Shale gas reservoir quality evaluation method based on logging information

Abstract

The invention provides a shale gas reservoir quality evaluation method based on logging information. The method includes the steps that the logging information and core information of a target layer section are collected; the organic carbon content, the clay content, the formation pressure coefficient and the gas content of the target layer section shale are determined according to the logging information and core information; the effective thickness of target layer section shale stratum is determined according to the organic carbon content; the buried depth of the shale stratum is determined according to the effective thickness; the weighted values corresponding to the organic carbon content, the clay content, the formation pressure coefficient and the total gas content, the effective thickness and the buried depth are determined respectively according to prestored shale gas well data and gas pool deliverability; the quality of a shale gas reservoir is evaluated according to the weight values, the organic carbon content, the clay content, the formation pressure coefficient, the total gas content, the effective thickness and the buried depth. By means of the method, a shale gas reservoir quality evaluation method is established, and the actual production requirements for reservoir quality and capacity level prediction are met in shale gas exploration and development.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to the logging field of oil and gas reservoirs in petroleum exploration, and specifically relates to a method for evaluating the quality of shale gas reservoirs based on logging data. Background technique [0002] As an important unconventional natural gas resource, shale gas has become a new highlight in the exploration and development of global oil and gas resources. It has attracted more and more attention from many countries and oil companies. It is one of the important fields of oil and gas exploration and development today. [0003] The geological conditions and formation mechanism of shale gas are completely different from traditional petroleum geological theories. The understanding of shale gas formation mechanism, enrichment law and main controlling factors at home and abroad has not yet been fully clarified. Due to the low porosity, ultra-low permeability, a...

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Problems solved by technology

Due to the low porosity, ultra-low permeability, and nanoscale pores of shale reservoirs, large-scale volume fracturing is usually used in the development of shale gas wells. Therefore, how to use well logging data to determine the quality of shale gas reservoirs? Evaluation and selection of favorable fracturing intervals play a pivotal role in shale gas exploration and development, but domestic research in this area is still in its infancy

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