川东北元坝—通南巴地区二叠系—三叠系天然气地球化学特征及成因

doi:10.7623/syxb201403002

石油学报 ›› 2014, Vol. 35 ›› Issue (3): 417-428.DOI: 10.7623/syxb201403002

川东北元坝—通南巴地区二叠系—三叠系天然气地球化学特征及成因

刘景东^1,2, 刘光祥², 王良书³, 吴小奇²

1. 中国石油大学地球科学与技术学院山东青岛 266580;
2. 中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所江苏无锡 214126;
3. 南京大学地球科学系江苏南京 210093

收稿日期:2013-09-27 修回日期:2013-12-16 出版日期:2014-05-25 发布日期:2014-04-11
通讯作者: 刘景东，男，1984年9月生，2006年获中国石油大学（华东）学士学位，2011年获中国石油大学（华东）博士学位，现为中国石油大学（华东）地球科学与技术学院油气资源系讲师，主要从事石油地质学教学与科研工作。Email：ljd840911@126.com
作者简介:刘景东，男，1984年9月生，2006年获中国石油大学（华东）学士学位，2011年获中国石油大学（华东）博士学位，现为中国石油大学（华东）地球科学与技术学院油气资源系讲师，主要从事石油地质学教学与科研工作。Email：ljd840911@126.com
基金资助:
国家重大科技专项（2011ZX05005）、国家自然科学基金项目（No.41302118）和中央高校基本科研业务费专项资金项目（14CX02116A）资助。

Geochemical characteristics and origin of Permian and Triassic natural gas in Yuanba-Tongnanba area, northeastern Sichuan Basin

Liu Jingdong^1,2, Liu Guangxiang², Wang Liangshu³, Wu Xiaoqi²

1. School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2. Wuxi Research Institute of Petroleum Geology, Sinopec Research Institute of Petroleum Exploration and Production, Wuxi 214126, China;
3. Department of Earth Sciences, Nanjing University, Nanjing 210093, China

Received:2013-09-27 Revised:2013-12-16 Online:2014-05-25 Published:2014-04-11

摘要/Abstract

摘要：

依据天然气组分、碳同位素和稀有气体等资料对川东北元坝—通南巴地区二叠系—三叠系天然气地球化学特征及成因进行了系统研究。结果表明，（H₂S+CO₂）与（H₂S+CO₂+∑C_n）比值可以作为表征热化学硫酸盐还原作用（TSR）程度的参数。元坝地区长兴组至须家河组二段、通南巴地区飞仙关组至须家河组四段天然气δ¹³C₂变化幅度大于δ¹³C₁，且δ¹³C₂值介于-24.4 ‰ ~-36.7 ‰，表明存在油型气和煤型气混合，理论上各层系天然气碳同位素均应呈倒序分布，但元坝地区长兴组、飞仙关组和通南巴地区嘉陵江组天然气受TSR影响，仍表现为δ¹³C₁<δ¹³C₂或δ¹³C₁<δ¹³C₂<δ¹³C₃的正序分布。元坝地区须家河组三段、四段天然气δ¹³C₂值大多重于-28 ‰，以煤型气为主，表现为δ¹³C₁<δ¹³C₂<δ¹³C₃的正序分布。天然气稀有气体氦同位素R/R_a值分布于0.00881~0.02510，表现出典型的壳源特征，源于TSR的酸性气体和源于烃源岩热演化的有机酸对碳酸盐岩的溶蚀是该地区二氧化碳形成以及δ¹³C_CO₂变重的主要原因。气-气及气-源综合对比表明，元坝—通南巴地区天然气成因类型可以划分为龙潭型（A1型）、混合型（A2型）和须家河型（B型），龙潭型和混合型主要来源于上二叠统龙潭组烃源岩，其中混合型混有少量须家河组来源气，须家河型主要来源于其自身层系的烃源岩。

关键词: 天然气成因, 碳同位素, 热化学硫酸盐还原作用(TSR), 二叠系—三叠系, 元坝—通南巴地区

Abstract:

Based on the data of gas composition, carbon isotope and noble gas, a systematic study is conducted on geochemical characteristics and origin of Permian and Triassic natural gas in Yuanba-Tongnanba area of northeastern Sichuan Basin. The results indicate that the ratio of (H₂S+CO₂) and (H₂S+CO₂+∑C_n) can be used as a parameter for representing thermochemical sulfate reduction (TSR) level. The variation range of δ¹³C₂ is wider than that of δ¹³C₁ for gas from Changxing Formation to Member II of Xujiahe Formation in Yuanba area, as well as Feixianguan Formation to Member IV of Xujiahe Formation in Tongnanba area. δ¹³C₂ values range from -24.4 ‰ to -36.7 ‰, indicating that there exists a mixture of oil-type gas and coal-type gas. On a theoretical level, the distribution of carbon isotopes in all strata series shows a reverse sequence. However, affected by TSR, gas from Changxing and Feixianguan Formations in Yuanba area and Jialingjiang Formation in Tongnanba area has a positive sequence of δ¹³C₁<δ¹³C₂ and δ¹³C₁<δ¹³C₂ <δ¹³C₃. δ¹³C₂ values are always greater than -28 ‰ for gas from Members III and IV of Xujiahe Formation in Yuanba area, mainly indicating coal-type gas with the positive sequence of δ¹³C₁<δ¹³C₂<δ¹³C₃. According to the helium isotope analysis of gas and noble gas, R/R_a values range from 0.008 81 to 0.025 10, showing a typical crust source type. Carbonate dissolution by acid gases and organic acids respectively though TSR and thermal evolution of source rock plays a main role in causing CO₂ generation and increased δ¹³C_CO₂. Based on a comprehensive comparison analysis of gas-gas and gas-source rock data, origin types of gas in Yuanba-Tongnanba area can be divided into Longtan (A1), mixed (A2) and Xujiahe (B). Of these, A1 and A2 mainly originate from source rock in the Upper Permian Longtan Formation, and A2 is mixed with some gas from source rock of the Xujiahe Formation; B is mainly from source rock in the Xujiahe Formation.

Key words: gas origin, carbon isotope, thermochemical sulfate reduction (TSR), Permian-Triassic, Yuanba-Tongnanba area

中图分类号:

TE122

刘景东, 刘光祥, 王良书, 吴小奇. 川东北元坝—通南巴地区二叠系—三叠系天然气地球化学特征及成因[J]. 石油学报, 2014, 35(3): 417-428.

Liu Jingdong, Liu Guangxiang, Wang Liangshu, Wu Xiaoqi. Geochemical characteristics and origin of Permian and Triassic natural gas in Yuanba-Tongnanba area, northeastern Sichuan Basin[J]. ACTA PETROLEI SINICA, 2014, 35(3): 417-428.

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川东北元坝—通南巴地区二叠系—三叠系天然气地球化学特征及成因

Geochemical characteristics and origin of Permian and Triassic natural gas in Yuanba-Tongnanba area, northeastern Sichuan Basin

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