CN105784965A - Method and system for testing geoscience evolution based on simulation experiment - Google Patents
Method and system for testing geoscience evolution based on simulation experiment Download PDFInfo
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Abstract
The invention provides a method and a system for testing the evolution of a field history based on a simulation experiment, wherein the method for testing the evolution of the field history based on the simulation experiment comprises the following steps: determining the sample component proportion and the fluid component proportion according to rock parameters of a rock stratum to be researched, which are obtained in advance; matching a pre-obtained sample according to the sample component proportion to form a simulated sample, and matching a pre-obtained reagent according to the fluid component proportion to form a diagenetic fluid; adding a diagenetic fluid into a simulation sample according to set experimental parameters according to a diagenetic mode of early long-term shallow burying and later fast deep burying, and performing diagenetic treatment to obtain at least one sandstone forming sample; and carrying out rock analysis and test on each sandstone forming sample to obtain physical property parameter distribution and a diagenetic evolution process of each diagenetic stage of the rock stratum to be researched. The qualitative and quantitative evaluation work of the reservoir of the rock to be researched is guided by determining physical parameters and diagenetic evolution processes of different diagenetic stages, and the accuracy of reservoir evaluation is effectively improved.
Description
Technical field
The present invention relates to oil exploration technology, particularly relate to a kind of geologic evolution method of testing based on simulation experiment and system.
Background technology
In the car foreland basin of storehouse, there is good petroleum-geologic condition, deep layer Cretaceous Sandstone Reservoirs has been issued a series of Large gas field at present under salt.Owing to reservoir buried depth is relatively big, the nearly 7000m of average buried depth, therefore need the simulation carrying out rock reservoir that reservoir is predicted in this region.
Current mode is can to obtain the physical parameters such as the lash types of reservoir, content, pore size by the diagenetic process of reservoir is carried out accurate simulation, thus reservoir is made correct evaluation and prediction.The diagenetic physical simulation experiment carried out both at home and abroad at present biases toward monofactorial Compaction or organic acid dissolution experiment more, simulated conditions bias toward shallow-layer or normal temperature and pressure environment, due to the functional restriction of simulator, its experiment conclusion application is strong, and that the simulation experiment being directed under the multifactor and complex environment under the constraint of study area reservoir corresponding geological evolution history is carried out is relatively fewer.
The experiment of existing diagenetic physical simulation is only capable of according to living through different times geologic evolution and the improved rock sample of various diagenesis carries out reservoir forming mechanism and evaluation and foreca research, owing to complexity and the early stage transformation result of superposition are easily destroyed by Late reformation result, the Mechanism evaluation and the prediction that make diagenetic process also exist many derivation conclusions, and accuracy is relatively low.
Summary of the invention
Geologic evolution method of testing based on simulation experiment provided by the invention and system, for solving in prior art owing to the complexity of superposition and early stage transformation result are easily destroyed by Late reformation result, the Mechanism evaluation and the prediction that make diagenetic process also exist many derivation conclusions, the problem that accuracy is relatively low.
One aspect of the present invention provides a kind of geologic evolution method of testing based on simulation experiment, including:
Rock parameter according to the rock stratum to be studied obtained in advance determines sample composition ratio and fluid composition ratio；
Carry out proportioning according to the described sample composition ratio sample to obtaining in advance and form analog sample, and carry out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids；
According to the Petrogenetic Model that early stage long-term shallow embedding, later stage are quickly buried, described Diagenesis fluids is added described analog sample according to setting experiment parameter, and carry out diagenesis process, obtain at least one sandstone molded samples；
Each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied；Described petrographical analysis test includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures.
