岩性油气藏 ›› 2020, Vol. 32 ›› Issue (3): 44–55.doi: 10.12108/yxyqc.20200305

• 油气地质 • 上一篇    下一篇

四川盆地茅口组岩溶古地貌刻画及油气勘探意义

张亚, 陈双玲, 张晓丽, 张玺华, 谢忱, 陈聪, 杨雨然, 高兆龙   

  1. 中国石油西南油气田分公司 勘探开发研究院, 成都 610041
  • 收稿日期:2019-08-25 修回日期:2019-12-18 出版日期:2020-05-21 发布日期:2020-04-30
  • 通讯作者: 陈双玲(1989-),女,硕士,工程师,主要从事石油与天然气地质方面的研究工作。Email:chenshuangling@petrochina.com.cn。 E-mail:chenshuangling@petrochina.com.cn
  • 作者简介:张亚(1987-),男,硕士,工程师,主要从事石油与天然气地质方面的研究工作。地址:(610041)四川省成都市高新区天府大道北段12号石油科技大厦。Email:zhangya08@petrochina.com.cn
  • 基金资助:
    国家科技重大专项“四川盆地二叠系—中三叠统大型气田富集规律及目标评价”（编号：2016ZX05007004）和中国石油重大专项“西南油气田天然气上产300亿立方米关键技术与应用”（编号：2016E-06）联合资助

Restoration of paleokarst geomorphology of Lower Permian Maokou Formation and its petroleum exploration implication in Sichuan Basin

ZHANG Ya, CHEN Shuangling, ZHANG Xiaoli, ZHANG Xihua, XIE Chen, CHEN Cong, YANG Yuran, GAO Zhaolong   

  1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
  • Received:2019-08-25 Revised:2019-12-18 Online:2020-05-21 Published:2020-04-30

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摘要： 四川盆地广泛发育岩溶缝洞型储层。为恢复茅口组岩溶古地貌，开展了钻井岩心分析、测井分析和地震资料解释等研究，并对全盆地茅口组地层进行精细划分和对比，通过井震结合、残厚法和印模法精细刻画了茅口组岩溶古地貌特征。结果表明：①茅口组整体具有“西高东低”的岩溶古地貌形态，由西向东可划分出岩溶高地、岩溶斜坡、岩溶洼地等3个一级地貌单元，细分为残丘、坡地、洼地和沟谷等二级地貌单元；②广元—元坝—达州—奉节一线为岩溶盆地，茅口组残余厚度小于180 m，是在茅口期裂陷槽基础上继承性演变的地貌形态，裂陷槽内发育深水相孤峰段沉积；③蜀南—川中—川北一带为岩溶斜坡，茅口组岩溶作用较为发育，有效岩溶储层保存好，主要分布于岩溶残丘和坡地，而岩溶沟谷内的溶蚀孔洞大多被龙潭组泥质充填；④茅口期的川北剑阁—元坝—龙岗地区处于裂陷槽边缘，为浅水高能台缘滩沉积，为岩溶储层的重要勘探领域。该研究成果为优质岩溶储层勘探指明了方向，具有重要的理论意义和勘探价值。

关键词: 岩溶古地貌, 岩溶储层, 峨眉地裂运动, 茅口组, 四川盆地

Abstract: Karst reservoirs are widely developed in Sichuan Basin. In order to restore the karst paleogeomorphology of Maokou Formation,the studies on drilling core analysis,logging analysis and seismic data interpretation were carried out. The karst paleo-geomorphological features of the Maokou Formation were characterized by well seismic combination,residual thickness method and impression method. The results show that:(1) The Maokou Formation has the paleo-karstic morphology of "high in the west and low in the east". From the west to the east, the paleo-karst geomorphology could be classified into three geomorphic units such as karst highland,karst slope and karst depression,as well as second-level geomorphologic units,such as residual mound,slope,depression and gully.(2) Karst basin are distributed in Guanyuan-Yuanba-Dazhou-Fengjie area,with residual thickness of Maokou Formation of less than 180 m,which is inherited and evolved landform on the basis of Mao-kou rifting trough. There are deep water facies deposits in the rift trough.(3) The area from south of Sichuan to middlenorth is a karst slope. Karsti-fication is well developed,and effective karst reservoirs are well preserved,mainly distributed in karst residual hills and slopes,while most of the dissolved holes in karst gully are filled with mud of Longtan formation.(4) Jiange-Yuanba-Longgang area in northern Sichuan is located at the edge of rift trough, which is shallow high energy platform edge beach facies and an important new exploration field of karst reservoir. The research results are of great theoretical significance and exploration value for the direction of high-quality karst reservoir exploration.

Key words: karst geomorphology, karst reservoirs, Emei Taphrogenesis, Maokou Formation, Sichuan Basin

中图分类号: 

  • TE122.1
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