Method for describing pore feature of shale and enrichment relationship between shale and shale oil

Abstract

The invention provides a method for describing a pore feature of shale and an enrichment relationship between the shale and the shale oil. The method comprises the following steps: obtaining a plurality of core samples; performing high temperature pyrolysis on the multiple core samples, thus obtaining the oil content of each core sample of the multiple core samples; respectively treating the multiple core samples by more than one pore characterization analysis method, thereby obtaining the pore developing feature of each core sample in the multiple core samples; determining a pore characterization analysis method in which the pore developing degree is consistent with the change tendency of the oil content according to the pore developing feature and the oil content detection result; determining the pore range where the determined pore characterization analysis method is applicable to be pores in which shale oil is relatively enriched. According to the method, the problem that no researches on the relationship between pore development and shale oil enrichment are provided in the prior art is solved, and effective research on the relationship between pore development and shale oil enrichment is realized, so that oil exploration can be effectively guided.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method for describing the pore characteristics of mud shale and its relationship with shale oil enrichment. Background technique [0002] In the past, in reservoir development, mud shale was mainly used as source rock. With the continuous deepening of research on mud shale reservoirs, the research on mud shale reservoirs has also received more and more attention. At present, there are mainly three types of experimental analysis methods for the characterization of the pores of porous solids (such as shale): [0003] 1) Image analysis method [0004] The image analysis method mainly observes the sample directly through various microscopes (such as SEM), which can give the most intuitive understanding of the pore distribution of the rock. [0005] 2) Fluid injection method [0006] The fluid injection method generally uses non-wetting fluids such as mercury, or ga...

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Problems solved by technology

[0009] Although previous studies have shown that the above three analysis methods have their own advantages and disadvantages in revealing pore development, a comprehensive comparison between the various methods is still relatively lacking, and there is no research on pore development and shale oil and gas enrichment. relationship research

[0010] For the above problems, no effective solutions have been proposed so far

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