CN111597670A - Construction method and device of anisotropic digital rock core - Google Patents
Construction method and device of anisotropic digital rock core Download PDFInfo
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Abstract
The invention discloses a method and a device for constructing an anisotropic digital core, wherein the method comprises the following steps: respectively simulating and constructing digital rock cores of a first sedimentary rock and a second sedimentary rock by utilizing a sedimentary process; and stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct the anisotropic digital core, wherein the particle granularity of the first sedimentary rock is different from that of the second sedimentary rock. According to the invention, the digital cores of the first sedimentary rock and the second sedimentary rock with different particle sizes are constructed by utilizing the sedimentation process simulation respectively, and then the digital cores of the first sedimentary rock and the second sedimentary rock are stacked, so that the anisotropic digital core of the sandstone reservoir can be effectively constructed.
Description
Technical Field
The invention relates to the technical field of petroleum exploration, in particular to a method and a device for constructing an anisotropic digital core.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
In oil exploration, a key task of well logging interpretation is to judge whether oil and gas are contained according to the resistivity of sandstone reservoirs. For a long time, it has been assumed in a vertical well horizontal infinite formation that all of its physical properties are symmetrically distributed about the well axis, and the resistivity of the formation measured by the instrument is in the horizontal direction. A target layer with similar lithological properties and a measured resistivity value greater than 3 times that of the adjacent water layer is typically interpreted as a hydrocarbon-bearing layer according to common criteria.
However, as the exploration degree of each large basin is continuously increased, the stratum becomes steeper gradually when approaching the edge of the basin. Sandstone reservoirs tend to exhibit a certain dip angle even in a vertical well, and in extreme cases may exceed 60 ° relative to the dip angle in high steep formation zones, relative to resistivity logging instruments. Because the rock of the sandstone reservoir has the inherent electrical anisotropy (the anisotropy refers to that the chemical or physical properties of a substance change along with the change of the direction and the different properties appear in different directions), the resistivity of the anisotropic sandstone reservoir in the vertical direction is often several times higher than that in the horizontal direction, and the measurement signal of a logging instrument is more influenced by the resistivity of the rock in the vertical direction (consistent with the well axis direction) under the condition that the stratum is relatively inclined, so that the measurement result is larger, and the hydrocarbon reservoir identification of the sandstone reservoir based on the resistivity appears multi-solution.
The main object of current oil and gas exploration is low porosity and even compact sandstone, so the physical property is poor. For the anisotropic sandstone reservoir, in the practical work, it is difficult to ensure that an anisotropic core sample of the sandstone reservoir is obtained. In addition, for anisotropic core samples, the difficulty of conducting resistivity measurements in different directions in a laboratory is also high. Therefore, the construction of the anisotropic digital core and the utilization of the anisotropic digital core to carry out the resistivity numerical simulation analysis of the anisotropic sandstone reservoir are reliable and applicable research means.
At present, the widely adopted technical process for developing digital core resistivity digital analog research at home and abroad is to obtain a digital core by acquiring an image through CT scanning and extracting pores through threshold segmentation, and further develop numerical simulation such as digital core resistivity. However, under the condition that the anisotropic core sample of the sandstone reservoir cannot be obtained, the CT scan cannot be effectively utilized to construct the CT image of the anisotropic real core sample of the sandstone reservoir. In addition, there are methods of constructing digital cores such as an analog annealing method and a process reconstruction method. None of the above methods, however, is effective in constructing anisotropic digital cores for sandstone reservoirs.
Therefore, the existing digital core construction method has the problem that the anisotropic digital core of the sandstone reservoir cannot be effectively constructed.
Disclosure of Invention
The embodiment of the invention provides a method for constructing an anisotropic digital core, which is used for effectively constructing the anisotropic digital core of a sandstone reservoir and comprises the following steps:
respectively simulating and constructing digital rock cores of a first sedimentary rock and a second sedimentary rock by utilizing a sedimentary process; the particle size of the first sedimentary rock is different from the particle size of the second sedimentary rock;
and stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct the anisotropic digital core.
The embodiment of the invention also provides a device for constructing the anisotropic digital core, which is used for effectively constructing the anisotropic digital core of the sandstone reservoir and comprises the following components:
the sedimentary simulation module is used for simulating and constructing digital rock cores of the first sedimentary rock and the second sedimentary rock by using a sedimentary process; the particle size of the first sedimentary rock is different from the particle size of the second sedimentary rock;
and the stacking construction module is used for stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct the anisotropic digital core.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the construction method of the anisotropic digital core when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the above method for constructing an anisotropic digital core is stored in the computer-readable storage medium.
