贵州习水地区奥陶系露头层序地层研究  

Outcrop Sequence Stratigraphy of the Ordovician in Xishui,Guizhou

作　　者：刘治成[1] 张廷山[1] 完颜祺琪[1,2] 杨扬[3] 杨巍[1] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [3]中国石油西南油气田分公司蜀南气矿,四川泸州646000

出　　处：《西南石油大学学报（自然科学版）》2012年第4期1-12,共12页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：四川省重点学科建设项目(SZD0414)

摘　　要：根据野外露头剖面资料,结合碳氧同位素分析,探讨了贵州习水地区奥陶系层序地层界面识别、层序划分及其碳氧同位素响应。研究区奥陶系可划分出6个三级层序,包括两个I型层序界面,两个II型层序界面及两个III型层序界面。三级层序内海侵体系域和高水位体系域内δ13C分别呈增加和减小的趋势。碳氧同位素响应能有效反映准层序叠置形成四级层序。米级旋回发育两种模式:L–M型米级旋回、潮下型米级旋回。： According to the outcrop and the analyses of the carbon and oxygen isotopes, this paper discusses the identified stratigraphic sequence surfaces and the response of carbon and oxygen isotopes for the Ordovician formation of Xishui Region in Guizhou Prvince, and carbon and oxygen isotopes. The result shows the Ordovician system can be divided six three-order sequences, which include two I-type and two II-type and two III-type sequence surfaces. In the third-order stratigraphic sequence, 613C in system of the advance of sea and the high water level displays trends of increase and decrease respectively. The responses of carbon and oxygen isotope can effectively reflect the stacking patterns ofparasequences form forth order sequence. Meter-scale cycle has developed two modes in this area during Ordovician period： one is L-M meter-scale cycle type, and the other is Subtidal meter-scale cycle type.

关 键 词：层序地层 体系域 碳氧同位素 奥陶系 习水地区 

分 类 号：TE121[石油与天然气工程—油气勘探]