摘要
通过对大量单井及野外地面露头地层资料的分析研究,在总结对比不同构造、不同时期蜀南地区及邻区奥陶系地层划分方案的基础上,以岩石地层特征为主要依据,综合分析古生物特征及电性特征,将奥陶系地层自下而上分为下奥陶统桐梓组、红花园组,下中奥陶统湄潭组,中上奥陶统十字铺组,上奥陶统宝塔组、五峰组。并对其地层特征及展布进行了详细研究,下奥陶统为陆源碎屑岩夹海相碳酸盐岩为主,中奥陶统为海相碳酸盐岩沉积,上奥陶统下部为海相碳酸盐岩,上部为海相碎屑岩。奥陶系各组地层西薄东厚、北薄南厚,整体呈西北薄、东南厚的趋势。
By analysis and study of bulk of wells and outcropping,on the base of generalized various structures and stratigraphic classifications of Ordovician of different periods in Shunan and adjacent areas of Sichuan Basin,in terms of lithostratigraphy characteristics and comprehensive analysis of its Paleontologic characteristics and rock resistivity,the Ordovician in south Sichuan basin could be divided into six formations:Tongzi,Honghuayuan and Meitan Formation of Lower Ordovician,Shizipu and Baota Formation of Middle Ordovician and Wufeng Formation of Upper Ordovician.Study on the stratigraphic characteristics and distribution indicates that Lower Ordovician mainly develops clastic rock and clip carbonate rock.Middle Ordovician develops marine carbonate.Lower part of Upper Ordovician develops marine carbonate and it's upper part develops clastic.The thickness of each Formation of Ordovician in the studied area gradually reduces from southeast to northwest.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2008年第05X期192-196,203,共6页
Journal of Oil and Gas Technology
基金
中国石油天然气股份公司重点基础研发项目(070104-2)
关键词
四川盆地
蜀南地区
奥陶系
地层划分
地层对比
Sichuan Basin
Shunan Area
Ordovician
stratigraphic classification and correlation