In the embodiment of the invention, the digital cores of the first sedimentary rock and the second sedimentary rock are constructed by utilizing sedimentary process simulation respectively; and stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct the anisotropic digital core, wherein the particle granularity of the first sedimentary rock is different from that of the second sedimentary rock. According to the embodiment of the invention, the digital cores of the first sedimentary rock and the second sedimentary rock with different particle sizes are constructed by utilizing the sedimentation process simulation respectively, and then the digital cores of the first sedimentary rock and the second sedimentary rock are stacked, so that the anisotropic digital core of the sandstone reservoir can be effectively constructed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a flowchart illustrating an implementation of a method for constructing an anisotropic digital core according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating implementation of step 101 in a method for constructing an anisotropic digital core according to an embodiment of the present invention;
fig. 3 is a flowchart of another implementation of step 101 in a method for constructing an anisotropic digital core according to an embodiment of the present invention;
fig. 4 is a flowchart of another implementation of a method for constructing an anisotropic digital core according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating still another implementation of a method for constructing an anisotropic digital core according to an embodiment of the present disclosure;
FIG. 6 is a functional block diagram of an apparatus for constructing an anisotropic digital core according to an embodiment of the present disclosure;
fig. 7 is a functional block diagram of a sedimentation simulation module 601 in the anisotropic digital core construction apparatus according to an embodiment of the present invention;
fig. 8 is another functional block diagram of a sedimentation simulation module 601 in the apparatus for constructing an anisotropic digital core according to an embodiment of the present invention;
FIG. 9 is another functional block diagram of an apparatus for constructing an anisotropic digital core according to an embodiment of the present disclosure;
fig. 10 is a functional block diagram of an apparatus for constructing an anisotropic digital core according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Although the present invention provides the method operation steps or apparatus structures as shown in the following embodiments or figures, more or less operation steps or module units may be included in the method or apparatus based on conventional or non-inventive labor. In the case of steps or structures which do not logically have the necessary cause and effect relationship, the execution order of the steps or the block structure of the apparatus is not limited to the execution order or the block structure shown in the embodiment or the drawings of the present invention. The described methods or modular structures, when applied in an actual device or end product, may be executed sequentially or in parallel according to embodiments or the methods or modular structures shown in the figures.
The applicant of the invention provides a method and a device for constructing an anisotropic digital core, aiming at the defect that the anisotropic digital core of a sandstone reservoir cannot be effectively constructed in the prior art, wherein the method and the device are used for constructing the anisotropic digital core by simulating the digital cores of a first sedimentary rock and a second sedimentary rock respectively by utilizing the sedimentary process, the particle size of the first sedimentary rock is different from that of the second sedimentary rock, and the digital cores of the first sedimentary rock and the second sedimentary rock are stacked, so that the aim of effectively constructing the anisotropic digital core is achieved.
Fig. 1 illustrates an implementation flow of a method for constructing an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are illustrated, and the following details are provided:
as shown in fig. 1, a method for constructing an anisotropic digital core includes:
101, simulating and constructing digital cores of a first sedimentary rock and a second sedimentary rock by using a sedimentary process respectively; the particle size of the first sedimentary rock is different from the particle size of the second sedimentary rock;
and 102, stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct an anisotropic digital core.
And the sedimentation process simulation refers to simulating the sedimentation, compaction and diagenesis processes of the rock by using the spherical particles so as to construct the digital core. The sedimentary process simulation utilizes a descent and rolling algorithm to simulate the sedimentary rock particles to follow the principle of gravitational potential energy minimum under the action of gravity. And then all the particles move downwards along the ordinate to simulate the compaction and particle rearrangement process, and finally simulate diagenetic actions such as secondary increase, corrosion, alternate generation and growth of autogenous clay, so that the pore structure is complicated to be close to the real compact sandstone to the maximum extent. According to the embodiment of the invention, the digital cores of the first sedimentary rock and the second sedimentary rock are constructed by utilizing sedimentary process simulation respectively.
The particle size refers to the size of a particle, and generally, the particle size of a spherical particle is represented by a diameter, the particle size of a cube is represented by a side length, and for an irregular particle, a certain spherical diameter in which the particle behaves in the same manner can be taken as an equivalent diameter of the particle. In the present examples, the particle size of sedimentary rock is referred to. Sedimentary rocks of different grain sizes have different porosities and pore structures and different resistivities, and finally cause different resistivities measured in different directions, namely electrical anisotropy.
