CN113567319A - Method and device for identifying micro-pore morphology of shale oil and gas reservoir - Google Patents
Method and device for identifying micro-pore morphology of shale oil and gas reservoir Download PDFInfo
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- 238000003795 desorption Methods 0.000 claims abstract description 59
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Abstract
The invention discloses a method and a device for identifying the form of micro pores of a shale oil and gas reservoir, wherein the method comprises the following steps: obtaining an isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption and desorption experiment; matching isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore morphology model to judge the morphology of microscopic pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores; calculating the fractal dimension of the microscopic pores of the shale reservoir based on the isothermal adsorption and desorption curve of the shale reservoir core; analyzing developmental characteristics of the microscopic pores of the shale reservoir based on the fractal dimension of the microscopic pores of the shale reservoir. The invention solves the technical problems that analysis and research on disconnected pores are lacked and the development characteristics of shale pores cannot be quantitatively characterized at present.
Description
Technical Field
The invention relates to the technical field of oil exploration, in particular to a method, a device, equipment and a storage medium for identifying the shape of a micro pore of a shale oil and gas reservoir.
Background
The shale reservoir pore system is a place for directly generating and enriching shale oil and gas and is a shale oil and gas resource storage space. The pore morphology has an important influence on the occurrence and enrichment of shale oil and gas, for example, compared with the ink bottle-shaped pores, the tubular pores with the same volume have larger surface area and higher tortuosity and are easier to adsorb the shale oil and gas.
Shale reservoir pore types are more complicated and various, and the morphological difference of different types of pores is larger, for example, organic matter pores are mostly spherical and ellipsoidal, and interlaminar pores between clay minerals are mostly flat plate slit-shaped, so that the development conditions of different types of pores can be reflected laterally through the analysis of pore morphology, and the research on pore adsorption and seepage capacity is more accurate and deeper. The pore morphology can be divided into connected pores and disconnected pores, and the previous research only explores the connected pores and ignores the analysis research on the disconnected pores. The disconnected pores are extremely unfavorable for occurrence and enrichment of shale oil gas, and the pores cannot become channels of shale oil gas seepage; the connected pores are the main channels for shale oil-gas seepage and escape, and are very critical to the storage and enrichment of oil gas and resource exploitation. In addition, shale has complex and various pore types and structural forms, and cannot be quantitatively characterized at present for analyzing the complexity and heterogeneity of pore development.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a method, a device, equipment and a storage medium for identifying the micro-pore form of a shale oil and gas reservoir, and solves the technical problems that analysis and research on disconnected pores are lacked and the development characteristics of the shale pores cannot be quantitatively represented in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for identifying the form of micro pores of a shale oil and gas reservoir, which comprises the following steps:
obtaining an isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption and desorption experiment;
matching isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore morphology model to judge the morphology of microscopic pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores;
calculating the fractal dimension of the microscopic pores of the shale reservoir based on the isothermal adsorption and desorption curve of the shale reservoir core;
analyzing developmental characteristics of the microscopic pores of the shale reservoir based on the fractal dimension of the microscopic pores of the shale reservoir.
Preferably, in the method for identifying the micro-pore morphology of the shale oil and gas reservoir, the isothermal adsorption and desorption curves of the shale reservoir core are matched based on a preset three-dimensional pore morphology model, so as to determine that the micro-pore morphology of the shale reservoir is specifically:
and matching the magnetic hysteresis loop of the isothermal adsorption and desorption curve of the shale reservoir core with a magnetic hysteresis loop preset in the three-dimensional pore form model, and judging the form of the microscopic pores of the shale reservoir according to the matching result.
Preferably, in the method for identifying the micro-pore morphology of the shale oil and gas reservoir, the three-dimensional pore morphology model comprises at least six hysteresis loops, and the six hysteresis loops are respectively a cylindrical hole hysteresis loop, a flat plate slit-type hole hysteresis loop, a wedge-shaped hole hysteresis loop, a sharp-walled hole hysteresis loop, an ink bottle hole hysteresis loop and a sealing dead hole hysteresis loop.
Preferably, in the method for identifying the form of the micro pores of the shale oil and gas reservoir, the fractal dimension of the micro pores of the shale reservoir calculated based on the isothermal adsorption and desorption curve of the core of the shale reservoir is specifically:
and calculating the fractal dimension of the microscopic pores of the shale reservoir by adopting an FHH model based on the isothermal adsorption-desorption curve of the shale reservoir core.
