Organic matter maturity characterization method and system based on electron beam charge effect

Abstract

The invention discloses an organic matter maturity characterization method and system based on an electron beam charge effect. The method can comprise the following steps of: selecting a plurality ofcore samples with different maturity, and processing and preparing the core samples to obtain a plurality of standard samples; calculating the electron beam residence time of each standard sample, andmeasuring the vitrinite reflectance of each standard sample; drawing an electron beam residence time-vitrinite reflectance cross-plot according to the electron beam residence time and vitrinite reflectance corresponding to each standard sample; and calculating the vitrinite reflectance of the sample to be tested according to the electron beam residence time and electron beam residence time-vitrinite reflectance cross-plot of the sample to be tested, so as to realize the organic matter maturity characterization. The organic matter maturity characterization method and system based on the electron beam charge effect can effectively characterize the maturity of the organic matter through the electron beam charge effect, adopt a scanning electron microscope for observation, accurately distinguish the composition of the organic matter and observe the surface topography characteristics of the organic matter, and have wider application.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas geology, and more specifically, to a method and system for characterization of organic matter maturity based on electron beam charging effect. Background technique [0002] At present, the general index reflecting the maturity of organic matter is mainly the vitrinite reflectance (vRo), which is a scale for dividing the stages of oil and gas generation of organic matter. However, there are also significant defects in the acquisition and validity of this parameter, such as the inability to directly and quantitatively characterize the maturity of marine strata, and the vitrinite reflectance cannot be effectively measured due to the general lack of vitrinite in marine sedimentary strata; The measurement of reflectance has high requirements for the experimenters, and it is necessary to accurately distinguish the vitrinite, inertinite and exinite under the microscope. However, for dispersed s...

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Problems solved by technology

However, there are also significant defects in the acquisition and validity of this parameter, such as the inability to directly and quantitatively characterize the maturity of marine strata, and the vitrinite reflectance cannot be effectively measured due to the general lack of vitrinite in marine sedimentary strata; The measurement of reflectance has high requirements for the experimenters, and it is necessary to accurately distinguish the vitrinite, inertinite and exinite under the microscope

However, for dispersed sedimentary organic matter (mudstone, shale, etc.), due to the small size of organic matter fragments and the wide variety of vitrinite and inertinite, it is difficult to accurately identify each microscopic component under a microscope

And there are requirements for the size of organic matter particles when measuring. When the organic matter fragments are small, it is impossible to get enough measuring points for reflectance measurement

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