Method for detecting clay content of shale reservoir

Abstract

The invention discloses a clay content detection method for a shale reservoir, and belongs to the technical field of shale gas exploration and development. The method comprises the following steps: detecting uranium-free gamma, resistivity, formation water mineralization degree, clay skeleton density, clay density, rock total porosity and a neutron value of clay; according to the uranium-free gamma value and the log value of the resistivity, the clay content is obtained; according to the formation water mineralization degree, the clay skeleton density, the clay density, the total rock porosity and the bound water content of the clay, the cation exchange capacity in the clay is obtained; according to the bound water content of the clay, obtaining a clay hydrogen index; measuring the composition of different minerals in the clay according to the cation exchange capacity and the clay hydrogen index; according to the composition of different minerals in the clay, the relative proportion of the different minerals in the clay is obtained; and obtaining the components of the clay according to the relative proportion of different minerals in the clay. According to the method, the clay content is quickly and directly obtained by using a conventional logging means, and the accuracy is high.

Description

technical field [0001] The present application relates to the technical field of shale gas exploration and development, in particular to a method for detecting clay content in shale reservoirs. Background technique [0002] In the exploration and development of shale gas and large-scale economic exploitation, a large number of horizontal wells and cluster wells must be drilled. At the same time, in order to save costs, it is impossible to coring and record logging projects in large sections. Therefore, a large number of special logging Projects such as element capture, nuclear magnetic resonance, sonic scanning, electrical imaging, etc. have little or no well logging during the development phase. Therefore, shale gas has entered the production capacity construction stage, and shale gas horizontal wells will face fewer measurement items. However, it is difficult to accurately obtain the complex mineral content of shale reservoirs by conventional logging. It is necessary to f...

AI Technical Summary

Problems solved by technology

Although ECS can identify the total content of clay, quartz, and carbonate rock, due to regional differences, the mineral composition processed by ECS can only represent a trend, not the real mineral content. It can be seen that the current clay content determination method is limited. Insufficient precision

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