CN114863051A - Method and system for building coal mine three-dimensional gas geological model - Google Patents
Method and system for building coal mine three-dimensional gas geological model Download PDFInfo
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Abstract
The invention discloses a method and a system for constructing a coal mine three-dimensional gas geological model, which comprises the following steps: constructing a three-dimensional model of a coal mine; acquiring a geological layer structure of the coal mine based on the three-dimensional model of the coal mine; acquiring and marking characteristic points of gas existence based on a geological layer structure of a coal mine; calculating to obtain the gas concentration of the characteristic points based on the characteristic points of the gas; and obtaining the gas distribution of the coal mine based on the gas concentration of the characteristic points, and completing the construction of a three-dimensional gas geological model of the coal mine. Geological information can be displayed more intuitively and fully, the spatial change rule of gas is fully disclosed, and the method has guiding significance for coal mine safety mining.
Description
Technical Field
The invention relates to the technical field of coal mine gas geological model construction, in particular to a method and a system for constructing a coal mine three-dimensional gas geological model.
Background
As most geological structures in coal mine engineering are complex, various stratum information needs to be acquired before underground engineering construction is carried out, so that engineering construction is facilitated. Generally, a large amount of geological information data including information of surface topography, gas distribution and concentration, etc. may be obtained through geological exploration, measurement, etc. in order to provide effective support for construction. However, these data are often discrete and discontinuous data, and it is difficult for geologists to analyze their distribution in the geologic body.
Mine gas (mainly composed of methane) has explosion risks, and when roadway gas is gushed out, methane-air is not uniformly distributed, but multidimensional concentration gradients exist, and explosion can occur if an ignition source occurs. The multidimensional concentration gradient characteristics and the evolution law of the coal mine methane are mastered, and the method has guiding significance for coal mine safety mining. In the prior art, a one-dimensional concentration field is mostly constructed, and the one-dimensional concentration field has a certain difference with the complex concentration gradient of methane in a coal mine, so that the characteristics of the multi-dimensional concentration field existing in gas cannot be fed back by a simulation result. The spatial change rule cannot be fully revealed, people are difficult to directly, completely and accurately understand and feel the gas distribution condition of the coal mine, and the working requirements of engineering geologists and actual operators cannot be met more and more.
Disclosure of Invention
In order to solve the problems of incomplete and inaccurate coal mine gas distribution in the prior art, the invention provides a method and a system for constructing a coal mine three-dimensional gas geological model.
In order to achieve the technical purpose, the invention provides a method for constructing a coal mine three-dimensional gas geological model, which comprises the following steps:
step 1, constructing a three-dimensional model of a coal mine;
step 2, acquiring a geological layer structure of the coal mine based on the three-dimensional model of the coal mine;
step 3, acquiring and marking characteristic points of gas existence based on the geological stratum structure of the coal mine;
step 4, calculating to obtain the gas concentration of the characteristic points based on the characteristic points in which the gas exists;
and 5, obtaining the gas distribution of the coal mine based on the gas concentration of the characteristic points, and completing the construction of a three-dimensional gas geological model of the coal mine.
Optionally, the three-dimensional model building process of the coal mine includes:
acquiring drilling data of an exploratory hole of the coal mine, performing interpolation calculation on the drilling data to obtain interpolation data, and integrating the drilling data and the interpolation data to obtain modeling data;
generating point cloud data based on the modeling data, and generating a ground curve according to the point cloud data;
and extracting vertex data based on the ground curve to construct the three-dimensional model of the coal mine.
Optionally, the geological formation of the coal mine comprises a normal fault, a reverse fault, a translation fault and a collapse column.
Optionally, the gas concentration calculation process of the feature point includes:
measuring the discrete distribution characteristic of the gas concentration of the characteristic points by adopting an optical gas identification instrument;
based on the discrete distribution characteristic of the gas concentration, drawing the gas concentration distribution cloud chart by combining a linear interpolation theory;
acquiring transverse characteristic parameters and longitudinal characteristic parameters of the characteristic points based on the gas concentration distribution cloud chart;
and obtaining the gas concentration of the characteristic point based on the transverse characteristic parameter and the longitudinal characteristic parameter.
The invention also provides a system for constructing the coal mine three-dimensional gas geological model, which comprises the following steps: the system comprises a construction module, a first acquisition module, a second acquisition module and a first calculation module;
the construction module is used for constructing a three-dimensional model of a coal mine;
the first acquisition module is used for acquiring a geological stratum structure of the coal mine;
the second acquisition module is used for acquiring characteristic points of gas existence;
the first calculation module is used for calculating the gas concentration of the characteristic point.
