Earthquake geological recognition method based on the sealing gas dessert area based on the sealing unit and the rough collection

Abstract

The invention discloses a seismic geology identification method of a coal-bed gas dessert zone based on a seal-up unit and a rough set. According to characteristics of composition factors of the seal-up unit, pre-stack / post-stack seismic data is used to implement integrated seismic geology interpretation of coal system stratum construction, lithology and rock elasticity and physical parameters aswell as integrated analysis on sequence stratigraphy, seismic stratigraphy, seismic sedimentology and coal-bed gas geology; different information complement one another; and a rough set identificationtheory is used to discriminate the composition factors in an integrated way, and a coal-bed gas desert zone is identified. Research on change characteristics of the coal bed itself are converted intoresearch on construction, deposition and lithology change which has effect on coal-bed gas migration in vertical and horizontal directions of the coal system, the rough set is introduced into an extended identification method, the identification process is less relied on experience, interference of artificial factors is avoided, the coal-bed gas dessert zone is identified more reliably, and the practical application value is high.

Description

technical field [0001] The invention relates to the field of new energy technology, in particular to a method for seismic and geological identification of coalbed methane sweet spots based on storage units and rough sets. Background technique [0002] As a new energy source, coalbed methane has been paid more and more attention by people. At present, more and more countries are developing coalbed methane exploration and development. A variety of geophysical methods and technologies that have achieved success in the reservoir prediction of conventional oil and gas exploration are being experimentally applied to the prediction research of coal reservoirs and coalbed methane. For example: various seismic attribute analysis methods; seismic inversion technology under the constraints of logging, quality and other data; AVO technology that uses the variation of amplitude with offset to predict the change of fluid properties in rock pores; uses longitudinal and shear waves to predi...

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Problems solved by technology

[0051] The purpose of the present invention is to provide a seismic geological identification method for coalbed methane sweet spots based on storage units and rough sets, which greatly improves the reliability of coalbed methane sweet spot predictions and further improves the consistency of identification results to solve the problem of coalbed methane in the above-mentioned background technology. The specific properties of gas and the uncertainty of the direct prediction of coalbed methane earthquake

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