天然气勘探与开发2023，Vol.46Issue(4)：35-46,12.DOI:10.12055/gaskk.issn.1673-3177.2023.04.004
川中高石梯—磨溪地区中二叠统茅口组岩溶发育特征与岩溶古地貌恢复
Development characteristics and paleogeomorphology restoration of karsts in Middle Permian Maokou Formation,Gaoshiti-Moxi area,central Sichuan Basin
徐平生 1唐松 2孙超国 1梁家驹 1李天军 3师晴1
作者信息
- 1. 油气藏地质及开发工程国家重点实验室·成都理工大学
- 2. 中国石油西南油气田公司川中油气矿||中国石油大学(北京)地球科学学院
- 3. 中国石油西南油气田分公司勘探开发研究院
- 折叠
摘要
Abstract
The Middle Permian Maokou Formation is one of the important gas production layers in the Sichuan Basin.Its weathered crust karst reservoirs are crucial to the production.Based on the analysis of core,logging,drilling and seismic data,the development of weathered crust karsts was characterized.Then,with the bottom surface of the second member of the Maokou Formation as the da-tum,the karst paleogeomorphology of the Formation was restored by using the residual thickness method.The karst paleogeomorpho-logical units were classified according to the modern karst theory,and the microgeomorphology and its associations in the study area.Finally,the relationships between various karst paleogeomorphical features and karst reservoirs were analyzed.The research results are as follows:(i)The top of the Maokou Formation is absent universally,and in unconformable contact with overlying strata.Various dissolution phenomena are observed,reflecting remarkable response characteristics from drilling,logging and seismic data.(ii)The karst paleogeomorphology can be divided into two second-order units:karst gentle slope and karst depression,and nine third-order units such as peak cluster depression,peak mound depression,and mound-cluster ridge ravine,etc.(iii)The karst units are very differ-ent in reservoir development conditions.Typically,the karst gentle slope has the conditions for developing large-scale karst reservoirs,especially around the negative karst topography,the dissolution and preservation conditions are excellent and high-quality karst reser-voirs are more developed.Thus,it will be the key area for subsequent exploration.关键词
高石梯—磨溪地区/中二叠世/茅口组/古地貌恢复/残余厚度法/岩溶储层Key words
Gaoshiti-Moxi area/Middle Permian/Maokou Formation/Paleomorphology restoration/Residual thickness method/Karst reservoir引用本文复制引用
徐平生,唐松,孙超国,梁家驹,李天军,师晴..川中高石梯—磨溪地区中二叠统茅口组岩溶发育特征与岩溶古地貌恢复[J].天然气勘探与开发,2023,46(4):35-46,12.
