Accumulation conditions and favorable exploration zones for natural gas in 8000 meters marine ultra- deep strata in the Sichuan basin

被引：0

作者：

Huang S. ^{[1
]}

Jiang H. ^{[1
]}

Wang T. ^{[1
]}

Wen L. ^{[2
]}

Guan S. ^{[1
]}

Zeng F. ^{[1
]}

Zhu G. ^{[1
]}

Tian X. ^{[2
]}

Zhang T. ^{[3
]}

机构：

[1] PetroChina Research Institute of Petroleum Exploration and Development, Beijing

[2] PetroChina Southwest Oil and Gas Field, Sichuan, Chengdu

[3] China University of Mining and Technology (Beijing, Beijing

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 05期

关键词：

favorable exploration zone; marine facies; Paleozoic; reservoir forming conditions; Sichuan basin; Sinian; ultra- deep layer with depth more than 8000 m;

D O I：

10.19762/j.cnki.dizhixuebao.2023228

中图分类号：

学科分类号：

摘要：

The ultra- deep layer with depth >6000 m is a major field of global oil and gas exploration. At present, the gas exploration in Sichuan basin has broken through the 8000 m ultra- deep layer, but the scientific questions such as whether the 8000 m ultra- deep field in the basin has the conditions for large- scale gas field accumulation, and where the favorable exploration zones are distributed have not been clearly answered. Based on the study of source rocks, favorable facies zone, reservoir, trap types, and reservoir forming assemblages, the reservoir forming conditions and favorable exploration zones in the 8000 m ultra- deep strata of Sichuan basin were evaluated in detail, and the following conclusions were obtained: (1) the ultra- deep strata of Sichuan basin is mainly developed in the Sinian- Middle Permian, and is mainly distributed in the deep western depression, northern depression and the fold belt in eastern Sichuan. Among them the western depression has the largest exploration potential; (2) the ultra- deep source rocks are obviously controlled by depressions or intra platform rifts, and mainly develop four sets of source rocks, including Doushantuo Formation (Fm), third Member of Dengying Fm, Maidiping Fm and Qiongzhusi Fm, which provide an abundant material basis for 8000 m ultra- deep gas exploration; (3) there are three basic reservoir types in the main body of Sinian- Paleozoic layer, the beach (mound) controlling porous type, karst vuggy type and dolomite porous type, which are superimposed with each other and combined with fracture altered to form large- scale multiple reservoir layers, providing favorable reservoir conditions for ultra- deep gas exploration; (4) many sets of source rocks and reservoirs communicate with each other by strike slip or thrust faults, and mainly develop two kinds of reservoir forming combinations of lower source and upper reservoir, and paraegenic and lateral reservoir assemblages forming obvious three- dimensional reservoir characteristics; (5) lithologic trap is the main trap type of ultra- deep Sinian- Permian gas reservoir in the Sichuan basin, and the structural- lithologic trap formed by anticline or nose structure superimposed lithologic body developed on the background of large slope is also an important exploration object; (6) 9 favorable exploration zones in 6 major fields, with a cumulative exploration area of more than 45000 km 2 are developed in the ultra- deep strata with depth more than 8000 m, and a resource volume of about 3×10 12~5×10 12m3 was predicted. The research of this work is of great theoretical and practical significance for the ultra- deep natural gas exploration in Sichuan basin. © 2023 Geological Society of China. All rights reserved.

引用

页码：1544 / 1560

页数：16

共 54 条

[1] Cai Xuyu, Liu Jinlian, Zhang Yu, Peirong Zhao, Chaoying Liu, Zhe Cheng, Tong Zhu, Huaming Xu, Oil and gas exploration progress of Sinopec during the 13th Five-year plan period and prospect forecast for the 14th five-year plan, China Petroleum Exploration, 26, 1, pp. 31-42, (2021)
[2] Dai Jinxing, Ni Yunyan, Qin Shengfei, Huang Shipeng, Peng Weilong, Han Wenxue, Geochemical characteristics of ultra-deep natural gas in the Sichuan basin, SW China, Petroleum Exploration and Development, 45, 4, pp. 588-597, (2018)
[3] Dai Jinxing, Yunyan Ni, Liu Quanyou, Wu Xiaoqi, Gong Deyu, Feng Hong, Zhang Yanling, Fengrong Liao, Yan Zengmin, Li Hongwei, Sichuan super gas basin in southwest China, Petroleum Exploration and Development, 48, 6, pp. 1081-1088, (2021)
[4] Jinhu Du, Geological Theory and Exploration Practice of Ancient Carbonate Gas Fields, pp. 1-227, (2015)
[5] Du Jinhu, Zou Caineng, Xu Chunchun, He Haiqing, Shen Ping, Yang Yueming, Li Yalin, Wei Guoqi, Wang Zecheng, Yang Yu, Theoretical and technical innovations in strategic discovery of a giant gas field in Cambrian Longwangmiao Formation of central Sichuan paleo-uplift, Sichuan basin, Petroleum Exploration and Development, 41, 3, pp. 268-277, (2014)
[6] Guan Shuwei, Liang Han, Jiang Hua, Fu Xiaodong, Gu Mingfeng, Lei Ming, Chen Tao, Yang Rongjun, Characteristics and evolution of the main strike-slip fault belts of the central Sichuan basin, Earth Science Frontiers, 29, 6, pp. 252-264, (2022)
[7] Guo Xusheng, Hu Dongfeng, Li Yuping, Duan Jinbao, Ji Chunhui, Duan Hua, Discovery and theoretical and technical innovations of Yuanba gas field in Sichuan basin, SW China, Petroleum Exploration and Development, 45, 1, pp. 14-26, (2018)
[8] He Dengfa, Yingqiang Li, Hanyu Huang, Jian Zhang, Renqi Lu, Li Di, Formation, Evolution and Hydrocarbon Accumulation of Sichuan Multicycle Superimposed Basin, pp. 1-569, (2020)
[9] He Zhiliang, Li Shuangjian, Liu Quanyou, Yang Tianbo, Zhang Ying, Deep geological processes and deep resources in basins: Scientific issues and research directions, Petroleum Geology & Experiment, 42, 5, pp. 767-779, (2020)
[10] Huang Shipeng, Jiang Qingchun, Wang Zecheng, Wang Su, Feng Qingfu, Feng Ziqi, Differences between the Middle Permian and Maokou source rocks in the Sichuan basin, Natural Gas Industry, 36, 12, pp. 26-34, (2016)

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