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Coalbed gas content analysis method based on nuclear magnetic resonance T2 spectrum

A technology of nuclear magnetic resonance and analysis methods, which is applied in the fields of analysis by nuclear magnetic resonance, material analysis through resonance, and material analysis, etc. It can solve the problems of complex nonlinear geological and geophysical response characteristics and inapplicability, and achieve social and economic benefits. Obvious effect

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] Compared with traditional sandstone and other reservoirs, coal rocks in unconventional formations have complex nonlinear geological and geophysical response relationship characteristics, and conventional reservoir rock physical identification analysis methods and evaluation models are not applicable to the identification and evaluation of unconventional reservoirs , unconventional strata corresponding to coal-rock NMR petrophysical analysis faces many problems and challenges, and is still in the exploratory stage at home and abroad

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  • Coalbed gas content analysis method based on nuclear magnetic resonance T2 spectrum
  • Coalbed gas content analysis method based on nuclear magnetic resonance T2 spectrum
  • Coalbed gas content analysis method based on nuclear magnetic resonance T2 spectrum

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Embodiment Construction

[0026] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0027] refer to figure 1 The coal seam gas content analysis method based on nuclear magnetic resonance T2 spectrum according to an exemplary embodiment of the present invention is described in detail. The method mainly includes:

[0028] Step 1: Carry out nuclear magnetic resonance petrophysical testing on a full-diameter coal rock sample in an unconventional formation, and obtain the T2 spectrum of the sample.

[0029] In one example, NMR petrophysical testing was performed on full...

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Abstract

The invention provides a coalbed gas content analysis method based on a nuclear magnetic resonance T2 spectrum. The method comprises the steps that 1) nuclear magnetic resonance rock physics testing is carried out on a full-diameter coal rock sample of an unconventional formation to acquire the T2 spectrum of the sample; 2) a movable fluid peak and a bound fluid peak are determined based on the T2spectrum of the sample; 3) the relationship between the ratio of the area enclosed by the bound fluid peak to the area enclosed by the movable fluid peak and the percentage of a movable fluid is established; and 4) the relationship between the percentage of the movable fluid and the gas content of a reservoir is established by comparing the T2 spectrum of different samples with the measured gas content of the reservoir. According to the invention, the unique double-pore structure characteristics of a coalbed gas reservoir is disclosed through the distribution analysis of the full-diameter coal core nuclear magnetic resonance T2 value of the unconventional coal rock formation, and key factors determining the gas content of coal rock are proposed. The method provided by the invention provides a basis for a logging formation interpretation method, and has obvious social and economic benefits.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas exploration and development, and more specifically, relates to a coal seam gas content analysis method based on nuclear magnetic resonance T2 spectrum. Background technique [0002] Compared with traditional sandstone and other reservoirs, coal rocks in unconventional formations have complex nonlinear geological and geophysical response relationship characteristics, and conventional reservoir rock physical identification analysis methods and evaluation models are not applicable to the identification and evaluation of unconventional reservoirs , unconventional strata corresponding to coal-rock NMR petrophysical analysis faces many problems and challenges, and it is still in the exploration stage at home and abroad. Therefore, it is necessary to develop an NMR analysis method for coal rocks in unconventional formations. [0003] The information disclosed in the background of the present in...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081G01N24/082Y02A90/30
Inventor 张松扬秦绪英刘卫华薛诗桂
Owner CHINA PETROLEUM & CHEM CORP
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