鄂尔多斯盆地南部延长组层序地层特征及充填演化模式  

Sequence stratigraphy characteristics and filling evolution model of Yanchang Formation in southern Ordos basin

作　　者：陈林[1,2] 陆永潮[1,2] 邢凤存[3] 胡小辉[1,2] 杨帅[1,2] 王超[1,2] 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国地质大学(武汉)资源学院,湖北武汉430074 [3]成都理工大学沉积地质研究院,四川成都610059

出　　处：《中南大学学报（自然科学版）》2015年第6期2196-2206,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41002045)~~

摘　　要：通过对鄂尔多斯盆地南部延长组的地震资料解释、岩石组合类型、测井等资料的综合分析,在延长组内共识别出5个层序界面,将延长组划分为1个一级层序(延长组)、2个二级层序(长10-长7、长6-长1)、4个三级层序(长10-长9、长8-长7、长6-长4+5、长3-长1),建立延长组层序地层格架。在分析延长组各个三级层序构成及充填发育过程中的幕式构造演化、物源供给条件、湖平面相对变化及沉积充填特征的基础上,建立研究区延长组层序充填发育模式,指出每期幕式构造演化下形成的三级层序中的体系域及沉积构成表现出一定的差异性。依据盆地单期及完整多期构造演化下,研究区不同构造部位发育的层序结构及其沉积构成特征,认为多幕式的构造活动分异性以及复杂的构造分布格局是以上多样性和复杂性的主要控制因素。Through comprehensive analysis of seismic data interpretation, rock assemblage styles and logging data of Yanchang Formation in southern Ordos basin, five sequence boundaries were recognized in Yanchang Formation which were further divided into 1 first-order sequence（Yanchang Formation）, 2 second-order sequences（Chang10-Chang7, Chang6-Chang 1）, 4 third-order sequences（Chang 10-Chang9, Chang8-Chang7, Chang6-Chang4＋ 5, Chang3 -Chang 1 ）, and the sequence stratigraphic framework was also established. Based on the analysis of the episodic tectonic evolution, sediments supply for the basin, relative change of lake level and sedimentary filling characteristics, the development model of sequence sedimentary filling of Yanchang Formation in the study area was established, indicating that there are some differences in depositional system tracts and depositional compositions in the third-order sequence which was formed in each episodic tectonic evolution. According to the characteristics of sequence structure and sedimentary composition in different tectonic positions of the study area, it is considered that the main controlling factors of the above diversities and complexities are the differentiations of episodic tectonic activities and the complicated tectonic distribution patterns.

关 键 词：鄂尔多斯盆地 延长组 层序地层 沉积充填 幕式构造演化 

分 类 号：TE121[石油与天然气工程—油气勘探]