Shale gas reservoir favorable area selection integrated evaluation method

Abstract

The invention discloses a shale gas reservoir favorable area selection integrated evaluation method. Methane absorbed by shale with a quite high total organic carbon content is obviously higher than methane absorbed by shale with a quite low total organic carbon content, and the organic carbon content is more than 2%; the heat maturity of kerogen also affects the amount of natural gas which can be absorbed on the surface of an organic substance in the shale, the absorption gas amount of a shale gas is gradually increased, and the maturity of an organic matter is between 1.4% to 3%; gas-containing shale is taken as a fine-granule compact sandstone reservoir layer, the increase of a carbonate content reduces the geological reserve of the shale gas, and siliceous-rich shale can play a better role than clay-rich shale in manual fracturing; and the shale net thickness of a shale gas exploration and production area is 9 to 91m. According to the evaluation method provided by the invention, through integrated evaluation of evaluation parameters, a shale gas reservoir area can be accurately determined, and accurate reference data is provided for exploitation of the shale gas.

Description

technical field [0001] The invention relates to a method, in particular to a comprehensive evaluation method for selecting favorable areas of shale gas reservoirs. Background technique [0002] The research on shale gas exploration, development and production began in the United States. In 1821, its first industrial natural gas drilling well (fracture gas was produced at a depth of 8m) was a Devonian shale gas well, which opened the way for the development of the natural gas industry in the United States. prelude. Since then, shale gas reservoirs in the United States have been discovered one after another. By 1926, the Eastern Kentucky and West Virginia gas fields (Devonian shale) were the largest natural gas fields in the world at the time. In the 1970s and 1980s, on the basis of finding out the distribution rules of shale gas and evaluating the resource potential in the United States, new shale gas fields were continuously discovered in the eastern region and the product...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of inaccurate evaluation due to the limitation of evaluation parameters in the above-mentioned existing evaluation methods, making the selection target of shale gas unclear, waste of manpower and material resources, and a method for selection of favorable areas of shale gas reservoirs is designed. Comprehensive evaluation method, through the comprehensive evaluation of evaluation parameters, this evaluation method can make accurate judgments on shale gas reservoir areas, provide accurate reference data for shale gas exploitation, and solve the problem of existing evaluation methods due to the lack of evaluation parameters. Restrictions lead to inaccurate evaluation, unclear targets for shale gas selection, and waste of manpower and material resources