CN115097545B - Gypsum identification method for non-primary deposition cause in carbonate reservoir - Google Patents
Gypsum identification method for non-primary deposition cause in carbonate reservoir Download PDFInfo
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 99
- 239000010440 gypsum Substances 0.000 title claims abstract description 99
- 230000008021 deposition Effects 0.000 title claims abstract description 73
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 238000011160 research Methods 0.000 claims description 36
- 239000011435 rock Substances 0.000 claims description 30
- 238000009826 distribution Methods 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 8
- 238000005136 cathodoluminescence Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000012512 characterization method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims 1
- 238000004090 dissolution Methods 0.000 claims 1
- 230000000704 physical effect Effects 0.000 abstract description 6
- 239000010459 dolomite Substances 0.000 description 13
- 229910000514 dolomite Inorganic materials 0.000 description 13
- 230000009471 action Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000005755 formation reaction Methods 0.000 description 9
- 239000004576 sand Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 229910052925 anhydrite Inorganic materials 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000004020 luminiscence type Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 241000203069 Archaea Species 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 206010000349 Acanthosis Diseases 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001364 causal effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
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- 238000001953 recrystallisation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a gypsum identification method of non-primary deposition causes in a carbonate reservoir, which is characterized in that lithology and paleochemical characteristics of a sample are identified through core observation and sheet observation by combining geochemical data, so that a deposition environment is judged, and the occurrence characteristics of gypsum in a stratum and diagenetic environment/fluid are combined to form a gypsum rapid identification method based on the non-primary deposition causes of sedimentary, diagenetic, paleothermal and layer sequence stratum. The method has strong operability and low cost, accords with principles of petrology, stratigraphy and mineralogy, and simultaneously provides technical support for the analysis of the influence of gypsum on reservoir physical properties in the later period.
Description
Technical Field
The invention belongs to the field of geology development of oil and gas fields, and particularly relates to a gypsum identification method for non-primary deposition causes in a carbonate reservoir.
Background
The research on carbonate reservoirs is mainly focused on the aspects of reservoir space, a causal mechanism thereof and the like, while the research on evaporite associated with carbonate rock is relatively less. Gypsum is a kind of evaporite and mainly consists of paste mineral. Since gypsum does not develop very well in carbonate formations in most areas, there is relatively little research on the cause of gypsum development in carbonate reservoirs and its impact on the reservoir.
The research shows that the research on gypsum is mainly focused on the aspects of deposition cause and distribution rule of gypsum deposit, gypsum characteristics and performance of gypsum used for construction and the like, and the detailed research on the mechanism of gypsum cause in carbonate reservoirs and the relation between the mechanism and reservoir development is not carried out by people. In recent years, with research on dolomite-evaporite symbiotic systems, it has been found that dolomite reservoirs formed in a limited-evaporating environment often have evaporite minerals such as gypsum, which can fill pores, block pore throats, reduce reservoir physical properties, and can be dissolved to form important storage and infiltration spaces. Gypsum is one of the evaporites, and exists mainly in the form of paste mass, anhydrite crystals, and the like in dolomite reservoirs.
The scholars at home and abroad develop researches on the cause of gypsum in carbonate reservoirs in different areas from the last 60 th century, and put forward various theories such as salt flat on tide or 'Sabuha' theory, super-salt groundwater precipitation effect, late diagenesis stage 'cement' theory, diagenesis substitution theory and the like. Many factors that generally affect gypsum formation, such as time, evaporation rate, dissolved substances, and continuous replenishment of water, and current research on gypsum cause relies mainly on discussion of the deposition environment, while deposition environment, macro-micro petrography, is an important basis for the gypsum formation mechanism, diagenetic has a very important indicative role for gypsum source and generation sequence. Therefore, the research on the gypsum cause from one aspect of the deposition environment obviously has a certain limitation, and the research is carried out based on the detailed deposition environment, the gypsum development characteristics and the diagenetic effect, so that an effective comprehensive analysis method is formed.