Preferably, in the identification method of the shale oil and gas reservoir micro-pore morphology, the FHH model specifically comprises:
ln(V/V0)＝A(ln(ln(P0/P))+constant，
A＝D–3，
wherein V is the pore accumulated volume fraction corresponding to the equilibrium pressure P in the nitrogen adsorption and desorption experiment, and V0Is a monolayer adsorption volume, P0For saturation of the adsorption pressure, A is ln (ln (P)0/P)) versus the slope value of the plot obtained for ln (v), constant being a constant for the FHH model.
Preferably, in the method for identifying the micro-pore morphology of the shale oil and gas reservoir, the fractal dimension comprises a first fractal dimension for quantitatively representing the irregularity of the surface structure of the shale pores and a second fractal dimension for quantitatively representing the heterogeneity of the surface structure of the shale pores.
Preferably, in the method for identifying the form of the microscopic pores of the shale oil and gas reservoir, the developmental characteristics of the microscopic pores of the shale reservoir at least comprise the TOC content, the thermal maturity and the mineral composition of the shale.
In a second aspect, the present invention further provides a shale oil and gas reservoir micro-pore morphology recognition apparatus, including:
the curve acquisition module is used for acquiring an isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption and desorption experiment;
the form matching module is used for matching the isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore form model so as to judge the form of the micro pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores;
the fractal dimension calculation module is used for calculating the fractal dimension of the microscopic pores of the shale reservoir based on the isothermal adsorption and desorption curve of the shale reservoir core;
and the development characteristic analysis module is used for analyzing the development characteristics of the micro pores of the shale reservoir based on the fractal dimension of the micro pores of the shale reservoir.
In a third aspect, the present invention further provides a shale oil and gas reservoir micro-pore morphology recognition apparatus, including: a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, implements the steps in the shale hydrocarbon reservoir micro-pore morphology identification method as described above.
In a fourth aspect, the present invention also provides a computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the steps of the method for identifying the micro-pore morphology of a shale hydrocarbon reservoir as described above.
Compared with the prior art, the method, the device, the equipment and the storage medium for identifying the micro-pore morphology of the shale oil and gas reservoir provided by the invention have the advantages that the isothermal adsorption and desorption curve of the shale reservoir core after a nitrogen adsorption experiment is obtained, the isothermal adsorption and desorption curve of the shale reservoir core is matched based on the preset three-dimensional pore model, the micro-pore morphology of the shale reservoir is further judged, the connected pores and the disconnected pores are taken into account, the defect that the disconnected pore analysis is neglected in the prior pore morphology analysis is overcome, meanwhile, the complexity, the heterogeneous degree and the connected characteristics of the pore development are quantified and represented through fractal characteristic analysis, and scientific theoretical support is provided for the adsorption and seepage capability analysis research of a pore system and the reservoir performance evaluation.
Drawings
FIG. 1 is a flow chart of a method for identifying the micro-pore morphology of a shale oil and gas reservoir according to a preferred embodiment of the present invention;
FIG. 2a is a schematic diagram of a preferred embodiment of the isothermal desorption and adsorption curves of the YX1 sample according to the present invention;
FIG. 2b is a schematic diagram of a preferred embodiment of the isothermal desorption and adsorption curves of the YX1 sample of the present invention;
FIG. 2c is a schematic diagram of a preferred embodiment of the isothermal desorption and adsorption curves of the YX1 sample of the present invention;
FIG. 2d is a schematic diagram of a preferred embodiment of the isothermal desorption and adsorption curves of the YX1 sample of the present invention;
FIG. 2e is a schematic diagram of a preferred embodiment of the isothermal desorption and adsorption curves of the YX1 sample according to the present invention;
FIG. 2f is a schematic diagram of a preferred embodiment of the isothermal desorption and adsorption curves of the YX1 sample of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the apparatus for identifying the micro-pore morphology of the shale oil and gas reservoir provided by the present invention;
fig. 4 is a schematic operating environment diagram of the shale hydrocarbon reservoir micro-pore morphology recognition program according to the preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the method for identifying the micro-pore morphology of the shale oil and gas reservoir provided by the embodiment of the invention comprises the following steps:
s100, obtaining an isothermal adsorption and desorption curve of the shale reservoir core after a nitrogen adsorption and desorption experiment;
s200, matching isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore form model to judge the form of the microscopic pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores;
s300, calculating the fractal dimension of the microscopic pores of the shale reservoir based on the isothermal adsorption and desorption curve of the shale reservoir core;
s400, analyzing the development characteristics of the microscopic pores of the shale reservoir based on the fractal dimension of the microscopic pores of the shale reservoir.
