CN114280272A - Coal rock physical parameter analysis method, system and electronic equipment - Google Patents
Coal rock physical parameter analysis method, system and electronic equipment Download PDFInfo
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- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 22
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- 239000000470 constituent Substances 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
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Abstract
The invention provides a method, a device and a system for analyzing physical parameters of coal rock, wherein the method comprises the following steps: obtaining a rock sample of a target coal field mining area; testing the rock sample to obtain lithology physical property parameters of the rock sample; the lithology property parameter includes at least one of: rock porosity, rock velocity, rock sample density, basic lithology physical property parameters of rock sample mineral components; substituting the lithology physical property parameters into a preset rock physical model, and calculating to obtain the matrix modulus of the rock sample; and analyzing the relation between the lithologic physical property parameters based on the matrix modulus of the rock sample and a Chapman model. The method is based on the Chapman model to analyze the relationship between different lithology physical property parameters of the rock sample, can more accurately obtain the relationship and the influence between the different lithology physical property parameters, can search a basic theoretical basis for a common empirical formula, and improves the precision of the test result of the lithology physical property parameters.
Description
Technical Field
The invention relates to the technical field of rock physical parameters, in particular to a coal rock physical parameter analysis method, a coal rock physical parameter analysis system and electronic equipment.
Background
In the field of coal, research on the influence of various rock physical parameters on the rock sample speed does not have a perfect support basis at home and abroad. The method is generally applied to research the influence of various physical parameters on the rock sample speed by using a self-compatible model, a differential equivalent medium model, an xu-white model and the like, and analysis parameters such as some empirical formulas and the like and the mutual influence relationship between the speed. The models can research the relationship between partial rock physical parameters and rock speed, but due to the limitation of experimental conditions, the real form of an underground rock sample is difficult to accurately simulate, or due to the poor control of the experimental conditions, larger errors of the lithology parameter test results occur.
Disclosure of Invention
The invention solves the problem that the existing rock physical parameter analysis method has larger error of the lithology physical property parameter test result.
In order to solve the above problems, the present invention provides a method for analyzing physical parameters of coal rock, comprising: obtaining a rock sample of a target coal field mining area; testing the rock sample to obtain lithology physical property parameters of the rock sample; the lithology property parameter includes at least one of: rock porosity, rock velocity, rock sample density, basic lithology physical property parameters of rock sample mineral components; substituting the lithology physical property parameters into a preset rock physical model, and calculating to obtain a matrix modulus of the rock sample; and analyzing the relation between the lithologic physical property parameters based on the matrix modulus of the rock sample and a Chapman model.
Optionally, the preset petrophysical model comprises any one of: a self-consistent model, a differential equivalent model and an xu-white model.
Optionally, substituting the lithology property parameters into a preset petrophysical model, and calculating to obtain a matrix modulus of the rock sample, including: and substituting the basic elastic parameters of the constituent minerals of the rock sample and the volume fractions of the constituent minerals into a self-consistent model, and performing iterative computation to obtain the elastic modulus of the rock matrix.
Optionally, the analyzing the relationship between the lithology parameters based on the matrix modulus of the rock sample and a Chapman model comprises: inputting the matrix modulus of the rock sample into a Chapman model, and calculating to obtain a rigidity matrix tensor of the rock sample; calculating the influence of the first parameter on the second parameter according to the stiffness matrix tensor; the first parameter and the second parameter are different parameters in the lithology physical property parameters.
Optionally, the obtaining a rock sample of the target coal field mining area includes: drilling a coal sample in a target coal field mining area to obtain an initial coal sample; and performing coal sample cutting and end surface polishing treatment on the initial coal sample to obtain a rock sample.
Optionally, the testing the rock sample to obtain the lithology physical property parameter of the rock sample includes: measuring the rock porosity of the rock sample by using a rock porosity tester; measuring the rock speed of the rock sample by using a rock ultrasonic tester; calculating the rock sample density of the rock sample according to the volume and the mass of the rock sample; and obtaining basic lithology physical property parameters of rock sample mineral components of the rock sample by using a look-up table.
The invention provides a coal rock physical parameter analysis system, which comprises: the acquisition module is used for acquiring a rock sample of a target coal field mining area; the testing module is used for testing the rock sample to obtain lithology physical property parameters of the rock sample; the lithology property parameter includes at least one of: rock porosity, rock velocity, rock sample density, rock sample mineral composition; the calculation module is used for substituting the lithology physical property parameters into a preset rock physical model to calculate and obtain the matrix modulus of the rock sample; and the analysis module is used for analyzing the relation between the lithology physical property parameters based on the matrix modulus of the rock sample and a Chapman model.
