Enlightenment of calcite veins in deep Ordovician Wufeng–Silurian Longmaxi shales fractures to migration and enrichment of shale gas in southern Sichuan Basin, SW China

被引：0
|
作者：
Cui Y. [1 ,2 ,3 ]
Li X. [1 ,2 ]
Guo W. [2 ]
Lin W. [4 ]
Hu Y. [2 ]
Han L. [5 ]
Qian C. [6 ]
Zhao J. [7 ]
机构：
[1] University of Chinese Academy of Sciences, Beijing
[2] Research Center of Sichuan Basin, PetroChina Research Institute of Petroleum Exploration & Development, Beijing
[3] Petroleum Industry Press Co., Ltd., Beijing
[4] Research Institute of Digital Geology and Energy, Linyi University, Linyi
[5] MOE Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Northeast Petroleum University, Daqing
[6] Shale Gas Exploration and Development Department, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu
[7] PetroChina Southwest Oil & Gas Field Company, Chengdu
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2023年 / 50卷 / 06期
关键词：
calcite vein; deep formation in southern Sichuan Basin; enrichment model; fluid inclusion; fracture; Ordovician Wufeng Formation; shale gas; Sichuan Basin; Silurian Longmaxi Formation;
D O I：
10.11698/PED.20230033
中图分类号：
学科分类号：
摘要：
The relationship between fracture calcite veins and shale gas enrichment in the deep Ordovician Wufeng Formation-Silurian Longmaxi Formation (Wufeng-Longmaxi) shales in southern Sichuan Basin was investigated through core and thin section observations, cathodoluminescence analysis, isotope geochemistry analysis, fluid inclusion testing, and basin simulation. Tectonic fracture calcite veins mainly in the undulating part of the structure and non-tectonic fracture calcite veins are mainly formed in the gentle part of the structure. The latter, mainly induced by hydrocarbon generation, occurred at the stage of peak oil and gas generation, while the former turned up with the formation of Luzhou paleouplift during the Indosinian. Under the influence of hydrocarbon generation pressurization process, fractures were opened and closed frequently, and oil and gas episodic activities are recorded by veins. The formation pressure coefficient at the maximum paleodepth exceeds 2.0. The formation uplift stage after the Late Yanshanian is the key period for shale gas migration. Shale gas migrates along the bedding to the high part of the structure. The greater the structural fluctuation is, the more intense the shale gas migration activity is, and the loss is more. The gentler the formation is, the weaker the shale gas migration activity is, and the loss is less. The shale gas enrichment in the core of gentle anticlines and gentle synclines is relatively higher. © 2023 Science Press. All rights reserved.
引用
收藏
页码：1199 / 1208
页数：9
相关论文
共 28 条
  • [1] MA Yongsheng, CAI Xunyu, ZHAO Peirong, China's shale gas exploration and development: Understanding and practice, Petroleum Exploration and Development, 45, 4, pp. 561-574, (2018)
  • [2] MA Xinhua, LI Xizhe, LIANG Feng, Et al., Dominating factors on well productivity and development strategies optimization in Weiyuan shale gas play, Sichuan Basin, SW China, Petroleum Exploration and Development, 47, 3, pp. 555-563, (2020)
  • [3] COX S F, ETHERIDGE M A, WALL V J., The role of fluids in syntectonic mass transport, and the localization of metamorphic vein-type ore deposists, Ore Geology Reviews, 2, pp. 65-86, (1987)
  • [4] SHEN Anjiang, ZHAO Wenzhi, HU Anping, Et al., The dating and temperature measurement technologies for carbonate minerals and their application in hydrocarbon accumulation research in the paleo-uplift in central Sichuan Basin, SW China, Petroleum Exploration and Development, 48, 3, pp. 476-487, (2021)
  • [5] LI Jianzhong, BAI Bin, BAI Ying, Et al., Fluid evolution and hydrocarbon accumulation model of ultra-deep gas reservoirs in Permian Qixia Formation of northwest Sichuan Basin, SW China, Petroleum Exploration and Development, 49, 4, pp. 627-636, (2022)
  • [6] LI Zhen, YANG Peng, LIU Keyu, LI Zhen, Et al., Evolution of Ordovician YJ1X ultra-deep oil reservoir in the Yuecan oilfield, Tarim Basin, NW China, Petroleum Exploration and Development, 49, 2, pp. 262-273, (2022)
  • [7] JIANG Zhenxue, SONG Yan, TANG Xianglu, Et al., Controlling factors of marine shale gas differential enrichment in southern China, Petroleum Exploration and Development, 47, 3, pp. 617-628, (2020)
  • [8] WU Jianfa, ZHAO Shengxian, FAN Cunhui, Et al., Fracture characteristics of the Longmaxi Formation shale and its relationship with gas-bearing properties in Changning area, southern Sichuan, Acta Petrolei Sinica, 42, 4, pp. 428-446, (2021)
  • [9] BORJIGIN Tenger, SHEN Baojian, YU Lingjie, Et al., Mechanisms of shale gas generation and accumulation in the Ordovician Wufeng-Longmaxi Formation, Sichuan Basin, SW China, Petroleum Exploration and Development, 44, 1, pp. 69-78, (2017)
  • [10] NIE Haikuan, LI Pei, DANG Wei, Et al., Enrichment characteristics and exploration directions of deep shale gas of Ordovician-Silurian in the Sichuan Basin and its surrounding areas, China, Petroleum Exploration and Development, 49, 4, pp. 648-659, (2022)
123