Device and method for measuring change trend of gas-bearing property of shale

Abstract

The invention discloses a device and a method for measuring the gas-bearing change trend of shale. The device comprises a water bath kettle, a transparent gas collecting unit and a transparent gas measuring unit, wherein the water bath kettle is used for containing a rock core sample and sodium chloride saline water; the transparent gas collecting unit covers the core sample and is used for collecting desorbed gas of the core sample; and the transparent gas measuring unit is connected with the transparent gas collecting unit and is used for measuring the volume of the desorbed gas collected by the transparent gas collecting unit. The shale gas desorption rate can be rapidly measured for the unconventional natural gas drilling core, rapid and fine description of the gas-bearing property change trend of the whole-well-section core is achieved, the minimum sampling interval can be designed to be about 5cm, and more accurate parameters are provided for shale gas-bearing property evaluation.

Description

technical field [0001] The invention belongs to the technical field of rock gas exploration and development, and more particularly, relates to a device and a method for measuring the change trend of gas-bearing property of shale. Background technique [0002] At present, there are two main methods for testing the gas content of shale: one is on-site gas content measurement. The drilled core is put into a proprietary equipment for gas content testing experiments. The minimum sampling distance of this method is about 1 meter. . The other is to use logging curve modeling to simulate the change process of shale gas content in the whole well based on the field gas content test data. The minimum vertical resolution achieved by this method is also about 0.6 meters. Due to the strong heterogeneity of shale (especially continental shale), neither of these two methods can describe its gas-bearing variation trend more precisely, which directly affects the accurate evaluation of shale ...

AI Technical Summary

Problems solved by technology

Due to the strong heterogeneity of shale (especially continental shale), neither of these two methods can describe the variation trend of its gas-bearing properties more precisely, which directly affects the accurate evaluation of shale gas-bearing properties.

There are also some indirect methods. Generally, the variation trend of gas content is obtained by interpreting well logging curves, but this is often a little bit different from the actual situation, and the interpretation of well logging has multiple solutions, so it is impossible to describe the gas content finely. Trend

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