Method and device for measuring and calculating underground organic matter porosity degree

Abstract

The invention provides a method and device for measuring and calculating the underground organic matter porosity degree. The method includes the steps that multiple well points are selected in a research region, and a relation curve between the organic carbon recovery coefficient and the organic matter thermal evolution degree of the research region is obtained; the organic matter thermal evolution degrees of all the selected well points are obtained, and the following operations are conducted on all the well points: the original organic carbon weight percentage content of all the well points is calculated, the maximum organic matter porosity degree of the well points is calculated, the observation organic matter porosity degree of the well points is worked out, weighted averaging is conducted on the maximum organic matter porosity degree and the observation organic matter porosity degree of the well points, and the average organic matter porosity degree of the well points is worked out. By means of the method and device for measuring and calculating the underground organic matter porosity degree, the technical problem that in the prior art, measurement and calculation of the organic matter porosity degree are inaccurate in measuring and calculating result is solved, and the accuracy of the measuring and calculating result is improved.

Description

technical field [0001] The invention relates to the technical field of research on physical properties of shale reservoirs and shale oil and gas resources, in particular to a method and device for measuring and calculating the porosity of underground organic matter. Background technique [0002] Shale oil and gas is currently one of the most concerned types of unconventional oil and gas. It is a field of potential oil and gas resource replacement that major oil companies are investing in research. The measurement of organic matter porosity in the underground state has a great impact on the physical properties of shale reservoirs. Research and calculation of shale oil and gas resources are very important. [0003] Organic matter pores refer to the residual pore space after solid kerogen is transformed into non-solid hydrocarbons during the hydrocarbon generation process of organic matter in shale, and organic matter porosity refers to the percentage of organic matter pore vol...

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Problems solved by technology

[0013] This method is actually an improvement of the PhiK model. This method converts the maximum porosity of organic matter under ideal conditions into the porosity observed on the ground Ar ion polished thin section, which will also appear in the middle and low evolution stages (Ro<1.2), that is In the oil window stage, the prediction effect is poor

[0014] From the above analysis, it can be seen that the current methods for measuring the porosity of organic matter have the problem that the prediction results are too large or too small, which leads to inaccurate results of measuring the porosity of organic matter

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