贝南凹陷古地形对层序结构及沉积充填的控制

Control of Paleomorphology to Sequence and Sedimentary System in South Beir Depression

摘要:

根据对贝南凹陷的盆地边缘的古地形、古地貌的结构特征的分析，将贝南凹陷白垩纪发育的古构造坡折带划分为5种类型，分别控制 5种类型沉积体系的形成和分布.断崖型坡折带控制着近岸水下扇沉积体系的形成和分布；陡坡型坡折带控制着扇三角洲及前方的远岸湖底扇体系的形成和分布；断阶型坡折带控制着斜坡扇沉积体系的形成和分布；缓坡型坡折带控制着扇三角洲沉积体系的形成和分布；在基准面下降阶段，盆内坡折控制着远岸湖底扇的形成和分布.

Abstract:

According to the analysis of the configuration of paleogeomorphology and paleotopography of the margine of South Beir Depression,the paleo slope break belt of South Beir Depression during the development of cretaceous is divided into 5 types which control the formation and distribution of 5 types of sedimentary system.The faulted scarp type controls the development of near shore subaqueous fan system.The steep slope type controls the development of fandeltas and near sublake fan system.The faulted terrace type controls the development of slop fan system.The gentle slope type controls the development of fan delta system.In basinlevel falling stage,the shore sublacustrine fan system is developed on inner basin types of break inslop.