四川盆地长宁地区深层煤层气成藏特征与勘探潜力

doi:10.13809/j.cnki.cn32-1825/te.2025.02.004

Abstract

Abstract:

The Sichuan Basin is rich in coalbed methane resources, and shallow coalbed methane in the Junlian area has been commercially developed. In the adjacent Changning area, multiple drilling wells have tested and obtained gas in the Permian coal seam, revealing significant potential for coalbed methane in the Sichuan Basin. With significant breakthrough in the exploration and development of deep coalbed methane in China, and drawing from experiences in the Qinshui Basin and the Ordos Basin, a comprehensive study was conducted to assess the resource potential of deep coalbed methane in the Changning area. This study utilized data from logging, coal seam coring, and experimental testing to analyze the geology of the coal seams, evaluate gas-bearing properties, and investigate the main factors influencing reservoir formation and favorable zones. The study found that the 7th and 8th coal seams in the study area are thick, regionally stable, and high-quality, mainly composed of primary structural coals with high rank and high fixed carbon content. These seams are at the peak of pyrolysis gas generation, suggesting significant hydrocarbon generation potential. Coal seams have characteristics of high porosity, high permeability, and high cleat density, providing ample storage space, while the coal seam roof and floor—predominantly mudstone—offer excellent preservation conditions. Compared to the shallow coalbed methane in Junlian, the deep coalbed methane in the Changning area features a more stable structure, a higher proportion of free gas, and a more intact coal matrix. Coalbed methane reservoirs are formed in the target area far from erosion boundary and Class Ⅰ fault zones. The abundant free gas is more conducive to subsequent development. Based on geo-engineering conditions, a dual geo-engineering “sweet spot” index system for evaluating coalbed methane in the Changning area has been established. A favorable deep coalbed methane development area of 1 300 km² has been identified, with a calculated resource volume of 1 700×10⁸ m³, primarily located in the Luochang and Jianwu synclines. The research results have effectively guided the deployment of coalbed methane wells in the region, contributing to the high-quality development of unconventional natural gas in the Sichuan Basin.

Key words: Sichuan Basin, Changning area, deep coalbed methane, accumulation characteristic, geo-engineering “sweet spot”

CLC Number:

TE37

YANG Xue,TIAN Chong,YANG Yuran, et al. Accumulation characteristics and exploration potential of deep coalbed methane in Changning area of Sichuan Basin[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(2): 194-204.

Figures/Tables 10

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井号	煤层深度/m	煤层累计厚度（开发煤层）/m	初期日产气量/m³	累计产气量/10⁴ m³
N210	738.00	2.99	3 122	45.00
川高参1	805.61	5.02	8 307	226.00
川高参2	868.00	6.22	3 626	56.64
川高2	834.00	5.10	1 500
FB-1	682.80	8.55	1 750
FB-2	817.50	1.95	829
FB-3	753.80	6.20	1 896
N216H19-3	730.00	4.00	832

类型	地质“甜点”区						工程“甜点”区
类型	构造	煤层厚度/m	含气量/(m³/t)	距I级断层距离/m	距剥蚀线距离/m	气测峰值/%	底板岩性	顶板岩性	夹层岩性	煤体结构	可压性（裂隙发育程度）	埋深
Ⅰ类	构造平缓带，地层倾角小于3°，改造弱	≥5	>15	>1 500	>600	≥50	脆性指数小于30的页岩、泥岩、灰岩	页岩	页岩	原生-碎裂	割理裂隙发育	风化带至3 000 m
Ⅱ类	构造平缓带，地层倾角介于3°~8°，改造不强烈	3~<5	>8~15	700~1 500	200~600	<50	脆性指数大于30的砂质泥岩、砂岩	泥岩、薄灰岩	泥岩	碎裂	割理裂隙发育差
Ⅲ类	构造平缓带，地层倾角大于8°，改造较强烈	2~<3	>4~8	<700	<200	<50	脆性指数大于30的砂质泥岩、砂岩	厚灰岩	泥岩	碎裂-碎粒	割理裂隙发育差

Accumulation characteristics and exploration potential of deep coalbed methane in Changning area of Sichuan Basin

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