河津西磑口奥陶系剖面高精度层序格架的建立  

Establishment of High Resolution Sequence Framework of the Ordovician Section in Xiweikou Area of Hejin City

作　　者：刘阵[1] 何登发[1] 李伯华[2] 冯乔[3] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]山东科技大学地质科学与工程学院,山东青岛266510

出　　处：《石油天然气学报》2013年第5期18-22,6,共5页Journal of Oil and Gas Technology

基　　金：中国石油天然气股份有限公司重大专项(2008E-0702)

摘　　要：运用Exxon层序地层学基本理论,通过对河津西磑口下奥陶统剖面的精细实测和对剖面样品碳、氧同位素数据的分析,结合前人研究成果,将河津西磑口地区下奥陶统划分为6个Ⅲ级层序(Sq1～Sq6)、20个Ⅳ级层序和68个Ⅴ级层序;Sq1～Sq6分别对应下奥陶统冶里组(O1y)、亮甲山组(O1l)和马家沟组(O1m)一段至六段的沉积;碳、氧同位素数据显示研究区早奥陶世经历了6个Ⅲ级的海平面变化旋回,对应于下奥陶统6个Ⅲ级层序。研究认为,Sq1与Sq2整体向上水体环境变浅,与寒武系组成一个Ⅱ级层序,属于该Ⅱ级层序的高位体系域部分;Sq3～Sq6整体经历了一个水体加深、稳定高水位和水体变浅的过程,构成一个独立的Ⅱ级层序。Through the fine measurement of lower Ordovician carbonate strata in Xiweikou Area of Hejin City and the analysis of carbon and oxygen isotopic data of samples,with the basic theory of Exxon sequence stratigraphy,in combination with the predecessors'research results,the Ordovician in Xiweikou Area could be divided into 6 third-order sequences(Sq1～Sq6),20 fourth-order sequences and 68 fifth-order sequences.Sq1～Sq6 corresponded to the sidements of Yeli Formation,Liangjiashan Formation and the 6 th member of Majiagou Formation respectively.According to the carbon and oxygen isotope,there were 6third-order sea-level change cycles in the studied area,corresponding to the 6 third-order sequences.The result indicates that two third-order sequences,corresponding to the Yeli Formation and Liangjiashan Formation,experience a process of the shoaling of the sedimentary water environment.It is the HST of a second-order sequence composed of two third-order sequences with the Cambrian.The four third-order sequences corresponding to the six members of Majiagou Formation,which experiences a deepening,stable and deepening and drawdown of the sedimentary water level,it is composed of a second-order sequence independently.

关 键 词：鄂尔多斯盆地 高精度层序地层 海平面变化 碳酸盐岩 

分 类 号：P618.13[天文地球—矿床学]