莺歌海盆地乐东区强制海退体系域及其特征

Forced Regression System Tract and Characteristics of Ledong Area in Yinggehai Basin

莺歌海盆地乐东区中—浅层广泛发育强制海退体系域,通过地震、测井、岩心等资料的综合分析,认为研究区强制海退体系域发育于浅水沉积环境,剖面上表现为沉积楔沿陆坡下倾方向向盆地进积,平面上则表现为滨线近于平行的方式依次向盆地中心迁移。优质储层类型主要包括滨岸砂坝、水道砂和浊积砂。乐东凹陷内强制海退体系域具备形成大型油气藏的良好储层条件,对于该地区的滚动勘探、开发有一定的战略意义。

In the mid-shallow formations of Ledong area of Yinggehai Basin,forced regression system tracts are widely developed.According to the comprehensive analyses of sediments,seismic,logging,core etc.,it is proposed that forced regression system tracts are developed in shallow depositional environment.The depositional wedges prograde toward basin center along downdip direction of the continental slope in section and shorelines migrate toward basin center in turn with method of approximately paralleling in plane. Fine reservoirs include longshore bar,channel sandstone,turbidite sandstone.Forced regression system tracts in Ledong depression area possess the basic condition of forming large-scale oil and gas reservoirs and is strategically important to rolling exploration in the research area.