Shale multiscale full-information comprehensive characterization and longitudinal evolution law determination method

Abstract

The invention discloses a shale multiscale full-information comprehensive characterization and longitudinal evolution law determination method. Theshale multiscale full-information comprehensive characterization and longitudinal evolution law determination method comprises the following steps: sampling a target selected area on a standby rock core, and then determining petrology characteristics and organic matter content; determining a rock core organic matter enrichment area; carrying out a laser confocal microscope experiment on the organic matter enrichment area to obtain distribution characteristics of micron-sized light components and heavy components in the core large slice target selection area; in the organic matter enrichment area of the standby rock core,carrying out micro-nano CT scanning on the drilled rock core column to obtain rock core pore diameter distribution, coordination number and a three-dimensional pore structure; obtaining a blocky rock core piece of the standby rock core, and preparing a rock core polished piece; scanning the core polished section by using a scanning electron microscope, and determining mineral types and pore structure characteristics; scanning the core polished section by using an atomic force microscope to obtain the viscous force and deformation data of the core, and determining the occurrence characteristics of the nanoscale solid organic matter and the movable fluid; and matching the obtained test data with the rock core, and recovering the longitudinal evolution law of the rock core.

Description

technical field [0001] The invention relates to a multi-scale in-situ analysis method for shale with laminar development. Background technique [0002] In recent years, shale oil and gas, as the highlight of global unconventional oil and gas exploration and development, has broad development prospects. However, the existing evaluation technology encounters a bottleneck in thick mud shale: millimeter-scale laminae are developed, organic-rich laminae and organic-poor laminae appear alternately, resulting in strong heterogeneity and rapid change of mudstone, and reservoir evaluation It is very difficult. Previous research methods on cores, such as TOC, XRD, pyrolysis, etc., often used several or a dozen laminar rock samples to be crushed and analyzed, but these methods can only reflect the average properties of the core. However, scanning electron microscopy, laser confocal and other methods for laminae have the disadvantages of small analysis scales, and cannot study shale pe...

AI Technical Summary

Problems solved by technology

However, the existing evaluation technology encounters a bottleneck in thick mud shale: millimeter-scale laminae are developed, organic-rich laminae and organic-poor laminae appear alternately, resulting in strong heterogeneity and rapid change of mudstone, and reservoir evaluation It is very difficult. Previous research methods on cores, such as TOC, XRD, pyrolysis, etc., are often divided into several or a dozen laminar rock samples for analysis, but these methods can only reflect the average properties of cores.

However, scanning electron microscopy, laser confocal and other methods for laminae have the disadvantages of small analysis scales, and cannot study shale petrological characteristics, reservoir space characteristics and oil and gas occurrence characteristics across scales from nanometers to full diameters, let alone Determining the coupling relationship among the three and the spatial variation rule restricts the exploration and development of shale oil

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