Optionally, before the rock parameter of the rock stratum to be studied that described basis obtains in advance determines sample composition ratio and fluid composition ratio, described method also includes:
Obtain chip rock forming mineral and the chink of described rock stratum to be studied；
Detect described chip rock forming mineral and described chink, obtaining the rock parameter of described rock stratum to be studied, the rock parameter of described Study of Strata includes mineralogical composition composition, mineralogical composition content, mineral grain class distribution, chink become to be grouped into, chink component content, chink grain class distribution, porosity value, permeability value and distribution of pores three-dimensional feature.
Optionally, the rock parameter of the rock stratum to be studied that described basis obtains in advance determines sample composition ratio and fluid composition ratio, including:
According to described mineralogical composition composition, mineralogical composition content, mineral grain class distribution, chink become to be grouped into, chink component content, chink grain class distribution, porosity value, permeability value and distribution of pores three-dimensional feature determine described sample composition ratio；
Determine the feature of Diagenesis fluids according to the different mineralogical composition compositions of diagenetic stage, mineralogical composition content, formation water condition degree, and the feature according to the Diagenesis fluids of each diagenetic stage determines fluid composition ratio；Described fluid composition ratio includes percentage ratio and the fluid concentrations percentage ratio of each composition of fluid.
Optionally, described according to setting the experiment parameter Petrogenetic Model that shallow embedding, later stage are quickly buried for a long time according to early stage by the described Diagenesis fluids described analog sample of addition, and carry out diagenesis process, obtain at least one sandstone molded samples, including:
After described analog sample mix homogeneously, in described Diagenesis fluids, soak at least 24 hours；
The diagenesis model quickly buried according to early stage long-term shallow embedding, later stage sets experiment parameter；Described experiment parameter includes: maximum experimental temperature, maximum experimental pressure, heating rate, heating-up time, rate of pressure rise, pressure rising time and heat-insulation pressure keeping time；
Control the temperature of reacting furnace, pressure and time in diagenetic process according to described experiment parameter, the described analog sample soaked through Diagenesis fluids is carried out diagenesis process in the oxidoreduction diagenetic environment set, forms at least one sandstone molded samples.
Optionally, described petrographical analysis test also includes the qualification of rock casting body flake, reservoir properties measurement, the measurement of larynx footpath, aperture, scanning electron microscopic observation and X-ray clay analysis.
Optionally, described each sandstone molded samples is carried out petrographical analysis test, obtain physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied, including:
Each described sandstone molded samples carries out rock casting body flake qualification, reservoir properties measurement, the measurement of larynx footpath, aperture, scanning electron microscopic observation, the analysis of X-ray clay, nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument respectively measure, obtain the test result of described sandstone molded samples；
The geologic information of described test result with the actual rock stratum described to be studied obtained is contrasted, analyze the physical parameter variation tendency of sample in rock stratum Evolution, rock stratum formation mechenism, mineral output and diagenetic process, obtain physical parameter distribution and the diagenesis evolution process of described rock stratum to be studied difference diagenetic stage.
Optionally, the physical parameter of described each diagenetic stage includes the porosity type of rock in this stage, voids content, pore size and Pore throat size.
Second aspect present invention provides a kind of geologic evolution based on simulation experiment to test system, including: harvester, matching device, control device, reaction unit, process device；
Described harvester is for determining sample composition ratio and fluid composition ratio according to the rock parameter of the rock stratum to be studied obtained in advance；
Described matching device forms analog sample for carrying out proportioning according to the described sample composition ratio sample to obtaining in advance, and carries out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids；
Described control device is for controlling according to setting the experiment parameter Petrogenetic Model that shallow embedding, later stage are quickly buried for a long time according to early stage by the described Diagenesis fluids described analog sample of addition, and carries out diagenesis process, obtains at least one sandstone molded samples；
Described process device is used for, and each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied；Described petrographical analysis test includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures.
