克孜勒努尔组深层煤层游离气含气饱和度计算

doi:10.11720/wtyht.2025.1415

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Abstract

Compared to shallow coal seams, deep coal seams have gradually transitioned into a complex geologic environment characterized by high temperatures, pressures, and in situ stresses, and low permeability. Temperature and other conditions result in enhanced negative adsorption effects, leading to free gas production. Free gas saturation serves as a typical parameter for predicting reserves and guiding the optimal design of production and drainage plans, rendering its accurate determination highly significant. This study investigated the coalbed methane in the Jurassic Kezilenuer Formation in the tectonic zone north of the Kuqa depression within the Tarim Basin. It calculated the free gas saturation in the target layer based on adsorption isotherms, field analysis, inversion, the element-modified bulk modulus method, and the Archie, Gassmann-Wood, and Gassmann-Brie equations. Furthermore, it comparatively analyzed the results derived from these calculation methods combined with two-dimensional nuclear magnetic resonance data. The results indicate that the element-modified bulk modulus method and the Gassmann-Wood and Gassmann-Brie equations are more appropriate calculation methods for the study area. Overall, the results of this study provide a valuable reference for calculating free gas saturation in deep coal seams in the study area, further guiding and advancing the exploration and production of deep coalbed methane.

Key words： deep coalbed methane free gas saturation Kezilenuer Formation two-dimensional nuclear magnetic resonance

Received: 10 October 2024 Published: 22 July 2025

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	Articles by authors
	Kang BIE
	Tian CAI
	Yi XIN
	Yue-Jiao LIU
	Chuang HAN
	Jian-Meng SUN

Cite this article:

Kang BIE,Tian CAI,Yi XIN, et al. Calculation of free gas saturation in deep coal seams in the Kezilenuer Formation[J]. Geophysical and Geochemical Exploration, 2025, 49(3): 578-587.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1415 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I3/578

Structural location (a) and structural outline (b) of the northern tectonic belt of Kuche Depression

Comparison of calculation results of free gas saturation by different methods^[28-29] GPa

Experimental results of isothermal adsorption and nuclear magnetic co-measurement of coal No.5 and No.8 in the study area

Two-dimensional nuclear magnetic experiment results of coal samples in the study area

2D NMR identification standard map and analytical gas statistics

Comparison chart of free gas saturation calculation results using different methods

The calculated results of free gas saturation in Well X of the study area

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