Four-parameter coalbed methane predicting method and device

A four-parameter, coalbed methane technology, applied in measurement devices, seismology for logging records, geophysical measurements, etc., can solve problems such as difficulty in quantification, changes in coal seam elastic parameters, and many interference factors

Pending Publication Date: 2020-07-28
中国煤炭地质总局地球物理勘探研究院
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Problems solved by technology

The fly in the ointment is that the change of coal seam elastic parameters caused by "gas-rich" coal seams is very small, and there are many interference factors. At the same time, coalbed methane AVO prediction technology may have multiple solutions, and it is difficult to quantify

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  • Four-parameter coalbed methane predicting method and device
  • Four-parameter coalbed methane predicting method and device
  • Four-parameter coalbed methane predicting method and device

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Embodiment Construction

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0062] figure 1 It exemplarily shows a schematic flowchart of a method for predicting coalbed methane with four parameters provided by an embodiment of the present invention, and the method can at least be applied to coalbed methane detection.

[0063] Such as figure 1 As shown, the method mainly includes the following steps:

[0064] Step 101, simplifying the Zoeppritz equations to obtain an approximate formula of the elastic modulus of the Zoeppritz equati...

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Abstract

The invention discloses a four-parameter coalbed methane predicting method and device and relates to the technical field of coalbed methane exploration and development. The method comprises the following steps that: a Zoeppritz equation set is simplified, so that an elastic modulus approximate expression of the Zoeppritz equation set can be obtained, wherein the elastic modulus approximate formulaof the Zoeppritz equation set is described in the descriptions of the invention, delta k/M in the approximate formula is a volume modulus relative change factor, delta lambda/M in the approximate formula is a lame constant relative change factor, delta mu/M in the approximate formula is a shear modulus relative change factor, and delta rho/rho in the approximate formula is a density relative change factor; under a logging constraint condition, a pre-stack maximum likelihood statistical method is used for carrying out simultaneous inversion on the pre-stack volume modulus relative change factor, the lame constant relative change factor, the shear modulus relative change factor and the density relative change factor; and coalbed methane is predicted according to inversion results.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploration and development, in particular to a method and device for predicting coalbed methane with four parameters. Background technique [0002] Coal bed methane refers to the gas in the coal seam, and its main component is methane. Under the conditions of underground temperature and pressure reservoirs, more than 95% of the coal bed methane exists in the coal seam in an adsorbed state. On the one hand, coalbed methane is the cause of gas outbursts and explosions in coal mining. On the other hand, coalbed methane is also a clean energy source. If it can be well developed and utilized, it will alleviate the energy crisis to a certain extent and benefit human society. [0003] The gas adsorption capacity of coal seams is affected by many factors, such as coal seam heterogeneity, formation temperature and pressure, groundwater flow, and geological structure movement. At present, the expl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/40
CPCG01V1/306G01V1/40G01V2210/6169G01V2210/624G01V2210/6222G01V2210/6224
Inventor 孟凡彬郎玉泉林建东
Owner 中国煤炭地质总局地球物理勘探研究院
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