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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。
The South Second Depression in southern South Yellow Sea Basin is a Meso-Cenozoic continental depression. According to previous studies, the area of the depression is 1 053 km 2. The thickness of the Meso-Cenozoic continental facies is 5 500 m at the thickest and the hydrocarbon generation is only 91 million t. The exploration potential is very limited. In order to understand the basic geological problems such as the size of Nan2 Sag, its contact relationship with the adjacent tectonic units, the internal structure and the filling sequence, based on the newly implemented 630 km 2-D seismic data in this area in 2012, the seismic interpretation and Comprehensive evaluation of geological conditions. The results show that Nan2 sag is a typical middle-Cenozoic and “South-North” fault basin. The sag area is more than 1 700 km2 and is the largest sag in the southern South Yellow Sea Basin. The Mesozoic-Cenozoic The maximum thickness of continental facies is 7 500 m and the maximum thickness of Paleogene is 5 000 m. Preliminary estimates of the Funing Formation in the Paleocene from 290 million to 360 million t show good prospects for oil and gas. The north slope of the southern Nan 2 depression Developed nose structure zone, which is close to the hydrocarbon-generating depression, is the main point for the convergence of oil and gas in the sea and continental facies, and is the most favorable exploration zone.