Optionally, described reaction unit includes reacting furnace, hydraulic press and piston pump；Described reacting furnace is connected with static pressure machine and piston pump respectively；
Described reacting furnace is used for holding analog sample, and controls temperature according to described experiment parameter；
Described static pressure machine for controlling pressure according to described experiment parameter in diagenetic process；
Described piston pump for providing fluid and fluid pressure for described analog sample.
nullGeologic evolution method of testing based on simulation experiment provided by the invention and system，The rock parameter of the rock stratum to be studied by obtaining in advance determines sample composition ratio and fluid composition ratio，And the component ratio sample to obtaining in advance carries out proportioning formation analog sample per sample，And carry out proportioning according to the fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids，Then according to setting experiment parameter according to early stage long-term shallow embedding、Diagenesis fluids is added analog sample by later stage quickly buried Petrogenetic Model，And carry out diagenesis process，Obtain at least one sandstone molded samples，Respectively each sandstone molded samples is carried out petrographical analysis test，Obtain physical parameter distribution and the diagenesis evolution process of each diagenetic stage in rock stratum to be studied，Qualitative and the quantitative assessment to rock reservoir to be studied is instructed to work，It is effectively improved the accuracy of evaluating reservoir.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the present invention flow chart based on the geologic evolution method of testing embodiment one of simulation experiment；
Fig. 2 is the present invention flow chart based on the geologic evolution method of testing embodiment two of simulation experiment；
Fig. 3 a is the present invention flow chart based on the geologic evolution method of testing embodiment three of simulation experiment；
Fig. 3 b is the early stage long-term shallow embedding of rock stratum to be studied, later stage quickly buried geologic evolution schematic diagram；
Fig. 3 c is the experimental simulation geologic evolution schematic diagram of the embodiment of the present invention three；
Fig. 4 is the schematic diagram of the reservoir diagenetic simulation system that the embodiment of the present invention three adopts；
Fig. 5 is the present invention flow chart based on the geologic evolution method of testing embodiment four of simulation experiment；
Fig. 6 is the pore evolution trendgram that the method for embodiment three and embodiment four obtains；
Fig. 7 is the present invention structural representation based on the embodiment one of the geologic evolution test system of simulation experiment.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Fig. 1 is the present invention flow chart based on the geologic evolution method of testing embodiment one of simulation experiment, as it is shown in figure 1, be somebody's turn to do concretely comprising the following steps of the geologic evolution method of testing based on simulation experiment:
S101: determine sample composition ratio and fluid composition ratio according to the rock parameter of the rock stratum to be studied obtained in advance.
In the present embodiment, the composition of the chip rock mineral composition of the rock stratum Reservoir Body sandstone according to district to be studied and the composition of content, grain class distribution and chink composition and content, grain class distribution determine the component ratio of laboratory sample, i.e. sample composition ratio, and under the diagenesis evolution history restriction in study area, design different buried depth temperature, pressure changing value and response time, set corresponding oxidoreduction diagenetic environment, and determine the chemical composition of the fluid of the different phase supply of experiment and the percentage ratio of composition, i.e. fluid composition ratio.
S102: carry out proportioning according to the described sample composition ratio sample to obtaining in advance and form analog sample, and carry out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids.
S103: according to the Petrogenetic Model that early stage long-term shallow embedding, later stage are quickly buried, described Diagenesis fluids is added described analog sample according to setting experiment parameter, and carry out diagenesis process, obtain at least one sandstone molded samples.
In the present embodiment, determine the design of early stage long-term shallow embedding later stage quick buried diagenesis evolution simulation experiment, including experimental temperature, pressure and time parameters, determine diagenetic environment be open, closed and fluid supply mode, capacity, batch etc., and the collection mode etc. of fluid after reaction, then carry out diagenesis according to the experiment parameter of setting and process experiment, finally obtain the sandstone molded samples standing the generation of different temperatures pressure stage.
Generally, arranging multiple experimental ware, produce the sandstone molded samples of five or above number, in order in post analysis processing procedure, statistics improves accuracy.
S104: each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied；Described petrographical analysis test includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures.