Optionally, the building module includes: the device comprises a third acquisition module, a second calculation module and an integration module;
the third acquisition module is used for acquiring drilling data of an exploration hole of the coal mine;
the second calculation module is used for carrying out interpolation calculation on the drilling data;
the integration module is to integrate the borehole data and the interpolation data, and to generate point cloud data based on the modeling data.
Optionally, the first computing module includes: the device comprises a measuring module and a drawing module;
the measuring module is used for measuring the discrete distribution characteristics of the gas concentration of the characteristic points;
the drawing module is used for drawing the gas concentration distribution cloud picture by combining a linear interpolation theory according to the discrete distribution characteristic of the gas concentration.
Optionally, the measuring module comprises an optical gas identifier.
The invention has the following technical effects:
the method combines the three-dimensional model for constructing the coal mine with the gas multidimensional concentration field, realizes the construction of the three-dimensional stratum model according to the actually measured stratum data information, can more intuitively and fully display the geological information, fully reveals the space change rule of the gas, has guiding significance for the safe mining of the coal mine, and provides powerful support for engineering construction.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a coal mine three-dimensional gas geological model construction method according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention discloses a method for constructing a coal mine three-dimensional gas geological model, which comprises the following steps:
step 1, constructing a three-dimensional model of a coal mine, and the process is as follows:
step 1.1, obtaining drilling data of an exploratory hole of the coal mine, carrying out interpolation calculation on the drilling data to obtain interpolation data, and integrating the drilling data and the interpolation data to obtain modeling data;
specifically, when exploration drilling is performed in actual work, due to the special geological characteristics of a coal mine, the obtained drilling data are often lost and repeated, in the embodiment, typical layered drilling and special layered drilling are separated, and the obtained drilling data are layered one-to-one. And numbering the stratum of the drilling data corresponding to the exploration holes according to a deposition sequence, wherein the stratum with the later deposition year is numbered to be smaller, a stratum with the thickness of 0 is added for stratum loss existing in special layering, and the stratum is numbered according to the sequence of the soil layer labels from small to large, so that the stratum sequences of all the exploration holes are generated.
According to the sequence from small to large, interpolation calculation is carried out on the drilling data by adopting a Krigin interpolation model, the weight coefficient of an actual drilling point in the drilling data to an interpolation point P is marked as alpha through any interpolation point P obtained by the Krigin interpolation model, if the thickness of the actual drilling point in the current stratum is 0, the weight coefficient alpha is compared with a preset weight boundary condition q, and if alpha is larger than q, the thickness of the interpolation point P in the current stratum is 0.
And searching and sequencing all interpolation data and drilling data, and arranging according to the sequence of the exploration holes from small to large to obtain modeling data.
Step 1.2, generating point cloud data based on the modeling data, and generating a ground curve according to the point cloud data;
specifically, a non-uniform rational B-spline model is adopted to fit the modeling data to generate a stratum curve, during fitting, an inverse algorithm is adopted to calculate control vertexes to fit a curve surface, and a weight coefficient of each vertex on the curve surface is limited to be 1.
Step 1.3, extracting vertex data based on the ground curve, and constructing the three-dimensional model of the coal mine;
extracting an upper surface vertex set and a lower surface vertex set in the stratum curve, respectively determining a vertex as a starting point in the upper surface vertex set and the lower surface vertex set, respectively adjusting the sequence of the vertexes in the two vertex sets, and ensuring that the vertexes in the two vertex sets are all arranged in the same direction. And selecting two vertexes from any one vertex set of the upper surface vertex set and the lower surface vertex set, selecting another vertex from another vertex set, and connecting the selected three vertexes to construct a coal mine three-dimensional model.
Step 2, acquiring a geological layer structure of the coal mine based on the three-dimensional model of the coal mine;
according to the manual exploration method in the step 1, drilling information of the manual exploration hole is obtained, historical data of geological drilling of the coal mine in the past year are consulted, the geological type of the coal mine is obtained, and then the geological layer structure of the coal mine is obtained.
The geological formation of the coal mine comprises: fault breaking: normal faults, reverse faults, translation faults, collapse columns. Due to the relative movement of the two fault trays, the fault that the upper tray descends and the lower tray ascends is a normal fault, the fault that the upper tray ascends and the lower tray descends is a reverse fault, and the two fault trays move along the fault plane to the relatively sliding fault pair translation fault. The fault causes the discontinuity of the coal bed, the stress of the coal body is soft, the gas gushes water and the falling column can be a passage of mine gas, which affects the safety of coal mine production.
