古地形对陆相断陷盆地层序结构模式和沉积充填特征的控制

CONTROL OF PALEO-MORPHOLOGY TO STRATIGRAPHIC

摘要:

摘要：盆地的古地形和构造坡折带的形态和类型决定着沉积充填的特征和砂体储层的分布{1}。本文根据对南贝尔凹陷的盆地边缘的古地形、古地貌的结构特征的分析，将南贝尔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:

Abstract: The paleogeomorphology, the shape and type of slope break belt of basin controlled the infilling characteristics of sediments and the distribution of sandbody reservoir. In this article, 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 are divided into 5 types which controlled the formation and distribution of 5 types of sedimentary system. Faulted scarp type slope break belt controlled the development of near shore sub-aqueous fan system; Steep slope type slope break belt controlled the development of fan-deltas and near sub-lake fan system; Faulted terrace types of slope break belt controlled the development of slop fan system;. Gentle slope types slope break belt controlled the development of fan delta system; In basin-level falling stage, far from shore sub-lacustrine fan system developed on inner basin types of break in slop.