Disclosure of Invention
The invention aims to provide a gypsum identification method for non-primary deposition causes in a carbonate reservoir. The identification method can systematically and comprehensively consider the data of sediments, diagenesis, distribution rules, geochemistry and the like, and rapidly identify gypsum which is not the primary sedimentary cause in the carbonate reservoir.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
The invention provides a gypsum identification method for non-primary deposition causes in a carbonate reservoir, which comprises the following steps:
(1) Mutually calibrating by using core-logging-electrical measurement curves, and establishing a target layer sequence grid by combining regional stratum characteristics;
(2) Selecting a detection sample in the target layer sequence frame, analyzing the deposition environment of the target layer carbonate rock, and then establishing a deposition mode according to the deposition structural characteristics;
(3) In the objective layer sequence frame, analyzing the distribution characteristics of gypsum in the objective layer section to determine the longitudinal and transverse distribution rule of gypsum;
(4) Carrying out sheet identification, paleobiological feature research, cathodoluminescence feature research and isotope feature research on the detection sample, and then carrying out diagenetic effect, diagenetic sequence and paleosalinity analysis in the deposition period;
(5) Identifying non-primary deposited gypsum by utilizing the longitudinal and transverse distribution rule, paleobiological characteristics, diagenetic sequences and paleosalinity characteristics of gypsum;
wherein the step (3) and the step (4) do not distinguish the sequence.
According to the gypsum identification method for the non-primary deposition cause in the carbonate reservoir, lithology and paleochemistry data are comprehensively observed through the core and the sheet, lithology and paleobiological characteristics of a sample are identified, further the deposition environment is judged, and the occurrence characteristics of gypsum in the stratum and the diagenetic environment/fluid are combined, so that the gypsum rapid identification method for the non-primary deposition cause based on the sedimentary, diagenetic, paleobiological and layer sequence stratum is formed. The method has strong operability and low cost, accords with principles of petrology, stratigraphy and mineralogy, and simultaneously provides technical support for the analysis of the influence of gypsum on reservoir physical properties in the later period.
Preferably, the method for establishing the objective layer sequence grid in the step (1) includes the following steps:
(1.1) utilizing core observation and combining lithology characteristics to determine an interval interface;
and (1.2) selecting a characteristic logging curve reflecting an interval interface, dividing an individual well interval, and then carrying out interval comparison to establish an interval lattice frame.
Preferably, the detection sample in step (2) includes any one of rock debris, wall cores or rock cores in the objective layer sequence frame.
Preferably, the method for establishing the deposition mode in step (2) includes the following steps:
(2.1) manufacturing a detection sample into a rock slice, determining main lithology and rock type of the carbonate rock of the target layer, and then analyzing a deposition environment and a deposition phase by combining a deposition background and a deposition structure in the target layer sequence frame;
And (2.2) establishing a logging phase standard in the target layer sequence grid, realizing single well phase division in the full-work area, and establishing a deposition mode.
Preferably, the method for determining the gypsum longitudinal and transverse distribution rule in the step (3) includes the following steps:
(3.1) selecting a typical logging curve for lithology logging fine interpretation according to lithology sections established by the coring wells in the objective layer sequence grid;
(3.2) developing non-coring lithology section interpretation according to the lithology recognition standard of the logging curve calibrated by the core in different small layers and the selected typical logging curve; and then researching the longitudinal and transverse distribution rule of gypsum.
Preferably, the flakes of step (4) identify an occurrence characteristic for the specified gypsum in the rock.
Preferably, the archaea feature study of step (4) is used to specifically detect the type of archaea in the sample.
Preferably, the cathodoluminescence characterization study of step (4) is used to define a diagenetic fluid.
The cathode luminescence characteristic research in the step (4) is to further determine the type of the diagenetic fluid by observing the intensity characteristics of cathode luminescence.
Preferably, the isotope characteristic study in the step (4) is used for assisting in developing a diagenetic environment and diagenetic fluid study.
Preferably, the isotope comprises carbon, oxygen, and strontium.
Preferably, the non-virgin gypsum is filled in a reservoir space such as a karst cave, a ditch, a casting hole, or an inter-granular (dissolving) hole.
Preferably, the non-virgin deposited gypsum is formed at a time later than the time of formation of the etch holes and holes.
The concrete expression of the non-primary sedimentary gypsum provided by the invention in a carbonate reservoir is shown in the following points:
First, gypsum is distributed in the formation in the form of "agglomerates" in the formation;
Secondly, gypsum which is not originally deposited mainly fills storage spaces such as karst cave, karst ditches, casting mould holes, inter-particle (dissolving) holes and the like in the stratum, and the formation time is later than the karst action time;
the microorganisms contained in the stratum corresponding to the third and non-primary sedimentary gypsum mainly exist in a normal salinity environment, and simultaneously, the cathode luminescence and isotope characteristics show that the salinity of the rock environment is relatively normal, and the salinity is insufficient to enable the gypsum to be sedimentary;
fourth, in the longitudinal direction, a formation with non-virgin, sedimentary gypsum is overlaid with normal developing evaporite.
