Organic matter pore formation and evolution in-situ observation method and application

Abstract

The invention discloses an organic matter pore formation and evolution in-situ observation method and application. The organic matter pore formation and evolution in-situ observation method comprises the following steps: step A, carrying out microscopic observation on a sample; step B, placing the sample in a cold and hot stage externally connected with a microscope, setting a first temperature programming condition and a first termination temperature, and recording an organic matter evolution process; step C, performing organic matter evolution characteristic observation on the sample; and D, repeating the step B and the step C for one or more times, and setting a second program heating condition and a second termination temperature until the organic matters disappear. The method can be used for shale organic matter pore formation and evolution in-situ observation, and provides more direct technical support for formation and evolution research of different types of organic matter pores.

Description

technical field [0001] The invention relates to an in-situ observation method and application of organic matter pore formation and evolution. Background technique [0002] Shale pore types can be divided into organic pores, clay mineral interlayer pores, spherical pores, fossil clastic pores, granular pores and micro-cracks. The domestic and foreign shale gas exploration and development practices show that organic pores are an important storage space for shale gas, the richer the organic matter, the higher the porosity, and the better the gas-bearing conditions of the shale. Organic matter porosity affects multiple characteristics of reservoir rocks, including total porosity, micropores, total gas content, and methane adsorption capacity. Shale microscopic pores are an important space for oil and gas storage. The developed nanoscale-microscale pores and the nanoscale pore network and fracture system connected with the microscale pores jointly control the occurrence and migr...

AI Technical Summary

Problems solved by technology

However, the existing technologies are usually aimed at the development characteristics of organic pores in different samples at different evolution levels (observed under a microscope) or the quantitative characterization of all pores, even if the pore evolution under the constraints of the geological process of low-mature source rocks is carried out. However, most of them have not carried out research on the pore evolution characteristics of specific organic matter, and the degree of microscopic heterogeneity of shale is relatively high, and different organic microcomponents contribute differently to the porosity of shale. The chemical composition and organic pore development of the generated oil and gas are different, and the effect of thermal maturity on porosity also varies with the organic microcomponent

[0004] Existing methods usually need to consume a certain amount of research samples for the study of shale pore evolution, and have not realized in-depth research on the formation and evolution of pores of different organic matter types in shale, which affects the evaluation of marine shale reservoir characteristics

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