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1993年3月23日,广州海洋地质调查局第二海洋地质调查大队《奋斗四号》物探船从广州启航,开赴南沙群岛曾母盆地、万安盆地进行油气普查。 本航次将在南沙曾母盆地完成6500km~2综合地球物理区域普查的任务后,再赴万安盆地开展1500km~2局部构造带普查,以查明曾母盆地次级构造单元的分布和构造特征,初步评价其含油气远景。对万安盆地除对其局部构造带和主要圈闭进行含油气远景评价外,还要求提供普查井位。 南沙海域面积达80万km~2,其中有万安北盆地、万安盆地、曾母盆地、文莱—沙巴盆地和礼乐盆地等13个新生代盆地,盆地面积达37万km~2,沉积厚度逾万米。据地质资料计算,这些盆地的油气资源达294亿吨,占我国油气资源总储量的1/3,其中曾母盆地面积最大,为18万km~2,油气资源达107亿吨,在我国传统海疆域内达80亿吨。
March 23, 1993, Guangzhou Marine Geological Survey Second Marine Geological Survey Brigade “Struggle IV” set sail from Guangzhou, went to the Nansha Islands Zengmu Basin, Wan An basin for oil and gas census. This voyage will be completed in the Nansha Zengmu Basin 6500km ~ 2 integrated geophysical regional census task, and then go to Wanan Basin 1500km ~ 2 local tectonic belt survey to identify the Zengmu basin secondary tectonic units distribution and tectonic characteristics , Preliminary assessment of its oil and gas prospects. In addition to the long-term hydrocarbon-bearing assessment of its local tectonic belts and major traps, the Wan’an Basin also requires the provision of census wells. There are 13 Cenozoic basins such as Wan’anbei Basin, Wan’an Basin, Zengmu Basin, Brunei-Sabah Basin and Li Le Basin. The basin covers an area of 370,000 km 2, Deposition thickness of more than ten thousand meters. According to the geological data, the oil and gas resources in these basins reached 29.4 billion tons, accounting for one third of the total reserves of oil and gas in China. Among them, Zengmu Basin has the largest area of 180,000 km 2 and the oil and gas resources reach 10.7 billion tons. In our country, Sea territory up to 80 million tons.