Anisotropy refers to a property in which all or part of chemical and physical properties of a substance change with a change in direction and differ from one direction to another. In the embodiment of the invention, the constructed digital core has anisotropy. In order to construct the anisotropic digital core, the grain size of the first sedimentary rock needs to be ensured to be different from the grain size of the second sedimentary rock, so that the anisotropic digital core can be constructed. Therefore, in the embodiment of the present invention, the particle size of the first sedimentary rock and the particle size of the second sedimentary rock are different, so that the pore structures of the first sedimentary rock and the second sedimentary rock are different.
After the digital cores of the first sedimentary rock and the second sedimentary rock are constructed in a simulated mode through the sedimentary process, the constructed digital cores of the first sedimentary rock and the second sedimentary rock are stacked, and therefore the anisotropic digital cores are constructed.
When the first sedimentary rock and the second sedimentary rock are stacked, in an embodiment, after the digital cores of the first sedimentary rock and the second sedimentary rock are respectively constructed, the first sedimentary rock and the second sedimentary rock may be stacked; in one embodiment, after the digital core of the first sedimentary rock is constructed, the digital core simulating the second sedimentary rock is continuously sedimentated on the first sedimentary rock, and then the anisotropic digital core is constructed.
In view of the fact that the spherical particles are stacked according to the principle that gravitational potential energy is the minimum, a larger pore position is formed when the digital core simulating the second sedimentary rock is continuously deposited on the first sedimentary rock, so that the particles on the layer are large in descending displacement, the connection interface of the first sedimentary rock and the second sedimentary rock is uneven and concave-convex, and the connection interface of the finally constructed anisotropic digital core has insufficient connection degree. In order to prevent the situation from occurring and prevent the concave-convex shape of the communication interface from influencing the finally constructed anisotropic digital core, when the digital core of the first sedimentary rock is constructed, a horizontal interface is arranged at the upper part of the digital core of the first sedimentary rock, and when the position of the spherical particle of the first sedimentary rock exceeds the horizontal interface, the spherical particle is removed, so that the upper plane of the digital core of the first sedimentary rock is ensured to be as horizontal as possible, the influence of the concave-convex shape of the upper plane of the digital core of the first sedimentary rock is reduced as far as possible, and the authenticity and the reliability of the anisotropic digital core can be further improved.
In the embodiment of the invention, the digital cores of the first sedimentary rock and the second sedimentary rock with different particle sizes are constructed by utilizing the sedimentary process simulation respectively, and the digital cores of the first sedimentary rock and the second sedimentary rock are stacked, so that the anisotropic digital core can be effectively constructed.
In an embodiment of the present invention, the anisotropic digital core is any one of a cubic digital core, a rectangular digital core, a cylindrical digital core, and a spherical digital core.
The cubic digital core is convenient for calculating the resistivity of the complex hydrocarbon reservoir in different directions by using numerical simulation methods such as finite elements and the like subsequently to obtain the internal relation between the resistivity and the anisotropy coefficient, and the measured resistivity of the anisotropic formation is corrected accordingly, so that the accuracy of hydrocarbon-containing logging interpretation of the complex hydrocarbon reservoir and the calculation accuracy of the saturation are greatly improved.
Fig. 2 illustrates an implementation flow of step 101 in a method for constructing an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are illustrated, and the following details are described below:
in an embodiment of the present invention, in order to improve the authenticity and reliability of the anisotropic digital core, as shown in fig. 2, in step 101 of the construction method of the anisotropic digital core, the digital cores of the first sedimentary rock and the second sedimentary rock are constructed by using sedimentary process simulation respectively; the first sedimentary rock has a different particle size than the second sedimentary rock, including:
The target formation to be simulated is assumed to be interbedded by two sedimentary rock types, namely, first sedimentary rock fine sand and second sedimentary rock clay. The particle size of the first sedimentary rock fine sand is between 0.1mm and 0.25mm, and the particle size of the second sedimentary rock clay is not more than 0.01 mm. Considering that the minimum diameter in a computer memory is 1 pixel, when a digital core of a first sedimentary rock is constructed by using a sedimentary process simulation according to the particle size distribution characteristics of the first sedimentary rock fine sand by taking second sedimentary rock clay with finer particle size as a reference, setting a distribution interval of the particle diameter of the first sedimentary rock fine sand as a first preset diameter interval, and generating M spherical particles with diameters subject to positive-altitude distribution in the range of the first preset diameter interval so as to simulate the sedimentary process of the first sedimentary rock fine sand by using the M spherical particles. After M spherical particles with diameters and sizes subject to normal distribution are obtained, a digital core of the first sedimentary rock fine sand is constructed by utilizing sedimentary process simulation based on the M spherical particles. Wherein M is a positive integer greater than 1.
