【摘要】 南黄海南部盆地南二凹陷是一个中—新生代陆相凹陷。以往的研究认为该凹陷面积为1 053 km2,中—新生界陆相地层最厚5 500 m,生烃量仅0.91亿t,勘探潜力十分有限。为了弄清南二凹陷的规模、与相邻构造单元的接触关系、内部结构、充填序列等基本地质问题,以2012年该区域新实施的630 km二维地震资料为基础,进行了地震解释及综合石油地质条件评价。结果表明:南二凹陷是一个典型的中—新生代"南断北超"断陷湖盆;凹陷面积大于1 700 km2,是南黄海南部盆地最大的凹陷;南二凹陷中—新生界陆相地层最厚7 500 m,古近系最大厚度5 000 m,初步估算古新统阜宁组资源量为2.9亿~3.6亿t,显示了良好的含油气前景;南二凹陷北部斜坡带发育鼻状构造带,其紧邻生烃洼陷,是海、陆相油气汇聚的主要指向区,为最有利的勘探区带。更多还原

【Abstract】 Nan-2 sag of South basin in the southern Yellow Sea is a Meso-Cenozoic continental sag.Previous studies hold that this sag is limited in exploration potential,with its area 1 053 km2,the greatest thickness of Meso-Cenozoic continental strata 5 500 m and the hydrocarbon generation only 91 million tons.In order to solve basic geological problems of Nan-2 sag,such as the size,its contacts with the adjacent structural units,its internal structure and its filling sequence,seismic interpretation and integrated geological evaluation were conducted based on630 km2 D seismic data acquired in2012.The results showed that:(1)Nan-2 sag is a typical Meso-Cenozoic rifted lake with"south faulting and north onlapping",and as the largest sag in South basin,its area is more than 1 700 km2;(2)The greatest thicknesses of Meso-Cenozoic and Paleogene are about 7 500 m and 5 000 m respectively,and the preliminarily estimated resource in Paleocene Funing Formation is 290~360 million tons,indicating great hydrocarbon potential;(3)A nose zone in the north slope of Nan-2 sag may be one of the most favorable plays,because it is adjacent to a major hydrocarbon-generation sag and has become an important area of hydrocarbon accumulation.更多还原