In the present embodiment, simulation molded samples is carried out according to normal reservoir study method the analysis test being correlated with, and compare with the geologic information of actual Reservoir Body, the mode such as concrete analysis test method includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope measures, nitrogen adsorption instrument analysis and high-pressure mercury instrument mensuration.
Determine physical parameter distribution characteristics and the diagenesis evolution process of different diagenetic stage sandstone reservoir, complete the qualitative of study area sandstone reservoir and quantitative assessment work.
nullThe geologic evolution method of testing based on simulation experiment that the present embodiment provides，The rock parameter of the rock stratum to be studied by obtaining in advance determines sample composition ratio and fluid composition ratio，And the component ratio sample to obtaining in advance carries out proportioning formation analog sample per sample，And carry out proportioning according to the fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids，Then according to setting experiment parameter according to early stage long-term shallow embedding、Diagenesis fluids is added analog sample by later stage quickly buried Petrogenetic Model，And carry out diagenesis process，Obtain at least one sandstone molded samples，Respectively each sandstone molded samples is carried out petrographical analysis test，Obtain physical parameter distribution and the diagenesis evolution process of each diagenetic stage in rock stratum to be studied，It is used for instructing the qualitative and quantitative assessment work treating research rock reservoir，It is effectively improved the accuracy of evaluating reservoir.
Fig. 2 is the present invention flow chart based on the geologic evolution method of testing embodiment two of simulation experiment, as in figure 2 it is shown, on the basis of above-described embodiment, concretely comprising the following steps of the geologic evolution method of testing based on simulation experiment of the present embodiment:
S201: obtain chip rock forming mineral and the chink of described rock stratum to be studied.
S202: detect described chip rock forming mineral and described chink, obtaining the rock parameter of described rock stratum to be studied, the rock parameter of described Study of Strata includes mineralogical composition composition, mineralogical composition content, mineral grain class distribution, chink become to be grouped into, chink component content, chink grain class distribution, porosity value, permeability value and distribution of pores three-dimensional feature.
S203: according to described mineralogical composition composition, mineralogical composition content, mineral grain class distribution, chink become to be grouped into, chink component content, chink grain class distribution, porosity value, permeability value and distribution of pores three-dimensional feature determine described sample composition ratio.
In the present embodiment, the sandstone chip rock forming mineral component of research region layer position, content, grain class distribution and the component of chink, content, grain class distribution etc. and porosity value, permeability value and space that statistical analysis obtains are distributed three-dimensional feature etc., so that it is determined that the proportioning of laboratory sample.
S204: determine the feature of Diagenesis fluids according to the different mineralogical composition compositions of diagenetic stage, mineralogical composition content, formation water condition degree, and the feature according to the Diagenesis fluids of each diagenetic stage determines fluid composition ratio；Described fluid composition ratio includes percentage ratio and the fluid concentrations percentage ratio of each composition of fluid.
In the present embodiment, the principal character of Diagenesis fluids is determined according to different diagenetic stage authigenic mineral paragenetic associations, the various percentage compositions of proportioning sample and fluid concentrations percentage ratio needed for determining the different phase of experiment, the geologic evolution feature that analysis and research district early stage in the long-term shallow embedding later stage is quickly buried, collect geothermal gradient and pressure dependence parameter, complete the arrangement of geologic elements needed for simulation experiment.
S205: carry out proportioning according to the described sample composition ratio sample to obtaining in advance and form analog sample, and carry out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids.
In the present embodiment, prepare the sample needing experiment and corresponding fluid by the proportioning determined, and by each laboratory sample Homogeneous phase mixing, the laboratory sample after mix homogeneously respectively, and prepare various acidity, alkaline fluids, place in container and use in order to experiment.
S206: according to the Petrogenetic Model that early stage long-term shallow embedding, later stage are quickly buried, described Diagenesis fluids is added described analog sample according to setting experiment parameter, and carry out diagenesis process, obtain at least one sandstone molded samples.
S207: each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied.
