北黄海盆地西部坳陷地层与沉积特征

STRATIGRAPHY AND SEDIMENTARY CHARACTERS OF THE WESTERN DEPRESSION,NORTH YELLOW SEA BASIN

摘要: 西部坳陷位于北黄海盆地西部,是盆地6个彼此分割的二级构造单元之一。从实际地震资料出发,结合区域地质及盆地东部钻井资料,运用地震地层学、层序地层学等方法,对西部坳陷的地层发育及分布特征、沉积环境及沉积相等进行了初步分析,认为本坳陷具东西双断的三层结构特征,发育上侏罗统、下白垩统、始新统、渐新统、新近系等地层,中新生代沉积巨厚,最厚达10 200 m,以河-湖-三角洲等陆相沉积为主,具有较好的油气条件及资源前景。

Abstract: There are four depressions and two bulges in the North Yellow Sea Basin.The Western Depression is studied in this paper. Stratigraphy,sedimentary environments and sedimentary facies were studied based on regional geology, wells in Eastern Depression and more than 4 500 km seismic data.There occur three super sequences in the Western Depression,including the upper-Jurassic, lower-Cretaceous, Eocene, Oligocene, Neogene and Quaternary. They are all terrestrial deposits including fluvial, lacustrine and deltaic facies mainly. The total thickness is up to 10 200 metres. There is great petroleum resource potential.