In the embodiment, the isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption experiment is obtained, the isothermal adsorption and desorption curve of the shale reservoir core is matched based on the preset three-dimensional pore model, the form of the microscopic pores of the shale reservoir is further judged, the connected pores and the disconnected pores are taken into account, the defect that the disconnected pore analysis is omitted in the previous pore form analysis is overcome, the complexity, the heterogeneous degree and the connected characteristics of the pore development are quantified and represented through fractal characteristic analysis, and scientific theoretical support is provided for the adsorption and seepage capability analysis research of a pore system and the reservoir storage performance evaluation.
In a specific embodiment, the shale reservoir core is collected as a bulk core, and a powder sample is required for carrying out the low-temperature nitrogen adsorption-desorption experiment, so that the powder sample needs to be processed and prepared. The small crushed samples with broken edges can be selected from the powder samples and placed in a sample crusher to be directly crushed, and the sample amount required by the experiment is small and is about 120mg, so that the small crushed samples can be placed in a rock mortar vessel to be ground, and the small crushed samples can be ground to 40-80 meshes. In addition, since the presence of moisture interferes with the adsorption of gas, it is necessary to dehydrate the pulverized sample, which is performed before the actual start of the experiment and without putting it into a dryer, and in the nitrogen adsorption-desorption experimental apparatus, the sample is first placed and tested for gas tightness, then the vacuum treatment is started, and the temperature is set to 383K, and the degassing treatment is performed for about 5 hours to remove adsorbed water and capillary water. Then, the specific surface area analyzer can be started, nitrogen is introduced for adsorption-desorption treatment, the relative pressure change is controlled between 0.01 and 0.995, and the temperature is constantly controlled at 77K.
After the nitrogen adsorption and desorption experiment is completed, the isothermal adsorption and desorption curves of the rock reservoir core can be obtained, as shown in fig. 2a to 2f, which are isothermal adsorption and desorption curves of six different samples (numbered YX1 to YX6), as can be seen from fig. 2, N2The amount of adsorption is dependent on the relative pressure (P/P)0) Is increased at P/P0About 0.4 separates the adsorption and desorption curves due to capillary condensation phenomena, forming a hysteresis loop. Relative pressure (P/P)0<0.5) When the gas adsorption process is carried out, the adsorption curve is slightly concave, and the gas single-layer adsorption process is carried out; at a relative pressure (P/P)00.5), which is the boundary point between single-layer adsorption and multi-layer adsorption of gas, and a relatively obvious inflection point appears when the relative pressure is close to 0.5, so that the adsorption quantity begins to increase; when relative pressure (P/P)0>0.5), the adsorption curve is slightly convex, which indicates that mesopores and macropores exist, and the adsorption quantity rapidly increases along with the increase of relative pressure in a multilayer adsorption process; in addition, the curve rapidly rose at the end of the adsorption curve, and the adsorption did not reach saturation, indicating the presence of macropores and an uneven pore size distribution. Due to the existence of the capillary condensation phenomenon, a desorption curve and an adsorption curve are not completely superposed, a hysteresis loop is generated, and the desorption curve is suddenly reduced when the relative pressure is equal to 0.50, which indicates that the shale has ink bottle-shaped holes with larger pore space; when the relative pressure is less than 0.45, the difference from the adsorption curve is small, and the relative pressure gradually tends to coincide with the adsorption curve. Shale samples N taken from different basins2The hysteresis loops formed by the adsorption-desorption curves have certain differences, which indicate that the pore forms developed in the coal series shale in different regions are different. In addition, in P/P0<N of a portion (e.g. YX4) at 0.42The adsorption-desorption curve is not closed, indicating that a swelling phenomenon exists for this type of sample.
In a preferred embodiment, in the step S200, the matching is performed on the isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore morphology model, so as to determine that the morphology of the micro pores of the shale reservoir is specifically:
and matching the magnetic hysteresis loop of the isothermal adsorption and desorption curve of the shale reservoir core with a magnetic hysteresis loop preset in the three-dimensional pore form model, and judging the form of the microscopic pores of the shale reservoir according to the matching result.
In this embodiment, after the nitrogen gas is filled into the pore system, some gas is adsorbed in the pores and is difficult to be discharged, so that the adsorption curve and the desorption curve do not completely coincide, and the pore shape of the shale reservoir can be changed from N2Adsorption isothermThe hysteresis loop formed. The embodiment of the invention divides the adsorption and desorption isotherms into six types, which correspond to different microscopic pore heart states in the porous medium.
