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2022 , Vol. 45 >Issue 3: 1 - 10

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2022.03.001

资源勘探

四川盆地东北部茅口组岩溶储层控制因素

  • 曹华 ,
  • 陈延贵 ,
  • 陈聪 ,
  • 高兆龙 ,
  • 山述娇 ,
  • 李天军 ,
  • 胡罗嘉 ,
  • 谢静平
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  • 中国石油西南油气田公司勘探开发研究院
曹华,男,1981年生,高级工程师,硕士;目前从事碳酸盐岩天然气地质研究工作。地址：（610041）四川省成都市高新区天府大道北段12号。E-mail：chua2018@petrochina.com.cn

修回日期: 2022-07-07

  网络出版日期: 2022-11-07

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Controlling factors of karst reservoir in Maokou Formation, northeastern Sichuan Basin

  • Cao Hua ,
  • Chen Yangui ,
  • Chen Cong ,
  • Gao Zhaolong ,
  • Shan Shujiao ,
  • Li Tianjun ,
  • Hu Luojia ,
  • Xie Jingping
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  • Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China

Revised date: 2022-07-07

  Online published: 2022-11-07

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摘要

四川盆地东北部中二叠统茅口组岩溶储层分布非均质性强,已发现气藏具有“一井一藏”的特点,储层发育控制因素认识不清,从而制约了该地区茅口组勘探。在对研究区构造背景、火山岩分布、古地貌、古气候综合分析的基础上,结合野外地质观测、岩心观察、薄片鉴定及地震资料解释,系统分析了该地区的岩溶控制因素。结果表明：①研究区发育一套孤峰组深水相沉积,岩性为硅质岩、硅质页岩及页岩,为茅口组同期异相产物,孤峰组沉积具有穿时性,沉积时间北早南晚,由于其渗透性和可溶性差,对大气水下渗产生岩溶起到了封隔作用;②东吴运动使得研究区抬升暴露地表,遭受大气水溶蚀改造,是茅口组岩溶储层形成的必要因素;③火山活动过程中形成拉张断裂系统,为大气水通过孤峰组硅质-泥质岩下渗产生溶蚀作用提供了通道,是茅口组岩溶储层形成的主控因素;④由于孤峰组难溶性岩层的存在,使得孤峰组覆盖区古地貌非常平缓,古地貌对岩溶储层影响微弱;⑤炎热潮湿的古气候为岩溶储层发育提供了充足的外部营力。

关键词： 四川盆地东北部; 中二叠世; 茅口组; 孤峰组; 岩溶储层; 控制因素

本文引用格式

曹华 , 陈延贵 , 陈聪 , 高兆龙 , 山述娇 , 李天军 , 胡罗嘉 , 谢静平 . 四川盆地东北部茅口组岩溶储层控制因素[J]. 天然气勘探与开发, 2022 , 45(3) : 1 -10 . DOI: 10.12055/gaskk.issn.1673-3177.2022.03.001

Abstract

The karst reservoir of Middle Permian Maokou Formation in northeastern Sichuan Basin is highly heterogeneous. The discovered reservoirs are characterized by "one well one reservoir". The unclear controlling factors of such reservoirs limit the exploration in this area. Based on the comprehensive analysis of tectonic setting, volcanic distribution, paleogeomorphology and paleoclimate, together with field geological survey, core observation, thin section examination and seismic interpretation, the factors controlling karst reservoirs of the area were systematically analyzed. The result shows that, (1) a set of deep-water deposits developed in the Gufeng Formation is lithologically composed of siliceous rock, siliceous shale and shale; it is a heteropic product synchronous with the Maokou Formation; the Gufeng Formation deposition is diachronistic, and the deposition time of the north part is earlier than that of the south; because of the poor permeability and solubility, the Gufeng Formation can seal the karsts caused by atmospheric water infiltration; (2) due to the Dongwu Movement, the study area was uplifted and exposed to the surface, reconstructed by the dissolution of atmospheric water, this is the necessary factor forming the karst reservoir of Maokou Formation; (3) the extensional fault system formed during the volcanic activity, which provides channels for atmospheric water infiltrating through the siliceous and argillaceous rocks of Gufeng Formation, is the main controlling factor; (4) the insoluble rocks existing in Gufeng Formation led to the very flat paleogeomorphology of areas covered by the Formation, which has little influence on karst reservoir; and (5) hot and humid paleoclimate provides sufficient external conditions for the development of karst reservoir.

Key words： Northeastern Sichuan Basin; Middle Permian; Maokou Formation; Gufeng Formation; Karst reservoir; Controlling factor

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