In the present embodiment, except above-mentioned analysis test method, described petrographical analysis test also includes the qualification of rock casting body flake, reservoir properties measurement, the measurement of larynx footpath, aperture, scanning electron microscopic observation and X-ray clay analysis.
The geologic evolution method of testing based on simulation experiment that the present embodiment provides, reproduction stage by stage is carried out by the reservoir diagenetic phenomenon that sandstone early stage long-term shallow embedding later stage quick buried geologic evolution diagenetic process analogue experiment method is buried the stage for difference, the disposable simulation step by step of complicated reservoir diagenetic evolutionary process is completed, such that it is able to from sand reservoir early stage sand body formation, fine and close and the later stage the diagenesis transformation of the compacting in mid-term conducts a research by stages, reservoir is evaluated on qualitative, quantitative ground more accurately, the different Sandstone Gas Reservoir diagenesis transformation burying the stage will be characterized for qualitative, quantitative, porosity distribution and reservoir genesis Analysis on Mechanism provide experimental data and the scientific basis of just drilling process, set up tight sand Favorable Reservoir to evaluate and fundamentals of forecasting theory.
Fig. 3 a is the present invention flow chart based on the geologic evolution method of testing embodiment three of simulation experiment, as shown in Figure 3 a, on the basis of above-described embodiment, in step S103, according to the Petrogenetic Model that early stage long-term shallow embedding, later stage are quickly buried, described Diagenesis fluids is added described analog sample according to setting experiment parameter, and carry out diagenesis process, the step that implements obtaining at least one sandstone molded samples is:
S301: after described analog sample mix homogeneously, soak at least 24 hours in described Diagenesis fluids.
In the present embodiment, the sample needing experiment and corresponding fluid is prepared by the proportioning determined, and by each laboratory sample Homogeneous phase mixing respectively, laboratory sample after mix homogeneously soaks more than 24 hours with corresponding fluid respectively, and prepare various acidity, alkaline fluids, place in container and use in order to experiment.
S302: the diagenesis model quickly buried according to early stage long-term shallow embedding, later stage sets experiment parameter；Described experiment parameter includes: maximum experimental temperature, maximum experimental pressure, heating rate, heating-up time, rate of pressure rise, pressure rising time and heat-insulation pressure keeping time.
In the present embodiment, determine the design of early stage long-term shallow embedding, later stage quick buried diagenesis evolution simulation experiment, including experimental temperature, pressure and time parameters, determine diagenetic environment be open, closed and the mode of fluid supply, capacity, batch etc., and the collection mode etc. of fluid after reaction.Fig. 3 b is the early stage long-term shallow embedding of rock stratum to be studied, later stage quickly buried geologic evolution schematic diagram, in the present embodiment, the study area sandstone reservoir according to Fig. 3 b experienced by under this diagenesis evolution history of geologic evolution diagenetic process constraint that the shallow embedding later stage is quickly buried for a long time in early days, being designed as whole sandstone reservoir early stage stands Reservoir Body under one section of longer experimental period, lower temperature pressure condition and preliminarily forms, and then experienced by the simulation experiment scheme to the transformation of sand reservoir diagenesis that temperature, pressure in shorter experimental period quickly raise and occurs.
S303: control the temperature of reacting furnace, pressure and time in diagenetic process according to described experiment parameter, carries out diagenesis process by the described analog sample soaked through Diagenesis fluids in the oxidoreduction diagenetic environment set, forms at least one sandstone molded samples.