Furthermore, at present, the analysis of the pore morphology is mostly directed to the connectivity pore analysis, and the corresponding relationship formed by the pore morphology and the gas curve hysteresis loop is disordered, the embodiment of the invention takes the unconnected sealed dead holes into consideration, and establishes a three-dimensional pore morphology model to be matched with the hysteresis loop type, so that the pore morphology is divided into six types. Therefore, the three-dimensional pore morphology model comprises at least six hysteresis loops, and the six hysteresis loops are respectively a cylindrical hole hysteresis loop, a flat plate slit-type hole hysteresis loop, a wedge-shaped hole hysteresis loop, a sharp-walled hole hysteresis loop, an ink bottle hole hysteresis loop and a sealed dead hole hysteresis loop. The invention simultaneously takes the connectivity pore and the non-connectivity pore into consideration, makes up the defect of neglecting the analysis of the non-connectivity pore in the prior pore morphology analysis, and establishes a set of relatively complete pore morphology analysis and prediction system.
In a preferred embodiment, the step S300 specifically includes:
and calculating the fractal dimension of the microscopic pores of the shale reservoir by adopting an FHH model based on the isothermal adsorption-desorption curve of the shale reservoir core.
In this embodiment, the fractal dimension D is an important parameter index for quantitatively characterizing the strength and complexity of pore development heterogeneity, and generally, the definition range of the fractal dimension of a three-dimensional space is between 2 and 3, and a value closer to 2 indicates that the pore structure is simpler and the homogeneity is stronger; a closer to 3 indicates a more complex pore structure, a stronger heterogeneity. Wherein the fractal dimensions include a first fractal dimension D1 for quantitatively characterizing irregularities of the shale pore surface structure and a second fractal dimension D2 for quantitatively characterizing the heterogeneity of the shale pore surface structure. Examples of the invention are based on N2Adsorption-desorption data using Frenkel-Halsey-Hill (FH)H) The model calculates the fractal dimension. Specifically, the model specifically includes:
ln(V/V0)＝A(ln(ln(P0/P))+constant，
A＝D–3，
wherein V is the pore accumulated volume fraction corresponding to the equilibrium pressure P in the nitrogen adsorption and desorption experiment, and V0Is a monolayer adsorption volume, P0For saturation of the adsorption pressure, A is ln (ln (P)0/P)) versus the slope value of the plot obtained for ln (v), constant being a constant for the FHH model.
The D-3 model assumes that the radius of curvature of the meniscus of the liquid film is a suitable length for measuring the volume of the liquid film, respectively. Based on nitrogen adsorption data and FHmodel, the nitrogen adsorption data can be in P/P 00 to 0.5 of (1). First fractal dimension D1And a second fractal dimension D2Respectively at P/P0Drawing two different linear sections within the range of 0-0.5 and 0.5-1.0, and drawing the two different linear sections according to the slope value A of the line sections1And A2And (4) measuring.
In a preferred embodiment, in the step S400, the development characteristics of the microscopic pores of the shale reservoir at least include TOC content, thermal maturity and mineral composition of shale.
In particular, the TOC content, thermal maturity and mineral composition of shale can have a significant impact on the fractal dimension. Second fractal dimension D of shale2Is positively correlated with the TOC content. Furthermore, a second fractal dimension D2And also in a slightly positive linear relationship with the thermal maturity Ro. The above results indicate that both organic matter abundance and thermal maturity have a positive effect on fractal dimension. This is because the TOC content dominates the development of pore volume and specific surface area of the micropores in the shale, which ultimately have some effect on the fractal characteristics. In addition, the thermal evolution of organic matter can reduce the stability of the shale internal structure affected by hydrocarbon generation, and the pore surface and structure are more complex and uneven. Clay mineral content and D2In a positive linear relationship because the mobility and layered structure of clay minerals increase the pore surface area, thereby increasing the heterogeneity and complexity of the shale pore structure. Complexity of pore structure with decreasing content of brittle mineralsIncreasing, resulting in an increase in fractal dimension. This is because brittle minerals are closely related to the pore volume of mesopores, which eventually adversely affect the fractal dimension. In addition, the smooth surface of brittle minerals in shale weakens the complexity and heterogeneity of the shale pore structure, thereby reducing the fractal dimension. Thus, overall observations indicate that organic matter and clay abundance and maturity contribute together and have a positive impact on the fractal dimension, while brittle minerals have a negative impact on the fractal dimension.
