A method and system for calculating the permeability of coal and rock cleats

A permeability, coal rock technology, applied in the field of coalbed methane exploration and development, can solve the problem of permeability measurement without coal rock cleat

Active Publication Date: 2016-08-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Application Information

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Problems solved by technology

[0004] But at present, there is no better method to measure the cleat permeability of coal rocks

Method used

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  • A method and system for calculating the permeability of coal and rock cleats
  • A method and system for calculating the permeability of coal and rock cleats
  • A method and system for calculating the permeability of coal and rock cleats

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Experimental program
Comparison scheme
Effect test

Embodiment

[0102] (1) Select a series of coal core samples in the measurement area that can represent the characteristics of the region, conduct nuclear magnetic resonance experiments, and obtain the coal sample nuclear magnetic resonance T 2 Spectrum;

[0103] Because coal is fragile and difficult to obtain, this embodiment selects 8 coal core samples for nuclear magnetic resonance experiments, and obtains the nuclear magnetic resonance T of each coal core sample. 2 Spectrum, NMR T of some coal core samples obtained 2 Spectrum such as image 3 , Figure 4 and Figure 5 shown.

[0104] (2) Determine the NMR T 2 The cut-off value T of spectral cleat pores 2cutoff_c , to calculate the porosity φ of the NMR interval corresponding to the cleat pores of the coal sample c ;

[0105] According to the determined NMR T 2 The cut-off value T of spectral cleat pores 2cutoff_c , by the formula Calculate the NMR T of the coal sample 2 Spectral cleat porosity φ c ;

[0106] Among them, ...

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Abstract

The invention relates to the technical field of coalbed methane exploration and development and discloses a method and a system for calculating coal rock cleat permeability. According to the method and system for calculating coal rock cleat permeability provided in the invention, the method comprises the following steps: performing a nuclear magnetic resonance experiment on a coal core sample to obtain a nuclear magnetic resonance T2 spectrum, and calculating nuclear magnetic interval porosity Phi c which corresponds to the cleat porosity of the coal sample based on a cutoff value T2cutoff-c of the cleat porosity of the nuclear magnetic resonance T2 spectrum under different conditions; calculating the cleat width d based on transverse relaxation time T2 c which corresponds to a cleat porosity spectral peak under different conditions; and finally, calculating to obtain the cleat permeability k through a formula, so that the calculation of the coal rock cleat permeability is realized.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploration and development, and is mainly applicable to a method and a system for calculating the permeability of coal-rock cleats. Background technique [0002] Coalbed methane is a very important clean energy source in unconventional oil and gas. It has a large amount of resources, low degree of exploration, and great development potential. The exploration and development of coalbed methane is of great significance for increasing the effective supply of natural gas, improving the safe development and comprehensive utilization of coal and natural gas resources, and developing a green economy. In the process of coalbed methane exploration and development, the permeability of coal rock is one of the important indicators for the selection of coalbed methane exploration and development areas. The quality of coal-rock permeability directly affects the establishment of coalbed methane reservo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N24/08
Inventor 黄科夏朝辉万金彬苗秀英张兴阳张铭赵建斌杨福忠崔泽宏赵超斌杨勇丁伟刘玲莉汪萍杨玲王明方
Owner BC P INC CHINA NAT PETROLEUM CORP
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