In the present embodiment, Fig. 3 c is the experimental simulation geologic evolution schematic diagram of the embodiment of the present invention three.Parameter setting to have relatedness with geological evolution, it is desirable to whole experimentation one-time continuous completes.Below, especially exemplified by one group of experiment parameter of example so that the practicality of this programme to be described, concrete experiment parameter such as table 1 below:
The whole process of simulation experiment is completed according to design；Fig. 4 is the schematic diagram of the reservoir diagenetic simulation system that the embodiment of the present invention three adopts.Petrogenetic Simulation system in figure includes six reacting furnaces and the hydraulic press being connected with reacting furnace, the piston pump that are numbered 1-6.One laboratory sample of difference in six reacting furnaces, piston pump provides corresponding fluid and fluid pressure according to design for laboratory sample, and static pressure machine provides lithostatic pressure, and reacting furnace is that laboratory sample provides corresponding experimental temperature according to design.Reservoir diagenetic simulation system can be passed through computer realize automatically controlling to temperature, pressure etc..Be respectively provided with the experiment parameters such as the maximum experimental temperature of each body of heater experience, maximum experimental pressure, heating rate, heating-up time, rate of pressure rise, pressure rising time, heat-insulation pressure keeping time in control system according to design, whole experimentation can complete under automatic control.
Fig. 5 is the present invention flow chart based on the geologic evolution method of testing embodiment four of simulation experiment, as shown in Figure 5, on the basis of above-described embodiment, each sandstone molded samples carries out petrographical analysis test by step S104, obtains the physical parameter distribution of each diagenetic stage in described rock stratum to be studied and concretely comprising the following steps of diagenesis evolution process:
S401: each described sandstone molded samples is carried out respectively rock casting body flake qualification, reservoir properties measurement, the measurement of larynx footpath, aperture, scanning electron microscopic observation, the analysis of X-ray clay, nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures, obtain the test result of described sandstone molded samples.
In the present embodiment, after simulation experiment terminates, complete to unload sample, photograph and sample number into spectrum work.The sample tested after terminating in each body of heater represents respectively and stands different temperatures, pressure, the corresponding product of time and the improved different diagenetic stage sand reservoirs of different fluid, simulation molded samples is carried out rock casting body flake qualification, reservoir properties and larynx footpath, aperture are measured, scanning electron microscopic observation, X-ray clay, nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope measures, the correlation analysiss such as the analysis of nitrogen adsorption instrument and high-pressure mercury instrument mensuration, and the dependence test of analog sample is contrasted with analysis of data and actual geologic information, the research work such as arrangement；The Evolution of reservoir inherence, analysis research district and formation mechenism, by the variation tendency etc. of the reformation characteristics transitivity relevant parameter of simulation rock sample is carried out qualitative and quantitative analysis by the different fluid ions Transports of diagenetic process sample, the output of authigenic mineral and paragenetic association, not syndiagenesis, thus the reservoir evaluation and prediction research in the district that directs study.
S402: the geologic information of described test result with the actual rock stratum described to be studied obtained is contrasted, analyze the physical parameter variation tendency of sample in rock stratum Evolution, rock stratum formation mechenism, mineral output and diagenetic process, obtain physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied.
In the present embodiment, the physical parameter of described each diagenetic stage includes the porosity type of rock in this stage, voids content, pore size and Pore throat size.Complete physical parameter distribution characteristics and the diagenesis evolution processes such as the different porosity type of diagenetic stage sandstone reservoir, content, aperture Pore throat sizes, complete the qualitative of study area sandstone reservoir and quantitative assessment work.The analysis that the molded samples being about to obtain carries out being correlated with measures, and it is tested the parameter obtained and analyzes test result, for the research of study area sand reservoir diagenesis evolution process and formation mechenism.
