Method and system for identifying type and content of clay mineral based on petrophysical analysis

Abstract

The invention provides a method and system for identifying the type and the content of a clay mineral based on petrophysical analysis. The method comprises the steps of: statistically analyzing the type and the content of the clay mineral in a core sample; performing ultrasonic elastic parameter testing on the core sample; performing intersection analysis based on a clay mineral type and content analysis result and an ultrasonic elastic parameter test result; and constructing a sensitive indication factor for measuring the sensitive degree of petrophysical parameters onto the type and the content of the clay mineral. According to the method and the system provided by the invention, starting from the type and the content of the clay mineral of a real test sample of a laboratory, in combination with elastic parameter test data, the sensitive indication factor is constructed, so that difference in relative variation of seismic attributes when types and contents of different clay mineralsare represented is quantified; and thus, sensitive elastic parameters are optimized. Theoretical basis is provided for predicting the type and the content of the clay mineral by utilization of a geophysical method.

Description

technical field [0001] The invention belongs to the field of geophysical research, and the invention relates to X-ray diffraction analysis, intersection analysis and sensitivity analysis, more specifically, to a method and system for identifying clay mineral types and content based on rock physics analysis. Background technique [0002] Clay minerals are a general term for hydrous phyllosilicates and hydrous amorphous silicate minerals. Clay minerals are widely distributed in sedimentary rocks, and are increasingly used in sedimentary petrology, petroleum geology, and oil and gas exploration and development, and are closely related to all aspects of oil and gas exploration and development. A large amount of clay minerals in the reservoir is one of the important factors causing the poor physical properties of the reservoir. The difference in the type and content of clay minerals has a great influence on the physical properties, sensitivity, wettability, etc. of the reservoir....

AI Technical Summary

Problems solved by technology

However, there are few reports on seismic identification and evaluation of the types and contents of clay minerals, and the research in this area is almost blank.

[0004] At present, there are few reports at home and abroad on the use of seismic data to identify the type and content of clay minerals, and the research on earthquakes is very weak, and there is no mature and effective method.

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