As a preferable technical scheme of the invention, the gypsum identification method for the non-primary deposition cause in the carbonate reservoir comprises the following steps:
(1) Mutually calibrating by using core-logging-electrical measurement curves, and establishing a target layer sequence grid by combining regional stratum characteristics;
(1.1) utilizing core observation and combining lithology characteristics to determine an interval interface;
(1.2) selecting a characteristic logging curve reflecting an interval interface, dividing an individual well interval, and then carrying out interval comparison to establish an interval lattice;
(2) Selecting rock scraps, wall cores or rock cores in the target layer sequence frame, analyzing the deposition environment of the target layer carbonate rock, and then establishing a deposition mode according to deposition structural characteristics;
(2.1) manufacturing a detection sample into a rock slice, determining main lithology and rock type of the carbonate rock of the target layer, and then analyzing a deposition environment and a deposition phase by combining a deposition background and a deposition structure in the target layer sequence frame;
(2.2) establishing a logging phase standard in the target layer sequence grid, realizing single well phase division of a full-work area, and establishing a deposition mode;
(3) In the objective layer sequence frame, analyzing the distribution characteristics of gypsum in the objective layer section to determine the longitudinal and transverse distribution rule of gypsum;
(3.1) selecting a typical logging curve for lithology logging fine interpretation according to lithology sections established by the coring wells in the objective layer sequence grid;
(3.2) developing non-coring lithology section interpretation according to the lithology recognition standard of the logging curve calibrated by the core in different small layers and the selected typical logging curve; then, researching the longitudinal and transverse distribution rule of gypsum;
(4) Carrying out sheet identification, paleobiological feature research, cathodoluminescence feature research and isotope feature research on the detection sample, and then carrying out diagenetic effect, diagenetic sequence and paleosalinity analysis in the deposition period;
(5) Identifying non-primary deposited gypsum by utilizing the longitudinal and transverse distribution rule, paleobiological characteristics, diagenetic sequences and paleosalinity characteristics of gypsum;
wherein the step (3) and the step (4) do not distinguish the sequence.
The numerical ranges recited herein include not only the above-listed point values, but also any point values between the above-listed numerical ranges that are not listed, and are limited in space and for the sake of brevity, the present invention is not intended to be exhaustive of the specific point values that the stated ranges include.
Compared with the prior art, the invention has the following beneficial effects:
(1) The gypsum identification method of the non-primary deposition cause in the carbonate reservoir combines the data of deposition, diagenetic, paleontological, layer sequence stratum and the like, and avoids the limitation caused by researching the gypsum cause from one aspect;
(2) The gypsum identification method for the non-primary deposition cause in the carbonate reservoir not only can rapidly identify the dominant factors influencing the physical property change of various reservoirs, but also can further guide the fine explanation of physical property parameters of the reservoir, and has wide adaptability.
Drawings
FIG. 1 is a flow chart of a method for identifying gypsum that is not the cause of primary deposition in a carbonate reservoir provided in example 1 of the present invention;
FIG. 2 is a lithology section of the formation at the interval of interest provided in example 1 of the present invention;
FIG. 3 is a schematic illustration of the objective interval deposition structure and paleobiological feature provided in example 1 of the present invention;
FIG. 4 is a lithologic fine interpretation contrast profile of a non-cored well for an interval of interest provided in example 1 of the present invention;
Fig. 5 is a diagram of the gypsum characteristics of the core section of the destination layer provided in example 1 of the present invention.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a gypsum identification method for non-primary deposition causes in a carbonate reservoir as shown in fig. 1, the identification method comprising the following steps:
(1) And mutually calibrating by using core-logging-electrical measurement curves, and establishing a target layer sequence frame by combining regional stratum characteristics.
(1.1) In this example, the carbonate reservoir target layer in the research area is the section A of the As group of the progressive-medium new generation, a natural Gamma (GR) curve is selected As a characteristic curve according to core observation, and the deep lateral resistivity and the shallow lateral resistivity curves are combined to identify and divide the sequence interface.
