An evaluation method of coal-bearing logging sensitive parameters

Abstract

The invention provides a coal bearing property logging sensitive parameter evaluating method and belongs to the field of unconventional oil and gas exploration and development. The coal bearing property logging sensitive parameter evaluating method is based on coal core scale logging and comprises extracting and establishing coal bearing property logging rapid evaluation indexes and forming an expository mode by combining natural gamma logging value and density logging value with limetone stratum density logging mean value. The coal bearing property logging sensitive parameter evaluating method achieves rapid and intuitional explanation of gas reservoir of coal seams.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas exploration and development, and in particular relates to an evaluation method for coal-bearing logging sensitive parameters. Background technique [0002] The most direct method to evaluate the coal-bearing property and gas-bearing property of coalbed methane reservoirs is to drill coal cores, measure the parameters such as core vitrinite reflectance, carbon, hydrogen content and calorific value, and determine the coal rank according to the coal rank division standard; use Analytical method, Airi method, isotherm adsorption line method, Kem method and other methods to obtain the gas content of the reservoir. This is also an essential work for accurate evaluation of coal reservoirs in the early stage of exploration and development of a block, but this method is costly, has discontinuous data, takes a long time, and is inefficient, making it difficult to implement in practice. Well loggin...

AI Technical Summary

Problems solved by technology

The existence of pores and gas will change the response characteristics of conventional logging, but because a single logging information is affected by many factors, its interpretation is often multi-solution and uncertain

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