A coal body structure well logging quantitative identification method based on coal rock mechanical parameters
A technology of mechanical parameters and quantitative identification, applied in seismology for logging records, etc., can solve the problem of inconvenient selection of fracturing layers in coalbed methane reservoirs
Inactive Publication Date: 2015-04-01
XIAN UNIV OF SCI & TECH
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[0005] Judging from the existing methods, there is no systematic analysis of the internal relationship between the coal-rock mechanical parameters and the coal structure on the basis of the calculation of the coal-rock mechanical parameters using the logging data, and the establishment of a coal structure identification method, which gives the coalbed methane Reservoir fracturing layer optimization and other inconveniences
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[0044] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0045] refer to figure 1 , a coal rock fracturability logging quantitative evaluation method, comprising the following steps:
[0046]Step 1. Environmental impact correction of logging data: On the basis of identifying coal rocks and coal seams using density, resistivity and natural gamma ray logging curves, compare the drill bit diameter and borehole logging curve of the coal seam section to determine the expansion of the coal seam section, etc. The degree of influence of environmental factors. Based on the inversion constraints of the measured density and acoustic time difference in the coal and rock chamber, for different series of logging instruments, the corresponding environmental impact correction charts are selected, and the computer automatic visualization is performed on the basis of fitting the readings of the charts into a corre...
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The invention provides a coal body structure well logging quantitative identification method based on coal rock mechanical parameters. According to the method, based on coal rock mechanical parameters, and making full use of internal relations between integrality coefficients, fracture coefficients and stability coefficients and a coal body structure, a coal body structure index calculation model based on the coal rock mechanical parameters is established to carry out calculation on the coal body structure index, and coal body structure index calculation can be carried out by effectively utilizing logging information; the logging calculating coal rock mechanical parameters and the coal body structure are combined organically, the coal body structure identified quantitatively is basically consistent with coal body structure value obtained through coal rock core observation analysis, thereby greatly improving coal body structure well logging quantitative identification precision and providing well logging technical support for coal-bed methane reservoir fracturing horizon optimization.
Description
technical field [0001] The invention belongs to the well logging evaluation technology in coalbed methane exploration, drainage and development, in particular to a coal body structure logging quantitative identification method based on coal rock mechanical parameters. Background technique [0002] The coal body structure has an important influence on the fracturing effect. The degree of development of tectonic coal is the key factor restricting the development of coalbed methane. Structural coal not only reduces the permeability of coal seams, but also is not conducive to technological measures such as fracturing construction. Tectonic coal has low mechanical strength, loose coal structure, and cannot be brittlely cracked, so it is difficult to form cracks. When the fracture wall is formed during fracturing, a large amount of coal powder that breaks away and peels off will block the fractures, and the permeability of the coal seam will not be improved. Therefore, how to us...
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IPC IPC(8): G01V1/40
Inventor 汤小燕
Owner XIAN UNIV OF SCI & TECH