Characterization method of pore structure of shale gas reservoir and evaluation method of shale gas reservoir

Abstract

The invention provides a characterization method of a pore structure of a shale gas reservoir and an evaluation method of the shale gas reservoir and relates to the technical field of natural gas exploration. The characterization method of the pore structure of the shale gas reservoir comprises the following steps: determining a pore diameter boundary of a pore throat radius capable of being characterized by an adsorption method and a high-pressure mercury intrusion method; splicing a pore structure which is measured by the adsorption method and is located below the pore diameter boundary with a pore structure which is measured by the high-pressure mercury intrusion method and is located above the pore diameter boundary, so as to obtain pore structure characteristics of a shale gas micro-reservoir. According to the method provided by the invention, the pore structure characteristics of a full-aperture section can be characterized and a characterization result is more accurate. The evaluation method of the shale gas reservoir comprises the following step of evaluating the shale gas reservoir by utilizing a result obtained by the characterization method of the pore structure of the shale gas reservoir. The pore structure characteristics of the full-aperture section are tested by the characterization method of the pore structure of the shale gas reservoir and the characterization result is more accurate and has an active effect on a gas reservoir storage capability of the shale gas reservoir.

Description

technical field [0001] The invention relates to the technical field of natural gas exploration, and in particular to a characterization method for the pore structure of a shale gas reservoir and an evaluation method for the shale gas reservoir. Background technique [0002] At present, the adsorption method and high-pressure mercury injection method are usually used to measure the micro-nano pore structure parameters of shale reservoirs, but the main problem in the measurement is that the measurement ranges of different methods are different, and neither the adsorption method nor the high-pressure mercury injection method is suitable. It is possible to fully characterize the pore structure characteristics of micro-nano pores in shale reservoirs. This is because the pore size of the smaller organic pores in shale oil and gas storage pores is mainly in the range of 10-200nm; ) range, the micropore information above 50nm cannot be obtained, and for the pores above the mesopore...

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Problems solved by technology

[0002] At present, the adsorption method and high-pressure mercury injection method are usually used to measure the micro-nano pore structure parameters of shale reservoirs, but the main problems in the measurement are: the measurement ranges of different methods are different, and neither the adsorption method nor the high-pressure mercury injection method is suitable. Possibility to comprehensively characterize the pore structure characteristics of micro-nanopores in shale reservoirs

For mesopores, due to the "throat expansion" effect under high-pressure injection conditions, the measured results cannot objectively characterize the pore structure characteristics below the mesopores

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