Therefore, after the fractal dimension is obtained, the development characteristics of microscopic pores of the shale reservoir can be quantitatively analyzed in turn according to the linear relationship between the fractal dimension and the TOC content, the thermal maturity and the mineral composition of the shale, so that the development complexity, the heterogeneous degree and the connectivity characteristics of the pores can be quantitatively represented, and scientific theoretical support is provided for the analysis and research of the adsorption and seepage capacity of a pore system and the evaluation of reservoir storage performance.
Referring to fig. 3, based on the above method for identifying the micro-pore morphology of the shale oil and gas reservoir, an embodiment of the present invention further provides a device 500 for identifying the micro-pore morphology of the shale oil and gas reservoir, which includes:
the curve obtaining module 510 is configured to obtain an isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption and desorption experiment;
the form matching module 520 is used for matching the isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore form model so as to judge the form of the micro pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores;
a fractal dimension calculation module 530, configured to calculate a fractal dimension of a microscopic pore of the shale reservoir based on an isothermal adsorption and desorption curve of the shale reservoir core;
a development characteristic analysis module 540, configured to analyze development characteristics of the micro pores of the shale reservoir based on the fractal dimension of the micro pores of the shale reservoir.
Since the identification method of the microscopic pore morphology of the shale oil and gas reservoir is described in detail above, the detailed description is omitted here.
As shown in fig. 4, based on the above method for identifying the shale oil and gas reservoir micro-pore morphology, the invention further provides a device for identifying the shale oil and gas reservoir micro-pore morphology, wherein the device for identifying the shale oil and gas reservoir micro-pore morphology can be a mobile terminal, a desktop computer, a notebook, a palm computer, a server and other computing devices. The shale oil and gas reservoir micro-pore morphology recognition equipment comprises a processor 10, a memory 20 and a display 30. Fig. 4 shows only some of the components of the shale hydrocarbon reservoir micro-pore morphology recognition apparatus, but it should be understood that not all of the illustrated components are required and that more or fewer components may be implemented instead.
The memory 20 may be an internal storage unit of the shale hydrocarbon reservoir micro-pore morphology recognition device in some embodiments, for example, a hard disk or a memory of the shale hydrocarbon reservoir micro-pore morphology recognition device. In other embodiments, the memory 20 may also be an external storage device of the shale oil and gas reservoir micro-pore morphology recognition device, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), or the like provided on the shale oil and gas reservoir micro-pore morphology recognition device. Further, the memory 20 may also include both an internal storage unit and an external storage device of the shale hydrocarbon reservoir micro-pore morphology recognition device. The memory 20 is used for storing application software installed in the shale oil and gas reservoir micro-pore morphology recognition device and various types of data, such as program codes for installing the shale oil and gas reservoir micro-pore morphology recognition device. The memory 20 may also be used to temporarily store data that has been output or is to be output. In an embodiment, the memory 20 stores a shale hydrocarbon reservoir micro-pore morphology recognition program 40, and the shale hydrocarbon reservoir micro-pore morphology recognition program 40 may be executed by the processor 10, so as to implement the shale hydrocarbon reservoir micro-pore morphology recognition method according to the embodiments of the present application.
The processor 10 may be, in some embodiments, a Central Processing Unit (CPU), a microprocessor or other data Processing chip, and is configured to execute program codes stored in the memory 20 or process data, such as performing the shale hydrocarbon reservoir micro-pore morphology recognition method.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 30 is used for displaying information of the shale oil and gas reservoir micro-pore morphology recognition equipment and displaying a visual user interface. The components 10-30 of the shale oil and gas reservoir micro-pore form recognition equipment are communicated with each other through a system bus.
In one embodiment, the steps of the shale hydrocarbon reservoir micro-pore morphology recognition method described above are implemented when the processor 10 executes the shale hydrocarbon reservoir micro-pore morphology recognition program 40 in the memory 20.