Optionally, the analysis module is specifically configured to: inputting the matrix modulus of the rock sample into a Chapman model, and calculating to obtain a rigidity matrix tensor of the rock sample; calculating the influence of the first parameter on the second parameter according to the stiffness matrix tensor; the first parameter and the second parameter are different parameters in the lithology physical property parameters.
The invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method when executing the computer program.
The present invention provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the above-described method.
The embodiment of the invention provides a method, a system and electronic equipment for analyzing physical parameters of coal rock and rock, which are used for analyzing the relationship between different lithologic property parameters of a rock sample based on a Chapman model, can more accurately obtain the relationship and the influence between the different lithologic property parameters, can search a basic theoretical basis for a common empirical formula, and improve the precision of a test result of the lithologic property parameters.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for analyzing physical parameters of coal rocks according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a graph illustrating the influence of porosity on rock velocity according to an embodiment of the present invention;
FIG. 3 is a fracture/fracture aspect ratio versus seismic wave attenuation curve provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a coal rock physical parameter analysis system according to an embodiment of the present invention.
Description of reference numerals:
401-an acquisition module; 402-a test module; 403-a calculation module; 404-analysis module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic flow chart of a method for analyzing physical parameters of coal rocks according to an embodiment of the present invention, where the method includes the following steps:
and S102, obtaining a rock sample of the mining area of the target coal field.
After the target coal field mining area is determined, coal sample drilling can be carried out on the target coal field mining area to obtain an initial coal sample, and then coal sample cutting and end face polishing treatment are carried out on the initial coal sample to obtain a rock sample.
For example, firstly, rock sample collection is carried out on a target coal field mining area through a rock physical sampling method in the general regulation of sampling for measuring the coal and rock physical mechanical properties to obtain a rock sample, and then pretreatment such as cutting, polishing, numbering and the like of an original rock sample is carried out according to the requirements in the GB/T16773-2008 coal rock analysis sample preparation method.
In the process of coal field mining, rock sample specimens such as rock cores and the like can be obtained by means of logging and the like, and according to rock sample processing standards and requirements, after original specimens are obtained, basic specimen processing is required to be carried out, so that the original specimens become usable rock sample specimens, and the method comprises the following steps:
(1) drilling a coal sample: samples without significant fissures were selected for drilling of experimental coal samples.
(2) Cutting a coal sample; and cutting the drilled coal sample, and ensuring that the length of the coal sample is as long as possible in the cutting process, so that the coal sample polished later can meet the length requirement.
(3) End face grinding: and (3) polishing the end face of the cut coal sample, and paying attention to the diameter and the length of the polished coal sample at any time in the polishing process. Finally, the coal sample with flat end face, which meets the requirements of diameter and length, is obtained, namely the rock sample.
(4) Numbering the coal samples: and (4) uniformly numbering the coal samples obtained after drilling, cutting and grinding, and carrying out primary observation on the coal samples.
And S104, testing the rock sample to obtain the lithology physical property parameters of the rock sample.
The lithology physical property parameters comprise: the method comprises the steps of obtaining basic lithology parameters of coal rock basic components by utilizing the coal rock industrial component analysis technology and looking up a table to obtain the basic lithology parameters of each component.
Specifically, the testing of the rock sample comprises the following modes: measuring the rock porosity of the rock sample by using a rock porosity tester; measuring the rock speed of the rock sample by using a rock ultrasonic tester; calculating the rock sample density of the rock sample according to the volume and the mass of the rock sample; obtaining basic lithology physical property parameters of rock sample mineral components of the rock sample by using a table look-up; other lithologic physical parameters such as volume, permeability, water saturation and the like can be obtained by laboratory measurement and calculation.
And S106, substituting the lithology physical property parameters into a preset rock physical model, and calculating to obtain the matrix modulus of the rock sample.
Wherein the preset petrophysical model comprises any one of the following: a self-consistent model, a differential equivalent model and an xu-white model. The rock sample matrix modulus includes the elastic modulus of the rock matrix. Taking a self-consistent model as an example, the matrix modulus of a rock sample can be calculated as follows: and substituting the basic elastic parameters of the constituent minerals and the volume fractions of the constituent minerals of the rock sample into the self-consistent model, and performing iterative computation to obtain the elastic modulus of the rock matrix.
And S108, analyzing the relation between the lithology physical property parameters based on the matrix modulus of the rock sample and a Chapman model.
Specifically, the matrix modulus of the rock sample can be input into a Chapman model, a stiffness matrix tensor of the rock sample is obtained through calculation, and then the influence of the first parameter on the second parameter is calculated according to the stiffness matrix tensor. The first parameter and the second parameter are different parameters in lithology physical property parameters.
