古地貌恢复在风化壳岩溶型储层研究中的应用——以川中—川南过渡带奥陶系为例  

The application of ancient geomorphy recovery to the study on the palaeoweathering crust-type karst reservoir

作　　者：洪余刚[1] 陈景山[2] 代宗仰[2] 钱津[1] 

机构地区：[1]四川石油管理局地球物理勘探公司,四川成都610213 [2]西南石油大学资源与环境学院,四川成都610500

出　　处：《大庆石油地质与开发》2007年第1期1-5,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：四川省重点学科建设项目(编号SZD0414)资助

摘　　要：川中—川南过渡带奥陶系顶面曾经遭受超过100 Ma的风化剥蚀,形成古风化壳储层的可能性很大。由于它埋藏深、探井少,且缺乏三维地震资料,给储层预测工作带来很大难度。通过地震构造解释,区域构造背景分析,研究了奥陶系可溶蚀地层及可溶蚀区域分布范围,以上奥陶统底面和下二叠统底面沿奥陶系剥蚀尖灭线拼合的等时面及下二叠统顶面为基准,采用印模法恢复出古地貌形态,划分了岩溶高地、岩溶斜坡和岩溶谷地,为下一步的储层预测工作提供出有利目标区域。After more than 100 million years＇ weathering and denudation, it is greatly possible to form into palaeoweathering crust-type karst reservoir in Ordovician strata of the Middle to South Sichuan transition zone. Because it is buried deeply with few exploration wells and lacking of 3-D seismic data, it is very hard to predict the reservoir. Seismic struction interpretation, area structure setting analysis and soluble formation distribution studies are finished firstly, and then the isochron surface of the upper OMovician subface spliced with the Lower Permian basal pinacoid along the Ordovician wedge out and the apex face of Lower Permian are selected to resume the ancient geomorphy with Moulage method. And then the karst highland, dip and uvala ale set out to provide the favorable area for further reservoir prediction study.

关 键 词：古岩溶 碳酸盐岩 古地貌恢复 奥陶系 

分 类 号：TE122.2[石油与天然气工程—油气勘探]