In conjunction with the embodiments three example and embodiment four in analyzing and processing, above-mentioned to certain district's foreland basin tight sand long-term shallow embedding later stage this diagenetic process simulation experiment study of quick buried geologic evolution in early days, simulate sample of sandstone for different phase and carry out sheet plane porosity statistical analysis, it was demonstrated that pore evolution has obvious four sections of property features.Fig. 6 is the pore evolution trendgram that the method for embodiment three and embodiment four obtains.First stage sandstone reservoir is through early stage long-term shallow embedding compacting process, and porosity type is mainly primary hole, and Areal porosity is reduced to 18% by 40%；Second stage sandstone reservoir is in the quick buried transition period in long-term shallow embedding-later stage, and the speed that hole reduces substantially weakens, and Areal porosity is reduced to 13% by 18%；Phase III is the commitment of rapid burial, and the change of hole total amount is less, but porosity type changes greatly, and primary hole is quickly reduced, and corrosion hole quickly increases, and Areal porosity is reduced to 11% by 13%, is the critical period of deep Favorable Reservoir formation；Fourth stage is diagenetic stage in evening, and corrosion hole and primary hole content continue to reduce, and < 10%, above sign has reproduced the regularity of study area sand reservoir pore evolution to total pore surface rate well.
Fig. 7 is the present invention structural representation based on the geologic evolution test system embodiment one of simulation experiment, as shown in Figure 7, system 10 should be tested based on the geologic evolution of simulation experiment, including: harvester 11, matching device 12, control device 13, reaction unit 14 and process device 15.
Described harvester 11 is for determining sample composition ratio and fluid composition ratio according to the rock parameter of the rock stratum to be studied obtained in advance；
Described matching device 12 forms analog sample for carrying out proportioning according to the described sample composition ratio sample to obtaining in advance, and carries out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids；
Described control device 13 is for controlling according to setting the experiment parameter Petrogenetic Model that shallow embedding, later stage are quickly buried for a long time according to early stage by the described Diagenesis fluids described analog sample of addition, and carry out diagenesis process in described reaction unit 14, obtain at least one sandstone molded samples；
Described process device 15 is used for, and each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied；Described petrographical analysis test includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures.
In the present embodiment, described reaction unit 14 includes reacting furnace, hydraulic press and piston pump；Described reacting furnace is connected with static pressure machine and piston pump respectively；Described reacting furnace is used for holding analog sample, and controls temperature according to described experiment parameter；Described static pressure machine for controlling pressure according to described experiment parameter in diagenetic process；Described piston pump for providing fluid and fluid pressure for described analog sample.
Volume cost application for reacting furnace, hydraulic press and piston pump is not limited as, and can select according to practical situation.
The geologic evolution based on simulation experiment that the present embodiment provides tests system, and for performing the technical scheme of the method shown in Fig. 1-6, its technique effect, with to realize principle similar, does not repeat them here.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (9)
1. the geologic evolution method of testing based on simulation experiment, it is characterised in that including:
Rock parameter according to the rock stratum to be studied obtained in advance determines sample composition ratio and fluid composition ratio；
Carry out proportioning according to the described sample composition ratio sample to obtaining in advance and form analog sample, and carry out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids；
According to the Petrogenetic Model that early stage long-term shallow embedding, later stage are quickly buried, described Diagenesis fluids is added described analog sample according to setting experiment parameter, and carry out diagenesis process, obtain at least one sandstone molded samples；
Each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied；Described petrographical analysis test includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures.
2. method according to claim 1, it is characterised in that before the rock parameter of the rock stratum to be studied that described basis obtains in advance determines sample composition ratio and fluid composition ratio, described method also includes:
Obtain chip rock forming mineral and the chink of described rock stratum to be studied；
Detect described chip rock forming mineral and described chink, obtaining the rock parameter of described rock stratum to be studied, the rock parameter of described Study of Strata includes mineralogical composition composition, mineralogical composition content, mineral grain class distribution, chink become to be grouped into, chink component content, chink grain class distribution, porosity value, permeability value and distribution of pores three-dimensional feature.