The embodiment of the invention provides a coal rock physical parameter analysis method, which is used for analyzing the relationship between different lithologic property parameters of a rock sample based on a Chapman model, can more accurately obtain the relationship and the influence between the different lithologic property parameters, can search a basic theoretical basis for a common empirical formula, and improves the precision of a lithologic property parameter test result.
The following example illustrates the analysis of the influence of lithology parameters on rock velocity based on the tensor stiffness matrix.
Illustratively, the sc-Chapman model is established to analyze the influence of lithology and physical property parameters on speed and the basic relation between the lithology and physical property parameters based on the rock physical model proposed by Chapman et al in 2002, namely, the Chapman model, and combined with the self-compatibility model proposed by hill et al in 1965, namely, the self-consistency model.
The self-consistent model is shown in the following formula, and the elastic modulus of the rock matrix is calculated in an iterative manner through a self-consistent theory by continuously substituting the measured basic elastic parameters of the constituent minerals and the volume fractions of the minerals into the formula
And
and takes it as the subsequent basic input parameter.
Wherein P, Q is the basic shape parameter of the pore, Ki、μiIs the basic elastic parameter of the component, viN is the number of the components.
P, Q has definite calculation formula, and only needs to continuously input basic elastic parameters such as K of different components in the process of applying self-compatible modeliAnd muiAnd content v thereofiThe elastic modulus of the rock matrix can be obtained through iterative calculation
Obtaining the elastic modulus of the rock matrix based on the calculation
Substituting the obtained lithologic and physical parameters with other lithologic and physical parameters of the tested rock sample into a Chapman model, and calculating to obtain energyAnd a rigidity matrix tensor representing the physical properties of the rock sample, and the influence of different lithology physical property parameters on the rock speed can be calculated and obtained on the basis of the tensor.
Chapman model is as follows:
wherein:
M＝[(C11-C44)sin2θ-(C33-C44)cos2θ]2+(C13+C44)2sin22θ
in the formula (I), the compound is shown in the specification,
the elasticity tensor of the homogeneous medium independent of frequency, namely the elasticity tensor of the rock matrix is represented; phi is apIs the degree of porosity of the porous medium,
correcting the elasticity tensor for the respective; epsiloncIs the fracture density of the medium,
correcting the elasticity tensor for the respective; epsilonfIs the density of the cracks and is,
for the corresponding correction of the elasticity tensor, λ0、μ0Is the Lame constant of the mineral particles of the medium, rho is the rock density, tau is the relaxation time (relaxation time), omega is the angular frequency, vpIs the velocity of longitudinal wave, vsV、vsHIs the shear wave velocity.
The effect of the lithology parameters on rock velocity can then be calculated based on the stiffness matrix tensor. For example, fig. 2 shows a schematic diagram of an influence curve of porosity on rock velocity, in fig. 2, the horizontal axis represents porosity, the vertical axis represents rock velocity, and the three curves are fast longitudinal wave velocity, slow longitudinal wave velocity and transverse wave velocity in sequence from top to bottom.
Alternatively, in view of the fineness of the chapman model for analyzing a large number of rock physical parameters, mainly referring to pore fluid density, water saturation, fluid velocity, fracture-to-fracture aspect ratio, fluid modulus, mineral particle size, fluid viscosity, rock permeability, sound wave incidence frequency and the like, the analysis of the correlation between the parameters can be performed.
For example, fig. 3 shows a fracture/fracture aspect ratio versus seismic wave attenuation, in fig. 3, the horizontal axis represents the fracture/fracture aspect ratio, the vertical axis represents the seismic wave velocity, and the curves in the graph sequentially represent the fracture aspect ratio versus seismic wave attenuation curve/fracture aspect ratio versus seismic wave attenuation from top to bottom.
Fig. 4 is a schematic structural diagram of a coal petrophysical parameter analysis system according to an embodiment of the present invention, where the system includes:
the obtaining module 401 is configured to obtain a rock sample of a target coal field mining area;
the testing module 402 is configured to test the rock sample to obtain lithology physical property parameters of the rock sample; the lithology property parameter includes at least one of: rock porosity, rock velocity, rock sample density, rock sample mineral composition;
the calculation module 403 is configured to substitute the lithology physical property parameter into a preset petrophysical model, and calculate to obtain a matrix modulus of the rock sample;
an analysis module 404, configured to analyze a relationship between the lithology parameters based on the matrix modulus of the rock sample and a Chapman model.
The embodiment of the invention provides a coal rock physical parameter analysis system, which is used for analyzing the relationship between different lithologic property parameters of a rock sample based on a Chapman model, can more accurately obtain the relationship and the influence between the different lithologic property parameters, can search a basic theoretical basis for a common empirical formula, and improves the precision of a lithologic property parameter test result.