In summary, according to the method, the device, the equipment and the storage medium for identifying the micro-pore morphology of the shale oil and gas reservoir provided by the invention, the isothermal adsorption and desorption curve of the shale reservoir core after a nitrogen adsorption experiment is obtained, the isothermal adsorption and desorption curve of the shale reservoir core is matched based on the preset three-dimensional pore model, the micro-pore morphology of the shale reservoir is further judged, the connected pores and the disconnected pores are taken into account, the defect that the disconnected pore analysis is neglected in the prior pore morphology analysis is overcome, meanwhile, the complexity, the heterogeneous degree and the connected characteristics of the pore development are quantified and represented through fractal characteristic analysis, and scientific theoretical support is provided for the adsorption and seepage capability analysis research of a pore system and the reservoir performance evaluation.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The method for identifying the micro-pore morphology of the shale oil and gas reservoir is characterized by comprising the following steps of:
obtaining an isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption and desorption experiment;
matching isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore morphology model to judge the morphology of microscopic pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores;
calculating the fractal dimension of the microscopic pores of the shale reservoir based on the isothermal adsorption and desorption curve of the shale reservoir core;
analyzing developmental characteristics of the microscopic pores of the shale reservoir based on the fractal dimension of the microscopic pores of the shale reservoir.
2. The shale oil and gas reservoir micro-pore morphology recognition method according to claim 1, wherein the isothermal adsorption and desorption curves of the shale reservoir core are matched based on a preset three-dimensional pore morphology model to judge that the morphology of the micro-pores of the shale reservoir is specifically:
and matching the magnetic hysteresis loop of the isothermal adsorption and desorption curve of the shale reservoir core with a magnetic hysteresis loop preset in the three-dimensional pore form model, and judging the form of the microscopic pores of the shale reservoir according to the matching result.
3. The shale oil and gas reservoir microscopic pore form identification method according to claim 2, wherein the three-dimensional pore form model comprises at least six hysteresis loops, and the six hysteresis loops are respectively a cylindrical hole hysteresis loop, a flat plate slit-type hole hysteresis loop, a wedge-shaped hole hysteresis loop, a sharp-walled hole hysteresis loop, an ink bottle hole hysteresis loop and a sealing dead hole hysteresis loop.
4. The shale oil and gas reservoir micro-pore morphology recognition method according to claim 1, wherein the fractal dimension of the micro-pores of the shale reservoir calculated based on the isothermal adsorption and desorption curve of the shale reservoir core is specifically:
and calculating the fractal dimension of the microscopic pores of the shale reservoir by adopting an FHH model based on the isothermal adsorption-desorption curve of the shale reservoir core.
5. The shale oil and gas reservoir micro-pore morphology recognition method of claim 4, wherein the FHH model is specifically:
ln(V/V0)＝A(ln(ln(P0/P))+constant，
A＝D–3，
wherein V is the pore accumulated volume fraction corresponding to the equilibrium pressure P in the nitrogen adsorption and desorption experiment, and V0Is a monolayer adsorption volume, P0For saturation of the adsorption pressure, A is ln (ln (P)0/P)) versus the slope value of the plot obtained for ln (v), constant being a constant for the FHH model.
6. The shale hydrocarbon reservoir micro-pore morphology identification method of claim 4, wherein the fractal dimension comprises a first fractal dimension for quantitatively characterizing irregularities of a shale pore surface structure and a second fractal dimension for quantitatively characterizing heterogeneity of the shale pore surface structure.
7. The method of identifying the morphology of the microscopic pores of the shale hydrocarbon reservoir as claimed in claim 1, wherein the developmental characteristics of the microscopic pores of the shale reservoir include at least TOC content, thermal maturity, and mineral composition of the shale.
8. The utility model provides a shale oil and gas reservoir microcosmic hole form recognition device which characterized in that includes:
the curve acquisition module is used for acquiring an isothermal adsorption and desorption curve of the shale reservoir core after the nitrogen adsorption and desorption experiment;
the form matching module is used for matching the isothermal adsorption and desorption curves of the shale reservoir core based on a preset three-dimensional pore form model so as to judge the form of the micro pores of the shale reservoir; wherein the morphology of the microscopic pores of the shale reservoir comprises connected pores and unconnected pores;
the fractal dimension calculation module is used for calculating the fractal dimension of the microscopic pores of the shale reservoir based on the isothermal adsorption and desorption curve of the shale reservoir core;
and the development characteristic analysis module is used for analyzing the development characteristics of the micro pores of the shale reservoir based on the fractal dimension of the micro pores of the shale reservoir.
9. The utility model provides a shale hydrocarbon reservoir microcosmic hole form recognition equipment which characterized in that includes: a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, implements the steps of the method for identifying the shape of the micro-pores of the shale oil and gas reservoir as claimed in any one of claims 1 to 7.
10. A computer readable storage medium, storing one or more programs, the one or more programs being executable by one or more processors to perform the steps of the method for shale hydrocarbon reservoir micro-pore morphology recognition as claimed in any one of claims 1 to 7.
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