北部湾盆地涠西南凹陷涠洲12-D油田流一段滑塌型重力流沉积模式新认识OA

Through the analysis of tectonic setting and depositional setting,the depositional system of the first member of the Liuhe Formation in Weizhou 12-D Oilfield in the Southwest Depression is redefined,which is the slumping gravity flow deposit.Referring to the classification schemes of deep-water gravity flow sedimentary units at home and abroad,and making full use of the comprehensive interpretation and application of core,logging and seismic data,three systems and four sedimentary units are divided and identified in the study area,which are clastic tongue,lobe,clastic flow block and turbidite thin sand developed under the system of block transportation,clastic flow and turbidity current.A gravity flow deposition model of slumping type controlled by both debris flow and turbidity current is established.It provides a reliable geological basis for the subsequent exploration and development of the oilfield and the adjustment of the oilfield potential tapping.