摘要
莺歌海盆地上第三系至更新统可划分出14个层序。不同层序中广泛发育的侵蚀充填代表了两种背景下的低水位沉积。陆坡形成之前，在盆地中央发育浅水背景下大型河流－三角洲沉积体系；陆架陆坡形成演化期，在盆地中央或沿陆坡发育了深水背景下盆底扇和低水位三角洲沉积体系。它们各自具有独特的地震反射特征和沉积体系组合。深水背景低水位沉积体系具有与一般模式相同的生储盖组合特征。浅水背景低水位沉积体系，物源方向与一般模式不同，来自盆地长轴方向，是一种新的低水位沉积模式。莺歌海盆地的低水位沉积具有良好的生储盖组合条件，将是重要的勘探领域。由低水位砂岩与海相泥岩形成的泥底辟相伴生的构造则是最有利的构造。
Fourteen sequences have been divided from Neogene to Pleistocene of Yinggehai basin.Channel pills which widely occur in the sequences represent the lowstand deposits under two different depositional set- tings.In the central area of the basin large fluvial—deltaic depositional systems developed before the slope was formed.The lowstand fans and deltaic depositional systems developed in the stage of shelf and slope forming and developing.The lowstand systems under deep marine setting have the similar play features as conventional play model,but the lowstand systems under shallow marine setting is a new lowstand deposi- tion model,which sedimentary direction was different from the conventional deposition model and parallel to the long axis of the basin.The lowstand deposits of the basin have favorable play conditions and will be the important target for exploration.The structures assosiated with lowstand sandstone and mud diapire formed by marine mud is the most favorable ones.
出处
《中国海上油气（地质）》
1992年第5期1-9,共9页
China Offshore Oil and Gas(Geology)
基金
中国海洋石油总公司及国家自然科学基金资助项目
