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Method and system for predicting coalbed methane by inversion of elastic modulus parameters

An elastic modulus, coalbed methane technology, applied in seismic signal processing and other directions, can solve problems such as difficulty in quantification, many interference factors, and changes in coalbed elastic parameters.

Active Publication Date: 2015-11-18
PETROCHINA CO LTD +1
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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 gas AVO prediction technology may have multiple solutions and it is difficult to quantify

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  • Method and system for predicting coalbed methane by inversion of elastic modulus parameters
  • Method and system for predicting coalbed methane by inversion of elastic modulus parameters
  • Method and system for predicting coalbed methane by inversion of elastic modulus parameters

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Embodiment Construction

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. 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.

[0065] Such as figure 1 As shown, it is one of the flow charts of a method for predicting coalbed methane by using the inversion of elastic modulus parameters proposed by the present invention. include:

[0066] Step 101): Simplify the Zoeppritz equations to obtain an approximate formula of the elastic modulus of the Zoeppritz equations; wherein, the approximate formula of the elastic modulus of the Zoeppritz equations is:

[0067] R ...

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Abstract

The invention discloses a method and system for utilizing the inversion of modulus of elasticity parameters to predict coal bed gas. The method comprises the steps of simplifying a Zoeppritz equation set so as to obtain a modulus of elasticity approximate expression of the Zoeppritz equation set, wherein according to the modulus of elasticity approximate expression of the Zoeppritz equation set, in the expression, the lame constant relative variation, shear modulus relative variation, and relative density variation are provided; on the logging constraint condition, utilizing the modulus of elasticity approximate expression of the Zoeppritz equation set to conduct simultaneous inversion of the lame constant relative variation, the shear modulus relative variation, and the relative density variation before stacking, and predicting the coal bed gas according to the inversion results.

Description

technical field [0001] The present invention relates to the derivation of new elastic modulus approximate formulas of Zoeppritz equations, and using pre-stack gather seismic data, under logging constraints, using the maximum likelihood statistical method to estimate and inverse the elastic modulus approximate formulas of Zoeppritz equations The relative change of density, shear modulus and Lame constant can be used to detect coalbed methane enriched areas and coal seam fracture development areas. Background technique [0002] Coalbed methane refers to the gas in the coal seam, the main component is methane. Under the conditions of underground temperature and pressure reservoirs, more than 95% of the coalbed 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. If it can be well developed and utilized, it will alleviate the e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 欧阳永林林建东任森林曾庆才邱杰郭晓龙胡朝元薛明喜
Owner PETROCHINA CO LTD