Experimental method for simulating shale organic pore evolution process

Abstract

The invention provides an experimental method for simulating a shale organic pore evolution process. The experimental method comprises the step one of, collecting an immature-low maturation shale sample, cutting the immature-low mature shale sample into a plurality of shale blocks, and polishing the shale blocks; the step two of determining simulation temperature, pressure and time; the step threeof filling quartz sand in a sample chamber, and sequentially filling the shale blocks; the step four of carrying out a thermal simulation experiment on hydrocarbon generation and evolution of shale in a low evolution stage; the step five of taking out the shale blocks, mechanically grinding parts of the shale blocks, etching the surface of the sample, and measuring the vitrinite reflectance according to an SY / T5124-2012 sedimentary rock vitrinite reflectance measurement method; the step six of repeating the step three and the step five; and the step seven of repeating the step six until the set evolution phase is all completed. According to the experimental method, after thermal simulation in different evolution stages, the requirement of argon ion polishing sample preparation on scanningelectron microscope observation can be met, and the influence of shale heterogeneity and the damage effect of a pressing device on the shale sample are reduced.

Description

Technical field [0001] The invention relates to the field of unconventional oil and gas geology, in particular to an experimental method for simulating the evolution process of organic pores in shale. Background technique [0002] With the great commercial success of shale oil and gas in the exploration and development of unconventional oil and gas, the microscopic pores of shale reservoirs as the carrier of shale oil and gas have attracted more and more attention from domestic and foreign scholars. Advanced high-resolution microstructure analysis techniques such as ultra-low pulse permeability analysis, mercury intrusion-gas adsorption combined technology, argon ion polishing-field emission scanning electron microscope, focused ion beam scanning electron microscope, and nano-micro CT have been used in shale. The holographic characterization of the microstructure shows that as the degree of evolution increases, nanopores are widely developed in organic-rich shale, which is an imp...

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Problems solved by technology

Although the samples of thermal simulation in different evolution stages of these methods come from the same piece of mud shale, due to the strong heterogeneity of mud shale, it is equivalent to the difference in the mud shale samples of thermal simulation experiments at each temperature point. Yes, comparing the evolution process of their organic pores in this way, due to the reasons of the samples themselves, to a certain extent restricts the scientific understanding of the formation and evolution of organic pores in shale

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