3. method according to claim 2, it is characterised in that the rock parameter of the rock stratum to be studied that described basis obtains in advance determines sample composition ratio and fluid composition ratio, including:
According to described mineralogical composition composition, mineralogical composition content, mineral grain class distribution, chink become to be grouped into, chink component content, chink grain class distribution, porosity value, permeability value and distribution of pores three-dimensional feature determine described sample composition ratio；
Determine the feature of Diagenesis fluids according to the different mineralogical composition compositions of diagenetic stage, mineralogical composition content, formation water condition degree, and the feature according to the Diagenesis fluids of each diagenetic stage determines fluid composition ratio；Described fluid composition ratio includes percentage ratio and the fluid concentrations percentage ratio of each composition of fluid.
4. method according to claim 3, it is characterized in that, described according to setting the experiment parameter Petrogenetic Model that shallow embedding, later stage are quickly buried for a long time according to early stage by the described Diagenesis fluids described analog sample of addition, and carry out diagenesis process, obtain at least one sandstone molded samples, including:
After described analog sample mix homogeneously, in described Diagenesis fluids, soak at least 24 hours；
The diagenesis model quickly buried according to early stage long-term shallow embedding, later stage sets experiment parameter；Described experiment parameter includes: maximum experimental temperature, maximum experimental pressure, heating rate, heating-up time, rate of pressure rise, pressure rising time and heat-insulation pressure keeping time；
Control the temperature of reacting furnace, pressure and time in diagenetic process according to described experiment parameter, the described analog sample soaked through Diagenesis fluids is carried out diagenesis process in the oxidoreduction diagenetic environment set, forms at least one sandstone molded samples.
5. the method according to any one of Claims 1-4, it is characterised in that described petrographical analysis test also includes the qualification of rock casting body flake, reservoir properties measurement, the measurement of larynx footpath, aperture, scanning electron microscopic observation and X-ray clay analysis.
6. method according to claim 5, it is characterised in that described each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied, including:
Each described sandstone molded samples carries out rock casting body flake qualification, reservoir properties measurement, the measurement of larynx footpath, aperture, scanning electron microscopic observation, the analysis of X-ray clay, nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument respectively measure, obtain the test result of described sandstone molded samples；
The geologic information of described test result with the actual rock stratum described to be studied obtained is contrasted, analyze the physical parameter variation tendency of sample in rock stratum Evolution, rock stratum formation mechenism, mineral output and diagenetic process, obtain physical parameter distribution and the diagenesis evolution process of described rock stratum to be studied difference diagenetic stage.
7. method according to claim 6, it is characterised in that the physical parameter of described each diagenetic stage includes the porosity type of rock in this stage, voids content, pore size and Pore throat size.
8. the geologic evolution based on simulation experiment tests system, it is characterised in that including: harvester, matching device, control device, reaction unit, processes device；
Described harvester is for determining sample composition ratio and fluid composition ratio according to the rock parameter of the rock stratum to be studied obtained in advance；
Described matching device forms analog sample for carrying out proportioning according to the described sample composition ratio sample to obtaining in advance, and carries out proportioning according to the described fluid composition ratio reagent to obtaining in advance and form Diagenesis fluids；
Described control device is for controlling according to setting the experiment parameter Petrogenetic Model that shallow embedding, later stage are quickly buried for a long time according to early stage by the described Diagenesis fluids described analog sample of addition, and carries out diagenesis process, obtains at least one sandstone molded samples；
Described process device is used for, and each sandstone molded samples is carried out petrographical analysis test, obtains physical parameter distribution and the diagenesis evolution process of each diagenetic stage in described rock stratum to be studied；Described petrographical analysis test includes a nanometer CT scan three-dimensional reconstruction, focused ion bundle scanning electron microscope mensuration, nitrogen adsorption instrument analysis and high-pressure mercury instrument and measures.
9. system according to claim 8, it is characterised in that described reaction unit includes reacting furnace, hydraulic press and piston pump；Described reacting furnace is connected with static pressure machine and piston pump respectively；
Described reacting furnace is used for holding analog sample, and controls temperature according to described experiment parameter；
Described static pressure machine for controlling pressure according to described experiment parameter in diagenetic process；
Described piston pump for providing fluid and fluid pressure for described analog sample.
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