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Method for extracting sensitive parameters of T2 spectrum based on nuclear magnetic resonance logging

A technology of nuclear magnetic resonance and extraction method, which is applied in the field of nuclear magnetic resonance experiment and nuclear magnetic resonance logging, mercury injection, and core physical properties, and can solve problems such as pore structure information distortion

Active Publication Date: 2018-12-07
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0021] This technology is useful for obtaining pore size distribution curves in oil-bearing formations, but there are still some shortcomings. (1) Errors in the process of establishing pseudo-capillary pressure curves can easily cause distortion of pore structure information; (2) Correspondingly complicated conversion methods For complex underground environments, its application will have greater limitations

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  • Method for extracting sensitive parameters of T2 spectrum based on nuclear magnetic resonance logging
  • Method for extracting sensitive parameters of T2 spectrum based on nuclear magnetic resonance logging
  • Method for extracting sensitive parameters of T2 spectrum based on nuclear magnetic resonance logging

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Embodiment Construction

[0069] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0070] NMR T of cores with the same porosity and different permeability 2 spectrum

[0071] Comparing the NMR T of cores with the same porosity and different permeability 2 It is found that the transverse relaxation time corresponding to the peak value is obviously different. When the porosity is 7%, the sample A1 (2.6mD) with high permeability has a final peak time of 80ms, and the sample B1 (0.43mD) with low permeability has the same The final peak time is 8ms ( figure 1 a); when the porosity is all 11%, the sample A2 (10.2mD) with high permeability has a final peak time of 350ms, and the sample B2 (1.06mD) with low permeability has a final peak time of 15ms ( figure 1 b) when the porosity is all 12%, the sample A3 (3.18mD) with high permeability h...

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Abstract

The invention discloses a method for extracting sensitive parameters of T2 spectrum based on nuclear magnetic resonance logging, and the method includes the following steps: S1, performing rock sampleanalysis and testing; S2, respectively performing physical property tests, nuclear magnetic resonance experiments and high pressure mercury injection; and S3, based on a MATLAB programming platform and by use of peak picking and quantity judgment, peak value picking and sequence sorting, waveform judgment and invalid peak screening, first and last peak judgment and sequence cycle calculation andother information statistics, extracting thirteen sensitive parameters from morphological features of the T2 spectrum. The advantages of the method are as follows: the information of the nuclear magnetic resonance T2 spectrum deeply dug and extracted, and the method is helpful for quantitative evaluation of formation pore structure by the nuclear magnetic resonance logging, and deepens he application of the nuclear magnetic resonance logging in pore structure evaluation of tight sandstone reservoirs.

Description

technical field [0001] The invention relates to the technical fields of core physical properties, mercury injection, nuclear magnetic resonance experiments and nuclear magnetic resonance logging, and in particular to a T 2 Spectral Sensitive Parameter Extraction Method. Background technique [0002] With the continuous advancement of oil and gas exploration and development, the difficulty of exploration is also increasing, and the demand for oil and gas continues to rise. Conventional oil and natural gas are gradually unable to meet the demand. At present, low-permeability and tight oil and gas have become an important strategic alternative energy source (Zhao Xinzhi. Longdong, Ordos Basin Regional low permeability reservoir characteristics and classification evaluation [D]. 2012, Wuhan: China University of Geosciences.). A large number of practical results in engineering show that the pore structure of reservoir rock significantly affects its storage and seepage capacity, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08G01N15/08
CPCG01N15/088G01N24/081
Inventor 闫建平何旭冯春珍王敏耿斌张少龙范杰黄林林
Owner SOUTHWEST PETROLEUM UNIV
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