Step 3, acquiring and marking characteristic points of gas existence based on the geological stratum structure of the coal mine;
the feature points are used to represent points where gas is present in different geological layers of the coal mine in the three-dimensional model constructed in step 1. And detecting gas in the coal mine by adopting a mine gas detector, and marking characteristic points.
Step 4, calculating to obtain the gas concentration of the characteristic points based on the characteristic points in which the gas exists;
step 4.1, measuring the discrete distribution characteristic of the gas concentration of the characteristic points by adopting an optical gas identifier;
specifically, based on the discrete distribution characteristic of the gas concentration of the feature points measured in a discrete grid point distribution mode, the transverse and longitudinal distances of the discrete grids are not more than 1000mm, the single measurement time of each grid node is not less than 30s, the measurement times of each grid node are not less than three times, and the optical gas identifier is adopted to measure the specific concentration of the gas at different spatial positions.
Step 4.2, based on the discrete distribution characteristic of the gas concentration, combining a linear interpolation theory to draw the gas concentration distribution cloud chart;
specifically, according to the discrete distribution characteristic of the gas concentration obtained in the step 4.1 on the cross section of the geological layer of the coal mine, a full-section gas concentration distribution cloud chart is drawn by combining a linear interpolation theory, and the pseudo-continuous accurate measurement of the gas concentration is realized. The linear interpolation theory is a method of determining a value of an unknown quantity between two known quantities by using a straight line of the two known quantities, in this embodiment, gas concentrations of two representative feature points are measured, and then the gas concentration of a feature point on a connecting line of the two representative feature points and between the two representative feature points is determined according to the measurement result. Therefore, the pseudo-continuous accurate measurement of the gas concentration in the whole cross section of the cross section of different geological layers of the coal mine is finally realized.
4.3, acquiring transverse characteristic parameters and longitudinal characteristic parameters of the characteristic points based on the gas concentration distribution cloud picture;
the value range of the transverse interval x of the adjacent characteristic points is more than or equal to 800mm and less than or equal to 2000mm, and transverse characteristic parameters of the characteristic points are obtained according to the gas concentration distribution cloud pictures of the whole sections of different geological layers of the coal mine obtained in the step 4.2 and the transverse interval x of the adjacent characteristic points;
and (3) obtaining the longitudinal characteristic parameters of the characteristic points according to the gas concentration distribution cloud pictures of the different geological layers of the coal mine obtained in the step (3.2) and the longitudinal arrangement depth y of the adjacent characteristic points, wherein the arrangement depth y of the characteristic points is more than or equal to 0 and less than or equal to n.
Integrating the transverse characteristic parameters and the longitudinal characteristic parameters to obtain the gas concentration of the characteristic points, wherein the deviation lambda between the average value of the measured gas concentration of the characteristic points and the average value of the gas concentration corresponding to the whole cross section of the geological layer of the coal mine is not more than 3 percent, and the calculation formula of the deviation lambda is as follows:
wherein the content of the first and second substances,
is an arithmetic mean value of two measured values representing the concentration of the gas to be measured at the characteristic points, n is the number of the characteristic points,
the method is a theoretical average value of the gas concentration in the whole cross section of different geological layers of the coal mine.
And 5, obtaining the gas distribution of the coal mine based on the gas concentration of the characteristic points, and completing the construction of a three-dimensional gas geological model of the coal mine.
Marking the characteristic points in the three-dimensional model according to the characteristic points of all gas in the coal mine obtained in the step 4 and the three-dimensional model of the coal mine obtained in the step 1 to obtain the gas distribution of the coal mine, and completing the construction of the three-dimensional gas geological model of the coal mine.
The invention also discloses a system for constructing the coal mine three-dimensional gas geological model, which comprises the following steps: the system comprises a construction module, a first acquisition module, a second acquisition module and a first calculation module;
the construction module is used for constructing a three-dimensional model of a coal mine;
the first acquisition module is used for acquiring a geological stratum structure of the coal mine;
the second acquisition module is used for acquiring characteristic points of gas existence;
the first calculation module is used for calculating the gas concentration of the characteristic point.