And (1.2) longitudinally dividing the section A into 3 short-term loops (figure 2) according to the natural gamma of the selected characteristic curve and combining the principles of core observation and layer sequence stratigraphy, wherein the bottom interface of each short-term loop corresponds to SQ1, SQ2 and SQ3 respectively from bottom to top, the bottom interface of each short-term loop represents a short sea attack, the characteristic of high value and low value of resistivity corresponding to the natural gamma is shown, and the characteristic of rapid sea attack and slow sea attack is shown in the 3 short-term loops. And on the basis of single well sequence interface division, developing sequence interface division of all wells, and establishing an isochronous stratigraphic framework.
(2) And selecting rock scraps, wall cores or core samples in the target layer sequence frame, analyzing the deposition environment of the target layer carbonate rock, and then establishing a deposition mode according to the deposition structural characteristics.
(2.1) Lithology and rock type were determined by detailed observation of the study area As group a section coring well core and sheet. As shown in fig. 2, the section a of the research area mainly develops dolomite, and is accompanied by gypsum, mudstone, and karst modified karst holes, karst caves, karst furrows, karst breccia and other sedimentary structures on the core (fig. 3). The dolomite of the section a of the research area As can be further subdivided into micrite raw chips Yun Yan, yun Yan and Yun Yan, wherein the sand chips Yun Yan and Yun Yan can be seen under a microscope As a large amount of biological fossil (fig. 3), such As porosities, carpopodium, acanthosis, bivalve, etc., and the biological fossil is mostly kept incomplete due to the influence of the diagenetic effects of recrystallization, dolomite, deglittering, etc., and only a small amount of living beings are kept in a complete or identifiable form.
And (2.2) according to lithology and sediment structural characteristics, comprehensively analyzing to consider that the research area As group A section mainly takes the deposition of a limited land As a main part, and the intermittent exposure of the sediment is caused by the change of the secondary sea level, so that the limited lagoons, the subphases of the land inner bar and a plurality of microphases can be further identified. The stage inner bar mainly develops on the relative micro-relief high land on the limited stage, has stronger energy of water body during deposition, is doubly influenced by tide and wave action, is characterized by developing various granular rocks, and has various granular types, such as sand scraps, oolitic grains, raw scraps and the like. Due to the limited environment, the high-energy beach single rapid of the As group A section has a thin body thickness, and due to the frequent exposure and superposition karst transformation, the original deposition sequence is destroyed. In the vertical cross-sectional structure, a deposition sequence characterized by an upward thickening and an upward lightening develops. The lake is mainly located in a lower-lying area in a limited bench below an average low tide level, water circulation is limited, energy is low, still water deposition is mainly used, and rock types mainly comprise dark gray mudstones, micrite Yun Yan, argillaceous Yun Yan and the like, and small amount of sand scraps and raw scraps can be clamped.
For carbonate rock deposition, natural gamma can well reflect the deposition environment, so a natural gamma curve is selected to establish a well logging phase standard of a research area, single well phase division of a full-work area is realized, and finally a deposition mode is established.
(3) In the objective layer sequence lattice frame, the distribution characteristics of gypsum in the objective layer section are analyzed, and the longitudinal and transverse distribution rule of gypsum is defined.
In the isochrone stratum grillwork divided in the step (1), typical logging curves such As natural gamma, density, deep lateral resistivity, shallow lateral resistivity and the like are selected for the As group A section, interpretation standards are established in a segmented mode, the lithology fine interpretation of the coring well is carried out, and compared with logging and rock core description, so that the lithology interpretation accuracy of the logging is ensured to be more than 90%. And further, carrying out lithology fine interpretation on the non-coring well according to the selected logging curve and the established interpretation standard (figure 4). The method comprises the steps of establishing lithology contrast sections of all wells in a work area, and developing a gypsum longitudinal and transverse spreading rule research, so that the short-term gyratory content of the gypsum of section A of an As group in the research area from SQ3 to SQ1 in the longitudinal direction is gradually reduced, and the gypsum content in a particle beach with relatively higher antique appearance in the transverse direction is more and is in a shape of a block; whereas the gypsum content in the clay Yun Yan, micrite Yun Yan in the lagoons, which are relatively low lying, is relatively low.