In one embodiment of the present invention, the distribution interval of the particle diameters of the first sedimentary rock fine sand, i.e., the first predetermined diameter interval, is [40,100] (unit: pixel). It can be understood by those skilled in the art that the first preset diameter interval can be set to other diameter intervals than the above-mentioned [40,100] according to actual needs and specific situations, and the embodiment of the present invention is not particularly limited thereto.
In the embodiment of the invention, M spherical particles with diameters subject to normal distribution are generated in a first preset diameter interval range according to the particle diameter distribution characteristic of the first sedimentary rock, and the digital core of the first sedimentary rock is constructed by utilizing sedimentation process simulation based on the M spherical particles, so that the authenticity and the reliability of the anisotropic digital core can be improved.
Fig. 3 illustrates another implementation flow of step 101 in the method for constructing an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are illustrated, which is detailed as follows:
in an embodiment of the present invention, in order to improve the authenticity and reliability of the anisotropic digital core, as shown in fig. 3, in step 101 of the construction method of the anisotropic digital core, the digital cores of the first sedimentary rock and the second sedimentary rock are constructed by using sedimentary process simulation respectively; the first sedimentary rock has a different particle size than the second sedimentary rock, including:
In an embodiment of the invention, the simulation of the sedimentary process to build the digital core of the second sedimentary rock is similar to the simulation of the process to build the digital core of the first sedimentary rock, i.e. the sedimentary process is used to simulate the process to build the digital core of the first sedimentary rock
According to the particle size distribution characteristics of the second sedimentary rock clay, when a digital core of the second sedimentary rock is constructed by utilizing sedimentary process simulation, the distribution interval of the particle diameters of the second sedimentary rock clay is set as a second preset diameter interval, and N spherical particles with diameters subject to positive and negative distribution are generated within the range of the second preset diameter interval, so that the sedimentary process of the second sedimentary rock clay is simulated by utilizing the N spherical particles. Namely, after N spherical particles with diameters and sizes complying with normal distribution are obtained, a digital core of the second sedimentary rock clay is constructed by utilizing sedimentary process simulation based on the N spherical particles. Wherein N is a positive integer greater than 1.
In the embodiment of the invention, N spherical particles with diameters subject to normal distribution are generated in a second preset diameter interval range according to the particle diameter distribution characteristic of the second sedimentary rock, and the digital core of the second sedimentary rock is constructed by utilizing sedimentation process simulation based on the N spherical particles, so that the authenticity and the reliability of the anisotropic digital core can be improved.
In an embodiment of the invention, a ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is greater than a preset ratio value.
The porosity of the pore surface is the percentage of the visible pore area under a microscope on the rock slice to the total area of an observation visual field. For example, assuming that the total area of the rock slices is a, the total area of the observation field under the microscope is B, and the visible pore area of the rock slices in the observation field is C, the porosity of the pore surface is the area percentage of the visible pore area C to the total area of the observation field B. The porosity of the pore surface in the embodiment of the invention is the porosity of the pore surface of the first sedimentary rock fine sand and the second sedimentary rock clay communicated interface slice.
Total porosity, which is the ratio of the volume of all the pore spaces in a rock sample to the total volume of the rock sample, is referred to as the total porosity of the rock sample. In an embodiment of the present disclosure, the total porosity of the anisotropic digital core refers to a ratio of a volume of all pore spaces of the anisotropic digital core to a total volume of the anisotropic digital core.
When the first sedimentary rock fine sand and the second sedimentary rock clay are stacked, it is required to ensure that the communication interface of the first sedimentary rock fine sand and the second sedimentary rock clay has a sufficient communication degree. The degree of connectivity may be a ratio of the porosity of the pore face of the connectivity interface to the total porosity of the anisotropic digital core. And when the ratio of the porosity of the pore surface of the communication interface of the first sedimentary rock fine sand and the second sedimentary rock clay to the total porosity of the anisotropic digital core is greater than a preset ratio value, the communication interface of the first sedimentary rock fine sand and the second sedimentary rock clay is considered to have sufficient communication degree.
In an embodiment of the present invention, the preset ratio value is a preset ratio value, for example, the preset ratio value may be preset to 20%, the preset ratio value may also be preset to 18%, or 25%, and it is understood by those skilled in the art that the preset ratio value may also be preset to other ratio values besides the above ratio value, for example, the preset ratio value may be preset to 15%, or 22%, which is not limited in the embodiment of the present invention.
