Method for measuring mineralization of shale pore water

Abstract

The invention discloses a method for measuring the mineralization of shale pore water. The method comprises the following steps: G1, a fresh shale core is collected as a shale sample; G2, the contentof pore water in the well-prepared shale sample is determined; G3, the solute of the pore water in the shale sample is extracted for obtaining the aqueous solution of the solute; G4, the content of ions in the aqueous solution is detected and the original salinity C water of the shale pore water is obtained by calculation. The invention provides the method which calculates the mineralization basedon the weight of the pore water, which is fast and accurately measured by weighing the shale before and after dried, thereby overcoming the problem in the prior art that the pore water cannot be directly discharged out due to the reason that the shale has bad permeability, and also avoiding the problem of using the microanalysis technique such as an electron probe, and the like that the measuredvalue is not accurate due to the reason that the water sample can not be obtained or the porosity of the shale sample is directly determined, so that the mineralization of the pore water in the shalesample can be more conveniently, efficiently and accurately obtained.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploitation, and in particular relates to a method for investigating the salinity of shale pore water in the area before exploitation of shale gas. Background technique [0002] Shale gas is a natural gas resource that can be exploited in shale layers, and China's recoverable shale gas reserves are relatively large. The formation and enrichment of shale gas has its own unique characteristics, and it is often distributed in the thick and widely distributed shale source rock formations in the basin. Compared with conventional natural gas, shale gas development has the advantages of long production life and long production cycle. Most of the shale gas producing shale gas has a wide distribution range, large thickness, and generally contains gas, which enables shale gas wells to operate with stable long-term performance. rate of gas production. Shale gas refers to unconventional natural gas exist...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that the salinity detection of shale pore water is difficult in the above-mentioned prior art, the present invention provides a method for quickly and accurately measuring the quality of pore water for shale drying and weighing, and then performing subsequent salinity calculation. method

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