(4) And carrying out sheet identification, paleobiological feature research, cathodoluminescence feature research and isotope feature research on the detection sample, and then carrying out diagenetic effect, diagenetic sequence and paleosalinity analysis in the deposition period.
Core and under-lens sheet observations show that the diagenetic effect of section A of the As group in the research area mainly has the functions of dolomite petrochemical effect, cementing effect, corrosion effect and structural fracture effect, while other diagenetic effect types are relatively rare.
The A section of the research area As group is mainly dolomite, and carbon and oxygen isotopes of the dolomite sample reflect that the carbonate rock is sea-phase carbonate rock with relatively high salinity; the 87Sr/86 Sr value of the sample is consistent with the synchronous seawater value, which shows that dolomite is not obviously affected by the action of the atmospheric fresh water; microorganisms rich in As groups all live in a normal salinity environment; the dolomite sample has orange-yellow to orange color, relatively strong luminescence, and comprehensive analysis shows that the dolomite causes are in a permeation reflux dolomite petrochemical mode.
The former study shows that the As group deposition period is affected by the lifting and continuous sea-going back of Alps construction movement, and the exposed unconformity surface is relatively developed. The karst breccia on the core below the exposed unconformity surface of the As group A section of the research area is developed, wherein the karst breccia is mainly filled in the cavity, the breccia consists of raw scraps Yun Yan, and the breccia is filled by mixing mud and gypsum. In addition, a development ditch, a solution slit and a small horizontal karst cave below the non-integrated surface are exposed. These furrows, seams and caverns are an important identifying feature of the As group suffering from karst action, most often filled or semi-filled with karst breccia, dissociated carbonate rock sand, anhydrite, land-based debris, etc.
It was further observed that the study area As group developed a large amount of gypsum cement in the inter-granular (solution) pores, casting mold pores, in addition to the calcite cement, wherein most of the cement was in the form of "agglomerates" in the form of green chips Yun Yan, sand chips Yun Yan and small amounts of mud powder crystals Yun Yan, in an oval, lenticular, spherical, randomly distributed, and microscopic observation showed that the gypsum cement was filled with large pores, while retaining small pores, with an important effect on reservoir porosity (fig. 5).
The development of the cracks is mainly influenced by the structural movement, the generated cracks are used As channels for groundwater seepage on one hand, the progress of karst action is promoted, and on the other hand, the karst action can further erode and expand the cracks formed at early stage, so that the storage space is increased.
By combining the above actions on diagenetic, the sequence of main diagenetic actions of the As group A section of reservoir in the research area is cleared. Firstly, the quasi-syngeneic stage As group A section is subjected to permeation reflux dolomite petrochemical action; secondly, exposing and eroding the beach body in a low-level system domain to form a karst system; then, the anhydrite fills the early-stage erosion holes and wraps the seepage powder sand; finally, the development of cracks is affected by the structuring.
(5) And identifying the gypsum deposited in a non-primary way by utilizing the longitudinal and transverse distribution rule, paleobiological characteristics, diagenetic sequences and paleosalinity characteristics of the gypsum.
Gypsum is mainly distributed in a 'block shape' in an A section of an As group in a research area, relatively develops on a relatively high particle beach of ancient landforms transversely, and gradually decreases downwards from the top of the A section longitudinally; the paleons show that the seawater in the deposition period is of normal salinity (less than 70%o), while the precipitation of anhydrite requires brine with salinity exceeding 200%o; the diagenetic sequence shows that gypsum fills after karst action occurs, mainly filling large erosion holes, while small erosion holes remain; the As group is thick-layer gypsum, and the distribution range in the transverse direction is wide. By combining the above, gypsum in the As group A section reservoir is considered to be non-primary deposition, and heavy brine is concentrated by later evaporation and submerged in the earlier karst system, so that the karst formed corrosion holes are filled.