Fig. 4 illustrates another implementation flow of the method for constructing an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, which is detailed as follows:
in an embodiment of the present invention, in order to further improve the authenticity and reliability of the anisotropic digital core, as shown in fig. 4, on the basis of the above method steps, the method for constructing the anisotropic digital core further includes:
When the ratio of the porosity of the pore surface of the communication interface of the first sedimentary rock fine sand and the second sedimentary rock clay to the total porosity of the anisotropic digital core is not more than a preset ratio value, it is indicated that the communication interface of the first sedimentary rock fine sand and the second sedimentary rock clay does not have sufficient communication degree, and at the moment, the parameter of sedimentary process simulation can be adjusted to reconstruct the anisotropic digital core until the communication interface of the first sedimentary rock fine sand and the second sedimentary rock clay has sufficient communication degree, namely, until the ratio of the porosity of the pore surface of the communication interface of the first sedimentary rock and the second sedimentary rock clay to the total porosity of the anisotropic digital core is more than the preset ratio value.
In an embodiment of the invention, the parameters of the depositional process simulation may include compaction coefficients and diagenetic synthesis coefficients.
The compaction coefficient refers to a ratio of a dry density actually achieved by compacting the roadbed to a maximum dry density of the sample obtained by a compaction experiment, and in the embodiment of the invention, the compaction coefficient refers to a compaction coefficient when a digital core of first sedimentary rock fine sand is constructed or a compaction coefficient when a digital core of second sedimentary rock clay is constructed.
The diagenesis comprehensive coefficient is a parameter reflecting the influence degree of various diagenesis actions on the original space volume, and comprehensively reflects the influence degree of a reservoir stratum on the porosity space of the reservoir stratum after undergoing various rock evolution histories. The general diagenesis comprehensive coefficient is between 0 and 1. The comprehensive effect of various diagenesis on the change of the reservoir space can be quantitatively represented by diagenesis comprehensive coefficients.
In the embodiment of the invention, when the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is not more than the preset ratio value, the anisotropic digital core is reconstructed by adjusting the deposition process simulation parameters until the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is more than the preset ratio value, so that the authenticity and the reliability of the anisotropic digital core can be further improved.
Fig. 5 illustrates another implementation flow of the method for constructing an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, which is detailed as follows:
in an embodiment of the present invention, in order to further improve the authenticity and reliability of the anisotropic digital core, as shown in fig. 5, on the basis of the above method steps, the method for constructing the anisotropic digital core further includes:
In order to construct the anisotropic digital core containing an included angle and further improve the authenticity and reliability of the anisotropic digital core, the anisotropic digital core is cut according to a cutting instruction to form a new digital core, so that the anisotropic digital core containing any included angle is constructed. And the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core after cutting forms an included angle with the ground plane. The included angle is any included angle between 0 degrees and 90 degrees. In one embodiment of the present invention, the included angle is 45 °.
In the embodiment of the invention, the anisotropic digital core is cut into a new digital core according to the cutting instruction; an included angle is formed between a communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core and the ground plane, the anisotropic digital core containing any included angle is constructed, and the authenticity and the reliability of the anisotropic digital core are further improved.
In an embodiment of the present invention, when the anisotropic digital core and the new digital core are both cube-shaped digital cores, the following are satisfied:
the edge length value of the anisotropic digital core is not less than a first preset edge length value; or
The edge length value of the new digital core is not less than a second preset edge length value; or
The number M of the spherical particles is not less than the ratio of the first preset edge length value to the minimum diameter of the M spherical particles.
In the embodiment of the invention, when the anisotropic digital core constructed through the deposition process simulation is a cube-shaped digital core, the cube-shaped anisotropic digital core is cut according to the cutting instruction to form a new cube-shaped anisotropic digital core, namely a new digital core.
In one embodiment of the present invention, the side length of the anisotropic digital core (cube shape) and the new digital core (cube shape) satisfies:
wherein b represents the side length of the new digital core (cube shape), a represents the side length of the anisotropic digital core (cube shape), and theta represents the included angle formed by the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core and the ground plane.
It will be understood by those skilled in the art that other regular or irregular shaped anisotropic digital cores other than the anisotropic digital cores (cube-shaped) described above may also be cut according to the cutting instructions to form new digital cores (cube-shaped), or other regular or irregular shaped new digital cores other than the new digital cores (cube-shaped), and the specific process is similar to that of the other related embodiments of the present invention, and specific reference is made to the description of the other related embodiments, which will not be described in detail herein.
