-oil , extraction CO 2the volume ratio of gas and local water gco 2 -w, CO 2breakthrough time t b , CO 2reach with crude oil volume ratio the time of controlling under output gas oil ratio t o , CO 2reach with local water volume ratio the time of controlling under gas-water ratio t w these parameter quantitatives calculate CO 2escape amount m adoptgo out , derived expression is:
Figure 697140DEST_PATH_IMAGE001
(3) by cap rock generation seepage CO 2quantitative evaluation
Described passes through cap rock quantitative evaluation for to distribute in conjunction with the aforementioned body vertical migration passage of sealing up for safekeeping, at surface soil, carries out CO 2concentration monitor, to after the scope gridding of test block at the CO that disposes certain density in surface soil 2monitoring equipment and gas collection equipment, collect CO in certain hour 2the situation of change of Leakage Gas speed, leakage rate and concentration, computer analysis means is set up CO in the whole district 2seepage mathematics computing model, the CO that assessment is caused by cap rock infiltration 2windage, thus the unification of earth's surface monitoring result and geological storage efficiency embodied;
Step 5: seal the final CO of body up for safekeeping 2the estimation of the amount of sealing up for safekeeping
Described final CO 2the estimation of the amount of sealing up for safekeeping, the mode of logical following (4) ~ (6) realizes:
(4) in conjunction with CO 2leak quantitative evaluation, calculate to inject and seal CO in body up for safekeeping 2finally return to the amount on ground;
Formula is m escape = m useless + m extraction + m scatter and disappear , m escape for final CO 2escape amount, m useless for by the CO of abandoned well 2leakage rate, m extraction the CO being plucked out of by producing well 2amount, m scatter and disappear for leak out to the CO on earth's surface by cap rock 2windage;
(5) derive CO 2accumulative total injection rate IR, adopts following computing formula, m inject = v inject * t, v inject for CO 2injection rate, tfor final injection length;
According to the difference of different phase injection rate, accumulative total injection rate IR adopts accumulation at times to calculate;
(6) derive CO 2the final amount of sealing up for safekeeping
Figure 366019DEST_PATH_IMAGE002
, adopt following formula to calculate,
Figure 359383DEST_PATH_IMAGE003
.
3. CO in oil-gas field development according to claim 1 2the appraisal procedure of geological storage potentiality, is characterized in that the described CO that carries out 2seal body examination well and geological analysis up for safekeeping and set up CO 2the content of sealing body the integrated characteristics and trap condition data bank up for safekeeping comprises that body macroscopic view geological controlling factors data bank is sealed in foundation up for safekeeping, body reservoir storage and collection performance data bank is sealed in foundation up for safekeeping and body capping layer closed performance data bank is sealed in foundation up for safekeeping.
4. CO in oil-gas field development according to claim 1 2the appraisal procedure of geological storage potentiality, is characterized in that described on the basis of well logging and comprehensive geological analysis, setting up CO 2seal body three-dimensional geological model up for safekeeping, concrete mode for storing up respectively, each digitizing of surface construction planimetric map, sedimentary micro planimetric map, reservoir flat distribution map layer by layer of cap rock, in conjunction with layering, log data, physical property interpretation parameters, well logging interpretation distribution of oil and water layers characteristic parameter, be organized into the database of the required form of Geologic modeling; And use Geologic modeling software to set up and seal body three-dimensional geological model up for safekeeping;
The model of setting up comprises CO 2seal the fine structures model of body up for safekeeping, meticulous petrofacies model, meticulous property parameters model, establishes spatial shape, the advantage reservoir of sealing body up for safekeeping by model and distributes, the space-time configuration relation of profit distribution characteristics, storage cap rock in reservoir;
CO in described oil-gas field development according to claim 1 2the appraisal procedure of geological storage potentiality, is characterized in that the setting-up time in step 3 is 5 years, 10 years, 50 years or 100 years.
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