辽河坳陷西部凹陷北区湖盆深陷期层序地层响应  

Sequence stratigraphic responses to the lacustrine basin deep-faulted period in the north area of the western sag,Liaohe Depression

作　　者：王青春[1] 鲍志东[2] 贺萍[1] 

机构地区：[1]石家庄经济学院 [2]中国石油大学(北京)

出　　处：《石油勘探与开发》2010年第1期11-20,共10页Petroleum Exploration and Development

基　　金：国家自然科学基金项目(40672071);河北省自然科学基金项目(D2008000534)

摘　　要：断陷湖盆是在张裂背景下形成的陆相湖盆,湖盆发育的不同阶段,层序地层特征各异。辽河坳陷西部凹陷北区湖盆深陷期经历了初始断陷阶段→快速沉降阶段→稳定沉降阶段→剧烈沉降阶段→短暂回返阶段共5个阶段,发育沙四段和沙三段。研究认为,湖盆深陷期研究区共发育2套三级层序,湖盆发育的不同阶段,分别形成了层序Ⅰ低位体系域、湖侵体系域和高位体系域,以及层序Ⅱ湖侵体系域和高位体系域。湖盆发育过程控制着地层充填样式,受构造坡度、水体深浅、物源供给及断裂活动强度等影响,不同区域形成了不同的地层叠加样式,导致了层序地层充填模式的差异,并最终影响着储集层的储集物性。Faulted lacustrine basins are continental lacustrine basins formed under tensional and rifting environments.They have different sequence stratigraphy characteristics in different developing stages.The lacustrine basin deep-faulted period in the north area of the western sag of the Liaohe Depression can be divided into five stages： initial faulted stage,fast subsided stage,stable subsided stage,intense subsided stage and short inversion stage.As a result,Sha-4 and Sha-3 Members were formed in this period.Two sets of third-order sequence have been developed in the deep-faulted period.In different development stages of the lacustrine basin,Lowstand Systems Tract（LST）,Transgressive Systems Tract（TST） and Highstand Systems Tract（HST） of Sequence I as well as TST and HST of Sequence II were shaped.The formation filling styles were controlled by the developing process of the lacustrine basin.In addition,the different superimposition styles of formation were formed in different areas under impact of the structural slope,the water depth,the sediment supply,the tectonic activity,and so on,which lead to difference in sequence stratigraphy filling mode,affecting the physical property of the reservoir.

关 键 词：断陷湖盆 地层 层序 界面 储集层 

分 类 号：TE121.3[石油与天然气工程—油气勘探]