辽河盆地欧利坨子地区层序地层研究

SEQUENCE SRATIGRAPHY RESEARCH ON THE OULITUOZI AREA OF LIAOHE BASIN

将层序的概念应用于陆相湖盆 ,通过地震、测井相识别及岩心观察 ,在辽河盆地欧利坨子地区识别出一个区域性的角度不整合 ,一个盆内角度不整合和四个局部不整合。据此划分出该区的巨层序、超层序以及目的层的层序界面以及其所包括的体系域 ;阐述了该区层序地层格架包括一个巨层序 ,二个超层序 ,主要目的层古近系 (下第三系 )的东营组及沙河街组包括四个层序。对认识该区的油气分布及生、储、盖组合关系有重要指导意义。

Sequence is a set of contributing connection stratigraphic units that boundaries of tops and bottoms are unconformity or corresponding conformity. The concept is used in the continental basin in the context. Through seismic, logging facies identification and core observation, a regional unconformity, a unconformity of the basin and four partial unconformities of the aim beds are recognized. Based on this, the boundaries of huge, super sequences, sequences and system tracts are divided. This paper describes that the sequence stratigraphic framework concludes a huge sequence and two super sequences in the area and four sequences in the Paleocene Dongying Formation and Shahejie Formation. This is of great importance to the recognition of oil and gas distribution and the association of source rock, reservoir rock and cap rock.