Method for testing pore diameters of micropores and mesopores of organic matters and other minerals in shale

Abstract

The invention discloses a method for testing pore diameters of micropores and mesopores of organic matters and other minerals in shale. The testing method comprises the following steps of 1) obtaining pore diameter distribution data of micropores and mesopores of shale, 2) extracting organic matters from the shale core particle sample, 3) acquiring micropore and mesopore pore diameter distribution data of organic matters in the shale, and 4) according to the micropore and mesopore pore diameter distribution data of the shale and the micropore and mesopore pore diameter distribution data of the organic matters in the shale, acquiring micropore and mesopore pore diameter distribution data of other minerals in the shale. By means of the method, the micropore and mesopore distribution characteristics of the organic matter and other minerals in the shale sample can be obtained, important experimental data are provided for quantitative research on the pore space characteristics of the organic matter and other minerals in the shale, and establishment of pore volume evaluation models of the organic matter and other minerals in various pore diameter ranges can be assisted.

Description

technical field [0001] The invention relates to the technical field of shale oil and gas exploration and development, in particular to a method for testing micropore and mesopore diameters of organic matter and other minerals in mud shale. Background technique [0002] Shale reservoir cores have a very large pore-scale distribution span, including micropores (pore diameter<2nm), mesopores (2nm≤pore diameter≤50nm), macropores (pore diameter>50nm), and micron-scale fractures. Accurately obtaining the micropore and mesopore size distribution characteristics of organic matter in shale is the basis for microscopic reservoir evaluation, and has important guiding significance for the study of shale gas occurrence laws. At present, the test methods for studying mesopores and micropores of mud shale mainly include low-temperature carbon dioxide adsorption, low-temperature nitrogen adsorption, and low-temperature argon adsorption. The pore scale range of low-temperature carbon d...

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Problems solved by technology

[0003] At present, although the focused ion beam scanning electron microscope (FIB-SEM) technology has confirmed that the organic matter in the shale reservoir has a large number of pores, although it can also give the size of the organic matter pores in the microscopic view, it cannot provide the organic matter in the macroscopic sample. Pore ​​size distribution characteristics and rules

The gas adsorption test technology was used to analyze the pore size distribution of a large number of organic-rich shale, but it was unable to describe the pore size distribution of organic pores in organic-rich shale

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