南黄海南部盆地南二凹陷构造格局及含油气前景新认识  

New knowledge of tectonic framework and hydrocarbon potential in Nan-2 sag,South basin,the southern Yellow Sea

作　　者：吴炳伟[1] 江建虹[1] 王先勇[1] 张亚丽[1] 刘东奇[1] 王新[1] 徐浩伦[1] 翁文胜[1] 黄淑芳[1] 

机构地区：[1]中国石油辽河油田分公司,辽宁盘锦124010

出　　处：《中国海上油气》2015年第1期27-32,共6页China Offshore Oil and Gas

基　　金：中国地质调查局"海洋油气资源调查战略选区研究(编号:1211302108024-1)"部分研究成果

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1053km^2,中—新生界陆相地层最厚5500m,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630km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1700km^2,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7500m,古近系最大厚度5000m,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。Nan-2 sag of South basin in the southern Yellow Sea is a Meso-Cenozoic continental sag. Previ- ous studies hold that this sag is limited in exploration potential, with its area 1 053 km^2 ,the greatest thick- ness of Meso-Cenozoic continental strata 5500m 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 struc- tural units, its internal structure and its filling sequence, seismic interpretation and integrated geological e- valuation were conducted based on 630 km 2D seismic data acquired in 2012. The results showed that. （1） Nan-2 sag is a typical Meso-Cenozoic rifted lake with “south faulting and north onlapping”, and as the lar- gest sag in South basin, its area is more than 1700km^2; （2） The greatest thicknesses of Meso-Cenozoic and Paleogene are about 7 500 m and 5000m respectively,and the preliminarily estimated resource in Pa- leocene 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 ma- jor hydrocarbon-generation sag and has become an important area of hydrocarbon accumulation.

关 键 词：南黄海南部盆地 南二凹陷 中 新生代 构造格局 资源潜力 油气勘探前景 古近系 阜宁组 

分 类 号：TE122.3[石油与天然气工程—油气勘探]