Specifically, the building module includes: the device comprises a third acquisition module, a second calculation module and an integration module;
the third acquisition module is used for acquiring drilling data of an exploration hole of the coal mine;
the second calculation module is used for carrying out interpolation calculation on the drilling data;
the integration module is to integrate the borehole data and the interpolation data, and to generate point cloud data based on the modeling data.
Specifically, the first calculation module includes: the device comprises a measuring module and a drawing module;
the measuring module is used for measuring the discrete distribution characteristics of the gas concentration of the characteristic points;
the drawing module is used for drawing the gas concentration distribution cloud picture by combining a linear interpolation theory according to the discrete distribution characteristic of the gas concentration.
Specifically, the measuring module comprises an optical gas identifier.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for constructing a three-dimensional gas geological model of a coal mine is characterized by comprising the following steps:
step 1, constructing a three-dimensional model of a coal mine;
step 2, acquiring a geological layer structure of the coal mine based on the three-dimensional model of the coal mine;
step 3, acquiring and marking characteristic points of gas existence based on the geological stratum structure of the coal mine;
step 4, calculating to obtain the gas concentration of the characteristic points based on the characteristic points in which the gas exists;
and 5, obtaining the gas distribution of the coal mine based on the gas concentration of the characteristic points, and completing the construction of a three-dimensional gas geological model of the coal mine.
2. The method for coal mine three-dimensional gas geological model construction according to claim 1, wherein the coal mine three-dimensional model construction process comprises:
acquiring drilling data of an exploratory hole of the coal mine, performing interpolation calculation on the drilling data to obtain interpolation data, and integrating the drilling data and the interpolation data to obtain modeling data;
generating point cloud data based on the modeling data, and generating a ground curve according to the point cloud data;
and extracting vertex data based on the ground curve to construct the three-dimensional model of the coal mine.
3. The method for coal mine three-dimensional gas geological model construction according to claim 1, wherein the geological formation of the coal mine comprises normal faults, reverse faults, translation faults, and trapping columns.
4. The method for constructing the coal mine three-dimensional gas geological model according to claim 1, wherein the gas concentration calculation process of the feature points comprises the following steps:
measuring the discrete distribution characteristic of the gas concentration of the characteristic points by adopting an optical gas identification instrument;
based on the discrete distribution characteristic of the gas concentration, drawing the gas concentration distribution cloud chart by combining a linear interpolation theory;
acquiring transverse characteristic parameters and longitudinal characteristic parameters of the characteristic points based on the gas concentration distribution cloud chart;
and obtaining the gas concentration of the characteristic point based on the transverse characteristic parameter and the longitudinal characteristic parameter.
5. A system for building a coal mine three-dimensional gas geological model is characterized by comprising the following components: the system comprises a construction module, a first acquisition module, a second acquisition module and a first calculation module;
the construction module is used for constructing a three-dimensional model of a coal mine;
the first acquisition module is used for acquiring a geological stratum structure of the coal mine;
the second acquisition module is used for acquiring characteristic points of gas;
the first calculation module is used for calculating the gas concentration of the characteristic point.
6. The system for coal mine three-dimensional gas geological model construction according to claim 5, wherein said construction module comprises: the device comprises a third acquisition module, a second calculation module and an integration module;
the third acquisition module is used for acquiring drilling data of an exploration hole of the coal mine;
the second calculation module is used for carrying out interpolation calculation on the drilling data;
the integration module is to integrate the borehole data and the interpolation data, and to generate point cloud data based on the modeling data.
7. The system for coal mine three-dimensional gas geological model construction according to claim 5, wherein said first calculation module comprises: the device comprises a measuring module and a drawing module;
the measuring module is used for measuring the discrete distribution characteristics of the gas concentration of the characteristic points;
the drawing module is used for drawing the gas concentration distribution cloud picture by combining a linear interpolation theory according to the discrete distribution characteristic of the gas concentration.
8. The system for coal mine three-dimensional gas geological model construction according to claim 7, characterized in that the measurement module comprises an optical gas identification instrument.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115680571A (en) * | 2022-10-25 | 2023-02-03 | 贵州盘江煤电集团技术研究院有限公司 | Intelligent gas extraction method and system |
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| CN115680571A (en) * | 2022-10-25 | 2023-02-03 | 贵州盘江煤电集团技术研究院有限公司 | Intelligent gas extraction method and system |
| CN115680571B (en) * | 2022-10-25 | 2024-02-06 | 贵州盘江煤电集团技术研究院有限公司 | Intelligent gas extraction method and system |
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