In order to further improve the authenticity and reliability of the anisotropic digital core and simultaneously improve the processing efficiency of constructing the anisotropic digital core, namely, the authenticity and reliability of the anisotropic digital core are balanced and considered, and the processing efficiency of constructing the anisotropic digital core, the requirements of the process of constructing the anisotropic digital core are as follows:
in an embodiment of the present invention, the first preset side length value is a preset side length value, for example, the first preset side length value may be preset to 3000 pixels, the first preset side length value may be preset to 2800 pixels or 3200 pixels, and it is understood by those skilled in the art that the first preset side length value may also be preset to other side length values besides the above side length value, for example, the first preset side length value may be preset to 2900 pixels or 3100 pixels, which is not limited by the embodiment of the present invention.
In an embodiment of the present invention, the second predetermined edge length value is a predetermined edge length value, for example, the second predetermined edge length value may be preset to 1000 pixels, and the second predetermined edge length value may also be preset to 800 pixels, or 1200 pixels.
In addition, the number M of the spherical particles should not be less than the ratio of the first preset edge length value to the minimum diameter of the M spherical particles.
Namely:
wherein M represents the number of spherical particles of the second sedimentary rock clay, K represents a first predetermined edge length value, SminRepresents the minimum diameter of the M spherical particles.
The embodiment of the invention also provides a device for constructing the anisotropic digital core, which is described in the following embodiment. Because the principle of solving the problems of the devices is similar to the construction method of the anisotropic digital core, the implementation of the devices can be referred to the implementation of the method, and repeated details are not repeated.
Fig. 6 shows functional modules of the anisotropic digital core construction apparatus provided in an embodiment of the present invention, and only parts related to the embodiment of the present invention are shown for convenience of description, and detailed descriptions are as follows:
referring to fig. 6, modules included in the construction of the anisotropic digital core are used to perform steps in the embodiment corresponding to fig. 1, and specific reference is made to fig. 1 and related descriptions in the embodiment corresponding to fig. 1, which are not repeated herein. In the embodiment of the invention, the construction of the anisotropic digital core comprises a sedimentary simulation module 601 and a stacking construction module 602.
The sedimentary simulation module 601 is used for simulating and constructing digital cores of a first sedimentary rock and a second sedimentary rock by using a sedimentary process; the particle size of the first sedimentary rock is different from the particle size of the second sedimentary rock;
a stacking and constructing module 602, configured to stack the digital cores of the first sedimentary rock and the second sedimentary rock to construct an anisotropic digital core.
In the embodiment of the invention, the sedimentary simulation module 601 respectively simulates and constructs digital cores of a first sedimentary rock and a second sedimentary rock by using a sedimentary process; the grain size of the first sedimentary rock is different from the grain size of the second sedimentary rock, and the stacking construction module 602 stacks the digital cores of the first sedimentary rock and the second sedimentary rock, so that the anisotropic digital core can be effectively constructed.
Fig. 7 shows functional modules of a sedimentation simulation module 601 in the construction apparatus for an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
in an embodiment of the present invention, in order to improve the authenticity and reliability of the anisotropic digital core, referring to fig. 7, each module included in a deposition simulation module 601 in the anisotropic digital core building apparatus is used to execute each step in the embodiment corresponding to fig. 2, specifically refer to fig. 2 and the related description in the embodiment corresponding to fig. 2, and are not described herein again. In the embodiment of the invention, the depositional simulation module 601 in the anisotropic digital core construction device comprises a first generation unit 701 and a first depositional simulation unit 702.
A first generating unit 701, configured to generate M spherical particles with diameters and sizes that are subject to normal distribution within a first preset diameter interval according to a particle diameter distribution characteristic of the first sedimentary rock;
a first sedimentary simulation unit 702 for simulating the construction of a digital core of a first sedimentary rock using a sedimentary process based on the M spherical particles.
In the embodiment of the invention, the first generating unit 701 generates M spherical particles with diameters subject to normal distribution in a first preset diameter interval range according to the particle diameter distribution characteristics of the first sedimentary rock, and the first sedimentary simulation unit 702 simulates and constructs the digital core of the first sedimentary rock by using a sedimentary process based on the M spherical particles, so that the authenticity and the reliability of the anisotropic digital core can be improved.
