Layer-selecting T2 relaxation spectrum rapid testing method for porous medium

A technology of porous media and testing methods, applied to measuring devices, instruments, and nuclear magnetic resonance analysis, etc., can solve problems such as difficult to obtain the change law of physical parameters of rock cores, inability to reflect the difference of rock cores, bedding superposition, etc.

Inactive Publication Date: 2020-12-25
PEKING UNIV +1
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Problems solved by technology

[0003] Porous media often have a certain degree of heterogeneity, especially samples with low porosity and low permeability, which have chaotic and complex structures and serious bedding superposition. Without spatial information, the heterogeneity of the whole core is often ignored, which cannot reflect the huge differences inside the core, and it is difficult to accurately describe the core information. Therefore, it is difficult to obtain the change law of physical parameters at different positions of the core by using existing methods

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  • Layer-selecting T2 relaxation spectrum rapid testing method for porous medium
  • Layer-selecting T2 relaxation spectrum rapid testing method for porous medium
  • Layer-selecting T2 relaxation spectrum rapid testing method for porous medium

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0043] In the present invention, by designing a T2 relaxation spectrum test pulse sequence with a layer selection function, under a constant layer selection gradient, the CPMG pulse sequence is used to simultaneously perform layer selection coding on the spatial position points, and realize the nuclear magnetic resonance T2 relaxation at different positions in the porous medium. The test and analysis of the prediction spectrum can obtain the physical parameter characteristics of different positions of the porous medium, which can be used for the T2 relaxation spectrum of the different layer selection positions of the porous medium test sample.

[0044] Embodiment A sandstone core is selected as a porous medium test sample, the porosity is 15.8%, the permeability is 8 mD, and the core is in the shape o...

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Abstract

The invention discloses a layer-selecting T2 relaxation spectrum rapid testing method for a porous medium. According to the device, a T2 relaxation spectrum test pulse sequence with a layer-selectingfunction is designed, and under a constant layer-selecting gradient, layer-selecting coding is simultaneously conducted on spatial position points by using a CPMG pulse sequence, so that test analysisof nuclear magnetic resonance T2 relaxation spectrums at different layer-selecting positions in the porous medium is realized, and physical property parameter characteristics of different positions of the porous medium can be obtained.

Description

technical field [0001] The invention belongs to the technical field of nuclear magnetic resonance, and relates to a rapid testing method for layer-selected T2 relaxation spectrum of porous media. Background technique [0002] NMR T2 relaxation spectrum technology has the advantages of fast, non-destructive, non-polluting, and the same number of test parameters. At present, as the main test method for porous media, it is widely used in petroleum exploration and development, coalbed methane storage and migration, and cement building materials. In terms of analysis, rock soil and frozen soil testing, etc., during the NMR test, the CPMG NMR pulse sequence is used to test the echo train signal generated by the fluid in the sample, and the T2 relaxation spectrum is obtained by mathematical inversion of the echo train signal , the sample is excited as a whole during analysis, and the porosity, permeability, oil saturation, water saturation, gas saturation, movable fluid distributio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 王为民马德铭朱涛涛丁耀
Owner PEKING UNIV
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