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西昌盆地五峰组—龙马溪组页岩气保存条件研究

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文章导航 > 沉积与特提斯地质 > 2021 > 41(3): 465-476

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李桃, 杨贵来, 何伟, 陈杨, 周瑞琦, 牟必鑫, 魏洪刚. 2021. 西昌盆地五峰组—龙马溪组页岩气保存条件研究. 沉积与特提斯地质, 41(3): 465-476. doi: 10.19826/j.cnki.1009-3850.2021.07003
引用本文: 李桃, 杨贵来, 何伟, 陈杨, 周瑞琦, 牟必鑫, 魏洪刚. 2021. 西昌盆地五峰组—龙马溪组页岩气保存条件研究. 沉积与特提斯地质, 41(3): 465-476. doi: 10.19826/j.cnki.1009-3850.2021.07003
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LI Tao, YANG Guilai, HE Wei, CHEN Yang, ZHOU Ruiqi, MU Bixin, WEI Honggang. 2021. Preservation condition for shale gas of Wufeng-Longmaxi Formations in Xichang Basin. Sedimentary Geology and Tethyan Geology, 41(3): 465-476. doi: 10.19826/j.cnki.1009-3850.2021.07003
Citation: LI Tao, YANG Guilai, HE Wei, CHEN Yang, ZHOU Ruiqi, MU Bixin, WEI Honggang. 2021. Preservation condition for shale gas of Wufeng-Longmaxi Formations in Xichang Basin. Sedimentary Geology and Tethyan Geology, 41(3): 465-476. doi: 10.19826/j.cnki.1009-3850.2021.07003
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西昌盆地五峰组—龙马溪组页岩气保存条件研究

  • 1. 四川省煤田地质工程勘察设计研究院, 四川 成都 610072;

  • 2. 页岩气评价与开采四川省重点实验室, 四川 成都 610091;

  • 3. 中国地质调查局成都地质调查中心, 四川 成都 610081

  • 基金项目:

    四川省重大项目“西昌盆地页岩气资源调查评价和区块优选”（DK-2017-F-008）；四川省科技基金项目“西昌盆地构造特征及页岩气保存条件研究”（2018JY0625）

详细信息
    作者简介: 李桃(1989-),女,工程师,主要从事石油地质调查与评价。E-mail:569111244@qq.com
    通讯作者: 杨贵来(1984-),男,工程师,主要从事石油地质调查与评价。E-mail:1799744480@qq.com

  • 中图分类号: P618.13

Preservation condition for shale gas of Wufeng-Longmaxi Formations in Xichang Basin

  • 1. Sichuan Institute of Coal Field Geological Engineering Exploration and Designing, Chengdu 610072, China;

  • 2. Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan Province, Chengdu 610091, China;

  • 3. Chengdu Center, China Geological Survey, Chengdu 610081, China

More Information

    摘要
  • 保存条件是影响页岩气富集高产的关键因素。本文综合利用地质、钻井等资料，分析了西昌盆地五峰组-龙马溪组的顶底板条件、构造特征、地层压力特征和气体组分，从宏观和微观两个方面对影响页岩气保存的主要指标进行了研究，在此基础上开展了西昌盆地保存条件综合评价。结果表明：盆地各凹陷主要由走滑-冲断带相隔，凹陷内地层缓倾，构造样式表现为宽缓-开阔褶皱，由于受到盆缘断裂冲断作用的影响，盆缘褶皱常表现为紧闭-闭合褶皱，地层近于直立，局部发生倒转；西昌盆地内部构造缩短量较少，缩短率均<20%，指示整个盆地内部构造变形强度较弱；盆地南部布拖区域，龙马溪组页岩可形成典型压力封存箱式地质结构，箱内与箱外存在一定压力系数差，箱内地层压力稳定，保存条件好；综合多期构造作用下的断裂和裂缝发育状况、隆升剥蚀、构造变形条件等因素，在西昌盆地东缘优选出昭觉和布拖两个页岩气有利区。
    In this paper, based on data of drilling wells and geological survey, the main factors affecting the preservation of shale gas such as the lithological conditions of roof and floor rocks, strucure conditions, pressure conditions, and gas components of the Wufeng-Longmaxi Formations in Xichang Basin are detailedly studied from both macro and micro aspects. The results show that the depressions in Xichang Basin are separated by strike-slip belts or thrust belts. Strata within depressions are gently dipping, usually developing broad, slow and open folds. Due to activities of thrust faults in basin margins, folds usually appear as tight folds and strata are often nearly upright or even overturned in basin margins. Within Xichang Basin, tectonic deformation is weak. Shale rocks of Longmaxi Formation in Butuo, which is located in the southern Xichang Basin, have formed the typical pressure sealing box-type geological structure which is propitious to shale gas. Based on an overall consideration of structural deformation conditions of fault, fracture, uplifting and the erosion of Xichang Basin, it is suggested that Zhaojue and Butuo are two favorable areas for shale gas in the eastern edge of Xichang Basin.
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收稿日期:  2021-04-25
修回日期:  2021-07-08

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