Fig. 8 shows another functional module of a sedimentation simulation module 601 in the construction apparatus for an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the part related to the embodiment of the present invention is shown, and the detailed description is as follows:
in an embodiment of the present invention, in order to improve the authenticity and reliability of the anisotropic digital core, referring to fig. 8, each module included in a deposition simulation module 601 in the anisotropic digital core building apparatus is used to execute each step in the embodiment corresponding to fig. 3, specifically refer to fig. 3 and the related description in the embodiment corresponding to fig. 3, and are not described herein again. In the embodiment of the invention, the sedimentation simulation module 601 in the construction apparatus for the anisotropic digital core comprises a second generation unit 801 and a second sedimentation simulation unit 802.
A second generating unit 801, configured to generate N spherical particles with diameters and sizes that are subject to normal distribution within a second preset diameter interval according to the particle diameter distribution characteristic of the second sedimentary rock;
and a second sedimentary simulation unit 802, configured to simulate and construct a digital core of a second sedimentary rock by using a sedimentary process based on the N spherical particles.
In the embodiment of the present invention, the second generating unit 801 generates N spherical particles with diameters and sizes complying with normal distribution in a second preset diameter interval according to the particle diameter distribution characteristics of the second sedimentary rock, and the second sedimentary simulation unit 802 simulates and constructs a digital core of the second sedimentary rock by using a sedimentary process based on the N spherical particles, so as to improve the authenticity and reliability of the anisotropic digital core.
In an embodiment of the invention, a ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is greater than a preset ratio value.
Fig. 9 illustrates another functional module of the anisotropic digital core construction apparatus provided in the embodiment of the present invention, and only the parts related to the embodiment of the present invention are shown for convenience of description, and the details are as follows:
in an embodiment of the present invention, in order to further improve the authenticity and reliability of the anisotropic digital core, referring to fig. 9, modules included in the anisotropic digital core building apparatus are used to execute steps in the embodiment corresponding to fig. 4, specifically please refer to fig. 4 and the description related to the embodiment corresponding to fig. 4, which is not repeated herein. In the embodiment of the present invention, on the basis of the above module structure, the device for constructing an anisotropic digital core further includes a parameter adjusting module 901.
The parameter adjusting module 901 is configured to, when the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communicating interface to the total porosity of the anisotropic digital core is not greater than the preset ratio, adjust the deposition process simulation parameter to reconstruct the anisotropic digital core until the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communicating interface to the total porosity of the anisotropic digital core is greater than the preset ratio.
In the embodiment of the present invention, when the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is not greater than the preset ratio, the parameter adjustment module 901 adjusts the deposition process simulation parameter to reconstruct the anisotropic digital core until the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is greater than the preset ratio, so as to further improve the authenticity and reliability of the anisotropic digital core.
Fig. 10 shows a further functional block of the apparatus for constructing an anisotropic digital core according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:
in an embodiment of the present invention, in order to further improve the authenticity and reliability of the anisotropic digital core, referring to fig. 10, modules included in the anisotropic digital core building apparatus are used to execute steps in the embodiment corresponding to fig. 5, specifically please refer to fig. 5 and the description related to the embodiment corresponding to fig. 5, which are not repeated herein. In the embodiment of the present invention, on the basis of the above module structure, the device for constructing an anisotropic digital core further includes a cutting module 1001.
A cutting module 1001, configured to cut the anisotropic digital core into a new digital core according to a cutting instruction; and the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core forms an included angle with the ground plane.
In the embodiment of the present invention, the cutting module 1001 cuts the anisotropic digital core into a new digital core according to a cutting instruction; the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core forms an included angle with the ground plane, so that the authenticity and the reliability of the anisotropic digital core can be further improved.
In an embodiment of the present invention, when the anisotropic digital core and the new digital core are both cube-shaped digital cores, the following are satisfied:
the edge length value of the anisotropic digital core is not less than a first preset edge length value; or
The edge length value of the new digital core is not less than a second preset edge length value; or
The number M of the spherical particles is not less than the ratio of the first preset edge length value to the minimum diameter of the M spherical particles.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the construction method of the anisotropic digital core when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the above method for constructing an anisotropic digital core is stored in the computer-readable storage medium.
In summary, in the embodiment of the present invention, the sedimentary processes are respectively utilized to simulate and construct the digital cores of the first sedimentary rock and the second sedimentary rock with different particle sizes, and the digital cores of the first sedimentary rock and the second sedimentary rock are stacked, so that the anisotropic digital core can be effectively constructed. In addition, cutting the anisotropic digital core into a new digital core according to the cutting instruction; the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core forms an included angle with the ground plane, so that the authenticity and the reliability of the anisotropic digital core can be improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. A method for constructing an anisotropic digital core is characterized by comprising the following steps:
respectively simulating and constructing digital rock cores of a first sedimentary rock and a second sedimentary rock by utilizing a sedimentary process; the particle size of the first sedimentary rock is different from the particle size of the second sedimentary rock;
and stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct the anisotropic digital core.
