Analytic hierarchy process based coal bed methane comprehensive evaluation method

Abstract

The invention provides an analytic hierarchy process based coal bed methane comprehensive evaluation method and belongs to the field of seismic exploration and development of oil gas and coal bed methane. The method includes: (1) acquiring main controlling factors of coal bed methane enrichment by means of areal geology analysis; (2) constructing a judgment matrix according to the main controlling factors; (3) calculating weight values of elements, standing for the main controlling factors of coal bed methane enrichment, in the judgment matrix; (4) setting a coal bed methane enrichment area as a research object layer, setting the main controlling factors as a reference layer, and completing comprehensive evaluation of the coal bed methane enrichment area according to an analytic hierarchy process. The analytic hierarchy process based coal bed methane comprehensive evaluation method has the advantages that by means of a geophysical method and the AHP (analytic hierarchy process), weighting coefficients of the main controlling factors of coal bed methane are obtained by calculation; by means of linear operation and relevant physical geographical predication technological achievements, a coal bed methane comprehensive evaluation map of the coal bed distribution area is obtained, and an evaluation result and an actual drilling result are highly uniform.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development of oil and gas and coalbed methane, and in particular relates to a comprehensive evaluation method for coalbed methane based on analytic hierarchy process, which is used for predicting and studying the gas content of coalbed methane reservoirs. Background technique [0002] At present, in the process of sustainable development, under the guidance of major trends such as energy supply and environmental protection, the exploration and development of coalbed methane has attracted more and more attention from the world, and the investment in coalbed methane research has also increased. However, due to the relatively late start of systematic research on coalbed methane as a whole, there is no method and technology mainly for coalbed methane exploration and development. [0003] Coal bed methane is a kind of unconventional natural gas, which belongs to a kind of gas with strong adsorpt...

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Problems solved by technology

The burial depth of coal seams, roof and floor lithology, coal quality characteristics, reservoir pressure, coal seam thickness, and coal reservoir permeability all have a great influence on the formation and gas-bearing characteristics of coalbed methane reservoirs. Under certain circumstances, it is less reliable to use a single gas-bearing prediction method to carry out gas-bearing prediction and evaluation analysis of coalbed methane reservoirs

Although a variety of comprehensive evaluation and analysis methods have been used in the exploration and development of conventional oil and gas, the comprehensive evaluation and analysis methods in the field of coalbed methane exploration and development are not mature enough, especially for the comprehensive evaluation of coalbed methane gas content.

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