Method for quantitatively characterizing pores in shale

Abstract

The invention relates to a method for quantitatively characterizing pores in shale. The method comprises the following steps: S1, collecting a shale sample and injecting epoxy resin into the collectedshale sample in a high-temperature and high-pressure state; then grinding the shale sample with the injected epoxy resin into a laser confocal optical sheet; S2, carrying out optical slicing on the laser confocal optical sheet prepared by S1 in a laser scanning mode, so as to obtain a series of two-dimensional laser confocal photomicrographs; S3, based on identification of pores in the shale in S2, classifying the pores in the identified shale; and S4, carrying out three-dimensional modeling and quantitative characterization on the pores in the shale by applying three-dimensional modeling software. According to the method provided by the invention, the pores with different formation factors in the shale are identified by applying a fluorescent technology, and different pore types in the shale are divided; and a two-dimensional fluorescent confocal slice is subjected to three-dimensional fluorescent modeling and quantitative characterization of the pores in the shale.

Description

technical field [0001] The invention relates to a quantitative calculation method for pores in continental shale, in particular to a quantitative characterization method for pores in shale. Background technique [0002] With the large-scale exploration and development of shale oil and gas in China, China's continental shale has once again become the focus of global attention. For China, in the exploration of conventional oil and gas resources, the reservoir is already very tight, and has already entered the era of low porosity and low permeability, even ultra-low porosity and ultra-low permeability. For example, the Paleozoic natural gas reservoirs in the Ordos Basin have reached the level of low porosity and low permeability to ultra-low porosity and low permeability. For mud shale in continental deposits, the reservoir appears to be tighter. As we all know, for shale oil and gas, the identification and quantification of micro-nano pores in shale, and the classification o...

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Problems solved by technology

Conventional physical property testing, for shale, it is difficult to obtain the column used for analysis (because shale is fragile); and the current popular mercury injection, CO 2 or N 2 Adsorption only reflects the size of shale pores from the aspects of specific surface area and specific surface volume, but does not really reveal the actual size of shale pores; although CT analysis technology can fully reveal the size of micro-nano pores in shale, the price expensive, not easy to operate

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