A method for measuring organic matter content in shale

Abstract

The invention provides a method for measuring organics content in shale and belongs to the field of physical research on rock. The method comprises the steps of determining a gray value range of organics of a core sample; performing three-dimensional image reconstruction on another core sample; picking up organics in a three-dimensional image according to the determined gray value range of the organics; counting pixels of the organics; calculating the content of the organics. For a shale sample in a specific area, the method for measuring organics content in shale selects a core sample first and extracts organics in the core sample by chemical separation; the organics sample that is extracted is scanned on an X-ray apparatus, and the gray value range of the organics is acquired from scanning results; then the core sample to be analyzed is subjected to CT scanning, a core three-dimensional image is reconstructed on a computer, and according to the known organics gray value, organics are identified and marked on the core three-dimensional image so as to statistically acquire the content of the organics.

Description

technical field [0001] The invention belongs to the field of rock physics research, in particular to a method for measuring the content of organic matter in shale. Background technique [0002] The organic matter content in shale is an important index to evaluate its ability to produce oil and gas. In shale oil and gas exploration, the organic matter enriched area is one of the important targets of seismic exploration. In the prior art, the organic matter separation technology is usually used to measure the organic matter content in shale. [0003] Organic matter in rocks usually exists in the form of solid (kerogen), liquid (oil), and gas. The organic matter involved in the present invention refers to the organic matter existing in solid form. This part of organic matter can usually be extracted from rocks by means of chemical dissolution and separation. Its main technology is to use a variety of organic acids and inorganic acids to remove other components in shale under ...

AI Technical Summary

Problems solved by technology

In the implementation process of the method in the prior art, the organic matter itself is lossy, and the purity of the extracted organic matter is also uneven, which directly leads to inaccurate measurement results

Moreover, the identification of organic matter content by chemical separation method is a slow process, which takes a long time and is not efficient.

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