Classification method of microscopic pores on mud shale

Abstract

The invention discloses a classification method of microscopic pores on mud shale. The classification method comprises the following steps: according to the basic form, observing the sizes of the pores under a microscope and classifying the pores into microscopic pores and microscopic cracks; according to the origins, classifying the microscopic pores into organic-matter pores, protogenic intercrystalline (grain) pores and secondary dissolved pores; according to a position relation of matrix components and particles around the microscopic pores, carrying out detailed classification on the microscopic pores; according to the origins, observing the characteristics of the pores under the microscope, and classifying the microscopic cracks into bedding cracks, construction cracks, corrosion cracks, diagenetic shrinkage cracks and overpressure cracks and the like. The classification method disclosed by the invention has the advantages that a classification method of microscopic reservoir space of the mud shale based on a 'form-origin-component' comprehensive classification scheme and following the three-stage classification principle, and a set of effective representation scheme is provided for studying the reservoir space of the reservoir of the mud shale, so that convenience is brought for further showing the relation between different pore types and the reservoir performance, and the application prospect in unconventional oil-gas exploration and development is wide.

Description

technical field [0001] The invention relates to the geological field of petroleum exploration and development, in particular to a method for classifying microscopic pores of mud shale. Background technique [0002] At present, with the successful exploration and development of shale gas in North America, it has triggered a global upsurge in unconventional oil and gas research, and the study of mud shale pores has become one of the most In terms of exploration horizon selection and resource potential evaluation, the study of shale microscopic reservoir space is of great significance. [0003] Loucks et al. pointed out that two problems must be solved in the study of shale reservoirs: (1) what is the storage space of oil and gas in the rock, and how much is there; (2) along which channels oil and gas flow from the matrix to the induced fractures to reach the borehole. To solve these two problems, it is necessary to specifically study the pore structure of shale reservoirs, i...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the defects of the existing technology, to provide a comprehensive classification scheme based on the principle of three-level classification, and to provide a comprehensive classification scheme for the study of shale reservoir storage space. A set of effective characterization schemes to solve the problems of reservoir space and seepage channel characteristics in shale reservoirs, and a classification method for shale to help evaluation of shale reservoirs