A kind of porosity measuring method

Abstract

The invention relates to a pore measurement method which comprises the following steps: an effective signal determination step: regulating a temperature of a rock core to be analyzed into a preset temperature, regulating the temperature of the rock core to be analyzed according to a preset temperature change rate, determining a basic noise signal according to a nuclear magnetic resonance signal measured when the rock core to be analyzed is in a crystalline state, and determining an effective nuclear magnetic resonance signal at each temperature according to a nuclear magnetic resonance signal measured when the rock core to be analyzed is in a non-crystalline state and the basic noise signal; and a pore size determination step: determining the size of a pore in the rock core to be analyzed according to the effective nuclear magnetic resonance signal at each temperature. According to the pore measurement method, by adopting nuclear magnetic resonance nondestructive testing means, based on a low-temperature variable entropy nuclear magnetic resonance test technology, a nuclear magnetic resonance T2 spectrogram of a shale reservoir at different temperatures is tested, and by taking the spectrogram as a test basis, measurement of microscopic pore size distribution in a micro-nanometer magnitude of the shale reservoir is realized.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a pore measurement method. Background technique [0002] As shale oil and gas reservoirs such as Barken, Barnet, and Eagleford in North America and Fuling shale gas reservoirs in my country have been put into production, the proportion of unconventional oil and gas production has increased, which has also triggered an upsurge of research on the pore structure of shale reservoirs at home and abroad. However, through investigation, it is found that there are still many problems in the existing research on the pore structure characteristics of shale reservoirs. [0003] First of all, for the existing analysis methods for the pore structure characteristics of shale reservoirs, the lower limit of pore size and test accuracy cannot meet the requirements of shale oil and gas reservoir research. Conventional oil and gas resources are usually rich in pores...

AI Technical Summary

Problems solved by technology

The latter three methods will cause damage to the core, while the synchrotron radiation source method requires a large accelerator, the system operation is complicated, the cost is high, and it is difficult to popularize

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