In summary, the gypsum identification method for the non-primary deposition cause in the carbonate reservoir provided by the invention is characterized in that the lithology and the paleochemistry data are synthesized through core observation and sheet observation, the lithology and the paleobiology characteristics of the sample are identified, the deposition environment is further judged, and the occurrence characteristics of gypsum in the stratum and the diagenetic environment/fluid are combined, so that the gypsum rapid identification method based on the non-primary deposition cause of the sedimentary, diagenetic, paleobiology and layer sequence stratum is formed. The method has strong operability and low cost, accords with principles of petrology, stratigraphy and mineralogy, and simultaneously provides technical support for the analysis of the influence of gypsum on reservoir physical properties in the later period.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (12)
1. A method of identifying gypsum that is not a primary deposit cause in a carbonate reservoir, the method comprising the steps of:
(1) Mutually calibrating by using core-logging-electrical measurement curves, and establishing a target layer sequence grid by combining regional stratum characteristics;
(2) Selecting a detection sample in the target layer sequence frame, analyzing the deposition environment of the target layer carbonate rock, and then establishing a deposition mode according to the deposition structural characteristics;
(3) In the objective layer sequence frame, analyzing the distribution characteristics of gypsum in the objective layer section to determine the longitudinal and transverse distribution rule of gypsum;
(4) Carrying out sheet identification, paleobiological feature research, cathodoluminescence feature research and isotope feature research on the detection sample, and then carrying out diagenetic effect, diagenetic sequence and paleosalinity analysis in the deposition period;
(5) Identifying non-primary deposited gypsum by utilizing the longitudinal and transverse distribution rule, paleobiological characteristics, diagenetic sequences and paleosalinity characteristics of gypsum;
wherein the step (3) and the step (4) do not distinguish the sequence.
2. The method for identifying gypsum that is not the cause of primary deposition in a carbonate reservoir according to claim 1, wherein the method for creating the layer sequence grid of interest in step (1) comprises the steps of:
(1.1) utilizing core observation and combining lithology characteristics to determine an interval interface;
And (1.2) selecting a characteristic logging curve reflecting an interval interface, dividing an individual well interval, and then carrying out interval comparison to establish an interval lattice frame.
3. The method of gypsum identification of non-primary deposit causes in a carbonate reservoir according to claim 1 or 2, wherein the test sample of step (2) comprises any one of cuttings, wall centers or core within a layer sequence of interest.
4. The method for identifying gypsum that is not a primary deposition cause in a carbonate reservoir according to claim 1, wherein the method for establishing the deposition pattern of step (2) comprises the steps of:
(2.1) manufacturing a detection sample into a rock slice, determining main lithology and rock type of the carbonate rock of the target layer, and then analyzing a deposition environment and a deposition phase by combining a deposition background and a deposition structure in the target layer sequence frame;
and (2.2) establishing a logging phase standard in the target layer sequence grid, realizing single well phase division in the full-work area, and establishing a deposition mode.
5. The method for identifying gypsum that is not the cause of primary deposition in a carbonate reservoir according to claim 1, wherein the method for determining the gypsum longitudinal and lateral distribution law in step (3) comprises the steps of:
(3.1) selecting a typical logging curve for lithology logging fine interpretation according to lithology sections established by the coring wells in the objective layer sequence grid;
(3.2) developing non-coring lithology section interpretation according to the lithology recognition standard of the logging curve calibrated by the core in different small layers and the selected typical logging curve; and then researching the longitudinal and transverse distribution rule of gypsum.
6. The method of gypsum identification of non-primary deposit causes in carbonate reservoirs according to claim 1, wherein the sheet of step (4) identifies an occurrence characteristic for defining gypsum in the rock.
7. The method of gypsum identification of non-primary deposit causes in carbonate reservoirs according to claim 1, wherein the archaeal feature study of step (4) is used to unequivocally detect archaeal types in samples.
8. The method of gypsum identification of non-primary deposit causes in carbonate reservoirs according to claim 1, wherein the cathodoluminescent signature study of step (4) is used to define diagenetic fluids.
9. The method of gypsum identification of non-primary deposit causes in carbonate reservoirs according to claim 1, wherein the isotope characterization study of step (4) is used to aid in developing a diagenetic environment and diagenetic fluid study.
10. The method of gypsum identification of non-primary deposit causes in carbonate reservoirs according to claim 9, wherein isotopes used in the isotope characterization study of step (4) include carbon, oxygen, and strontium.
11. The method of gypsum identification of non-primary depositional causes in carbonate reservoirs of claim 1, wherein the non-primary deposited gypsum fills in the cave, the solution drain, the casting mold hole, the inter-granular pores, and the reservoir space of the inter-granular pores.
12. The method of gypsum identification of non-primary deposit causes in a carbonate reservoir according to claim 1, wherein the non-primary deposit gypsum is formed later in time than the dissolution holes and holes.
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