天然气勘探与开发2023，Vol.46Issue(4)：47-56,10.DOI:10.12055/gaskk.issn.1673-3177.2023.04.005
川东地区茅口组云化滩相储层特征及分布
Characteristics and distribution of dolomitized beach reservoirs in Maokou Formation,eastern Sichuan Basin
摘要
Abstract
The Middle Permian Maokou Formation has always been a hot spot in Sichuan Basin for oil and gas exploration since natural-gas discovery in the 1950s.With the increasing development,the dolomitized beach reservoirs of this formation in central ba-sin have been undoubtedly the most effective exploration target in recent years.So,large amount of reexamination on old wells and seismic-data interpretation were conducted for eastern basin with a little exploration in order to find out other areas with dolomitized reservoirs of the Maokou Formation.Results show that(i)carbonate rocks in the Maokou Formation,eastern Sichuan Basin,are most-ly transformed into siliceous rocks of the Gufeng Member,while dolomitized beach reservoirs have been newly found in the Maokou Formation beneath the siliceous rocks in Xuanhan-Wanxian area;(ii)microscopic observation displays the dolomitized reservoirs prin-cipally being fine to silty crystal dolomite with strong dolomitization.Vertically,the reservoirs are mainly developed at the bottom of Maokou 2 Member,with the logging porosity of 3.5%-4.3%and the thickness of 3-12 m,indicating better reservoir properties;and(iii)for them,the planar-distribution prediction implies the largest thickness in Wubaiti area to the east Kaijiang,over 15 m in some areas.And favorable exploration areas with the dolomitized beach reservoirs of Maokou Formation thicker than 6 m beneath siliceous rocks in eastern basin are approximately 3,900 km².These areas are expected to become new battlefields for increasing reserves and produc-tion in eastern Sichuan Basin.关键词
四川盆地/二叠系/孤峰段/茅口组/云化滩/储层分布预测Key words
Sichuan Basin/Permian/Gufeng Member/Maokou Formation/Dolomitized beach/Prediction of reservoir distribution引用本文复制引用
郝毅,刘冉,李成海,曹华,胡罗嘉,朱可丹,谷明峰..川东地区茅口组云化滩相储层特征及分布[J].天然气勘探与开发,2023,46(4):47-56,10.基金项目
中国石油天然气集团有限公司上游领域基础性前瞻性项目"残留型海相盆地构造—岩相古地理重建技术研究"(编号:2021DJ0501)、"海相碳酸盐岩有效储层形成与保持机理及分布预测研究"(编号:2021DJ0503). （编号:2021DJ0501）
