Organic geochemical recognition method for effective gas reservoir in tight sandstone

A tight sandstone and identification method technology, applied in scientific instruments, measuring devices, instruments, etc., can solve the problems of difficulty in obtaining commercial value and low accuracy of tight sandstone effective gas layers

Inactive Publication Date: 2016-08-24
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide an organic geochemical identification method for tight sandstone effective gas layers, to solve the defects of low accuracy in identifying effective tight sandstone gas layers and difficulty in obtaining commercially valuable industrial gas streams

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  • Organic geochemical recognition method for effective gas reservoir in tight sandstone
  • Organic geochemical recognition method for effective gas reservoir in tight sandstone
  • Organic geochemical recognition method for effective gas reservoir in tight sandstone

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Embodiment Construction

[0032] In the process of exploration and development of tight sandstone natural gas, the identification of effective gas layers in tight sandstone is the basic problem and task that needs to be solved in exploration, development and production. In the process of drilling tight sandstone, natural gas is often displayed in multiple intervals in long wells, and it is often interpreted as gas layers in logging and logging. However, due to tight reservoirs (porosity-3 μm 2), the capillary pressure is high, the gas saturation is low and the water saturation is high, the gas content per unit volume of rock is small, and the impact of the formation skeleton on the logging information is far greater than that of the fluid in the pores. The reflection is somewhat distorted, which also leads to a decline in the accuracy of identifying effective gas layers in tight sandstones using well logging curves. In the sandstone sections interpreted as gas layers by mud logging, gas testing often p...

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Abstract

The embodiment of the invention provides an organic geochemical recognition method for an effective gas reservoir in tight sandstone. The method comprises the steps that core samples are collected; the core samples are treated, extract saturated hydrocarbon is prepared and collected; a mass chromatogram of the extract saturated hydrocarbon is analyzed, a terpane-series M/Z191 mass chromatogram is extracted and compared with a standard diagram, and peak positions of tricyclic terpane C20, C21 and C23 and corresponding relative peak areas SC20, SC21 and SC23 in the terpane-series M/Z191 mass chromatogram are determined; the core sample with the largest relative peak area of C23 among tricyclic terpane C20, C21 and C23 and the relative peak area specific value SC23/(SC20+SC21) larger than 1 is used as the effective gas reservoir in the tight sandstone. Through the method, the problem that the effective reservoir in the tight sandstone is hard to recognize during logging can be effectively solved, and the recognition rate of the effective gas reservoir in the tight sandstone is increased.

Description

technical field [0001] The invention relates to the technical field of organic geochemistry, in particular to an organic geochemical identification method for tight sandstone effective gas layers. Background technique [0002] In the process of exploration and development of tight sandstone natural gas, the identification of effective gas layers in tight sandstone is the basic problem and task that needs to be solved in exploration, development and production. In the process of drilling tight sandstone, natural gas is often displayed in multiple intervals in long wells, and it is often interpreted as gas layers in logging and logging. However, due to tight reservoirs (porosity<10%, permeability<0.1×10 -3 μm 2 ), the capillary pressure is high, the gas saturation is low and the water saturation is high, the gas content per unit volume of rock is small, and the impact of the formation skeleton on the logging information is far greater than that of the fluid in the pores...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/02
CPCG01N30/06G01N30/02
Inventor 王力陈世加路俊刚邹贤利张焕旭徐坤董君妍
Owner SOUTHWEST PETROLEUM UNIV
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