2. The method of claim 1, wherein building digital cores of a first sedimentary rock and a second sedimentary rock using sedimentary process simulations, respectively, comprises:
according to the particle diameter distribution characteristic of the first sedimentary rock, generating M spherical particles with diameters and sizes subject to normal distribution in a first preset diameter interval range;
and based on the M spherical particles, constructing a digital core of the first sedimentary rock by utilizing sedimentary process simulation.
3. The method of claim 1, wherein building digital cores of a first sedimentary rock and a second sedimentary rock using sedimentary process simulations, respectively, comprises:
generating N spherical particles with the diameters and the sizes subject to normal distribution in a second preset diameter interval range according to the particle diameter distribution characteristic of the second sedimentary rock;
and based on the N spherical particles, simulating and constructing a digital core of the second sedimentary rock by using a sedimentary process.
4. The method of claim 1, wherein a ratio of a porosity of a pore surface of the first sedimentary rock and the second sedimentary rock connectivity interface to a total porosity of the anisotropic digital core is greater than a predetermined ratio value.
5. The method of claim 1, further comprising:
and when the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is not more than a preset ratio value, adjusting the sedimentation process simulation parameters to reconstruct the anisotropic digital core until the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is more than the preset ratio value.
6. The method of claim 1, further comprising:
cutting the anisotropic digital core into a new digital core according to a cutting instruction; and the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core forms an included angle with the ground plane.
7. The method of claim 6, wherein when the anisotropic digital core and the new digital core are both cube-shaped digital cores, the following is satisfied:
the edge length value of the anisotropic digital core is not less than a first preset edge length value; or
The edge length value of the new digital core is not less than a second preset edge length value; or
The number M of the spherical particles is not less than the ratio of the first preset edge length value to the minimum diameter of the M spherical particles.
8. An apparatus for building an anisotropic digital core, comprising:
the sedimentary simulation module is used for simulating and constructing digital rock cores of the first sedimentary rock and the second sedimentary rock by using a sedimentary process; the particle size of the first sedimentary rock is different from the particle size of the second sedimentary rock;
and the stacking construction module is used for stacking the digital cores of the first sedimentary rock and the second sedimentary rock to construct the anisotropic digital core.
9. The apparatus of claim 8, wherein the deposition simulation module comprises:
the first generation unit is used for generating M spherical particles with the diameters and the sizes complying with normal distribution in a first preset diameter interval range according to the particle diameter distribution characteristic of the first sedimentary rock;
and the first sedimentary simulation unit is used for simulating and constructing the digital core of the first sedimentary rock by utilizing the sedimentary process based on the M spherical particles.
10. The apparatus of claim 8, wherein the deposition simulation module comprises:
the second generation unit is used for generating N spherical particles with the diameters and the sizes subject to normal distribution in a second preset diameter interval range according to the particle diameter distribution characteristic of the second sedimentary rock;
and the second sedimentary simulation unit is used for simulating and constructing the digital core of the second sedimentary rock by utilizing the sedimentary process based on the N spherical particles.
11. The apparatus of claim 8, wherein a ratio of a porosity surface of the first sedimentary rock and the second sedimentary rock connectivity interface to a total porosity of the anisotropic digital core is greater than a predetermined ratio value.
12. The apparatus of claim 8, further comprising:
and the parameter adjusting module is used for adjusting the deposition process simulation parameters to reconstruct the anisotropic digital core when the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is not more than a preset ratio value until the ratio of the porosity of the pore surface of the first sedimentary rock and the second sedimentary rock communication interface to the total porosity of the anisotropic digital core is more than the preset ratio value.
13. The apparatus of claim 8, further comprising:
the cutting module is used for cutting the anisotropic digital core into a new digital core according to the cutting instruction; and the communication interface of the first sedimentary rock and the second sedimentary rock in the new digital core forms an included angle with the ground plane.
14. The apparatus of claim 13, wherein when the anisotropic digital core and the new digital core are both cube-shaped digital cores, the following is satisfied:
the edge length value of the anisotropic digital core is not less than a first preset edge length value; or
The edge length value of the new digital core is not less than a second preset edge length value; or
The number M of the spherical particles is not less than the ratio of the first preset edge length value to the minimum diameter of the M spherical particles.
15. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 7 when executing the computer program.
16. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 7.
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