Optionally, as an embodiment, the analysis module 404 is specifically configured to: inputting the matrix modulus of the rock sample into a Chapman model, and calculating to obtain a rigidity matrix tensor of the rock sample; calculating the influence of the first parameter on the second parameter according to the stiffness matrix tensor; the first parameter and the second parameter are different parameters in the lithology physical property parameters.
Optionally, as an embodiment, the preset petrophysical model includes any one of: a self-consistent model, a differential equivalent model and an xu-white model.
Optionally, as an embodiment, the calculating module 403 is specifically configured to: and substituting the basic elastic parameters of the constituent minerals of the rock sample and the volume fractions of the constituent minerals into a self-consistent model, and performing iterative computation to obtain the elastic modulus of the rock matrix.
Optionally, as an embodiment, the obtaining module 401 is specifically configured to: drilling a coal sample in a target coal field mining area to obtain an initial coal sample; and performing coal sample cutting and end surface polishing treatment on the initial coal sample to obtain a rock sample.
Optionally, as an embodiment, the test module 402 is specifically configured to: measuring the rock porosity of the rock sample by using a rock porosity tester; measuring the rock speed of the rock sample by using a rock ultrasonic tester; calculating the rock sample density of the rock sample according to the volume and the mass of the rock sample; and obtaining basic lithology physical property parameters of rock sample mineral components of the rock sample by using a look-up table.
The invention provides electronic 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 executes the computer program to realize the steps of the coal rock physical parameter analysis method.
The invention provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is read and executed by a processor, the method for analyzing the physical parameters of the coal rock and the rock is realized.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A coal petrophysical parameter analysis method is characterized by comprising the following steps:
obtaining a rock sample of a target coal field mining area;
testing the rock sample to obtain lithology physical property parameters of the rock sample; the lithology property parameter includes at least one of: rock porosity, rock velocity, rock sample density, basic lithology physical property parameters of rock sample mineral components;
substituting the lithology physical property parameters into a preset rock physical model, and calculating to obtain a matrix modulus of the rock sample;
and analyzing the relation between the lithologic physical property parameters based on the matrix modulus of the rock sample and a Chapman model.
2. The method of claim 1, wherein the pre-set petrophysical model comprises any one of: a self-consistent model, a differential equivalent model and an xu-white model.
3. The method of claim 2, wherein the step of substituting the lithology parameters into a preset petrophysical model to calculate the matrix modulus of the rock sample comprises:
and substituting the basic elastic parameters of the constituent minerals of the rock sample and the volume fractions of the constituent minerals into a self-consistent model, and performing iterative computation to obtain the elastic modulus of the rock matrix.
4. The method of claim 1, wherein analyzing the relationship between the lithology parameters based on the matrix modulus of the rock sample and a Chapman model comprises:
inputting the matrix modulus of the rock sample into a Chapman model, and calculating to obtain a rigidity matrix tensor of the rock sample;
calculating the influence of the first parameter on the second parameter according to the stiffness matrix tensor; the first parameter and the second parameter are different parameters in the lithology physical property parameters.
5. The method of claim 1, wherein obtaining a rock sample of the target coal field mine comprises:
drilling a coal sample in a target coal field mining area to obtain an initial coal sample;
and performing coal sample cutting and end surface polishing treatment on the initial coal sample to obtain a rock sample.
6. The method of claim 1, wherein the testing the rock sample to obtain lithology parameters of the rock sample comprises:
measuring the rock porosity of the rock sample by using a rock porosity tester;
measuring the rock speed of the rock sample by using a rock ultrasonic tester;
calculating the rock sample density of the rock sample according to the volume and the mass of the rock sample;
and obtaining basic lithology physical property parameters of rock sample mineral components of the rock sample by using a look-up table.
7. A coal petrophysical parameter analysis system, the system comprising:
the acquisition module is used for acquiring a rock sample of a target coal field mining area;
the testing module is used for testing the rock sample to obtain lithology physical property parameters of the rock sample; the lithology property parameter includes at least one of: rock porosity, rock velocity, rock sample density, rock sample mineral composition;
the calculation module is used for substituting the lithology physical property parameters into a preset rock physical model to calculate and obtain the matrix modulus of the rock sample;
and the analysis module is used for analyzing the relation between the lithology physical property parameters based on the matrix modulus of the rock sample and a Chapman model.
8. The system of claim 7, wherein the analysis module is specifically configured to:
inputting the matrix modulus of the rock sample into a Chapman model, and calculating to obtain a rigidity matrix tensor of the rock sample;
calculating the influence of the first parameter on the second parameter according to the stiffness matrix tensor; the first parameter and the second parameter are different parameters in the lithology physical property parameters.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of the preceding claims 1-6 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-6.
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