Determination method of irreducible water content in shale
A determination method and technology of irreducible water, applied in measuring devices, water resources assessment, instruments, etc., can solve the problem of inability to determine the content of irreducible water, and achieve significant effects and overcome core damage.
Active Publication Date: 2017-10-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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But for shale, the distribution of oil and gas in the pores is in a mixed state, and a single NMR T2 cutoff value cannot determine the irreducible water content
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[0029] The present invention will be further described below in conjunction with drawings and embodiments.
[0030] The method steps for determining the irreducible water content of shale by multi-state nuclear magnetic resonance measurement are as follows:
[0031] The first step is to measure NMR T2 spectrum of shale saturated oil.
[0032] The shale was collected and pre-cut. The cut shale had a diameter of 1 inch (2.54cm) and a length of 3cm-5cm, which was convenient for subsequent experimental measurements.
[0033] In order to reduce the measurement time and ensure the measurement quality, it is first necessary to optimize the NMR measurement parameters before the one-dimensional NMR T2 spectrum measurement. A piece of shale in the original state was selected to adjust different NMR measurement parameters. As shown in Table 1, in order to detect tiny pores, the minimum value of TE was adopted, that is, TE was 0.1 ms. The number of echoes NECH=(5000, 6000, 12000, 18000)...
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Abstract
The invention discloses a method for determining the bound water content of shale based on multi-state nuclear magnetic resonance measurement. Firstly, the shale is vacuum-pressurized and saturated with oil, and the one-dimensional NMR T2 spectrum is measured by optimizing the NMR measurement parameters. After oil washing and drying, the shale is vacuum-pressurized and saturated with water, and the one-dimensional NMR T2 is measured. Then select the best centrifugal force of the shale to centrifuge, and then measure the NMR T2 spectrum of the shale after centrifugation, put the shale in an oven for high-temperature drying, measure the background NMR T2 spectrum, and finally compare the four types of state NMR T2 Spectrum changes, analysis and calculation of shale irreducible water content. The invention overcomes the problems that the existing method for determining the irreducible water content of shale under laboratory conditions easily causes core damage and inaccurate calculation, and provides powerful help for the evaluation of unconventional reservoirs.
Description
technical field [0001] The invention relates to a method for calculating the irreducible water content in the logging field of the petroleum exploration and development industry, in particular to a method for determining the irreducible water content of shale. Background technique [0002] Due to the depletion of conventional oil and gas, unconventional oil and gas resources with huge resource potential have gradually become a research hotspot. Especially the breakthrough of shale oil and gas extraction technology in the United States, shale oil and gas reservoirs, as a kind of unconventional oil and gas reservoirs, have attracted more and more attention in recent years. Shale is both source rock and reservoir, and has the typical characteristics of "self-generation and self-storage" accumulation, and the reservoir space is complex, with primary pores, secondary pores and micro-fractures. Because shale oil and gas reservoirs are obviously different from conventional oil and...
Claims
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IPC IPC(8): G01N24/08
CPCG01N24/081G01N24/082Y02A90/30
Inventor 孙建孟李俊国闫伟超邵维志孙阳曾鑫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)