南海潮汕坳陷前第三纪盆地结构地球物理研究

Geophysical Study of Pre-Tertiary Basin Style of Chaoshan Sag in South China Sea

通过对珠江口盆地潮汕坳陷地质、地球物理条件的分析,采取针对性的综合地球物理研究方法,对地震资料难以解决的前第三系盆地结构及中生界的分布进行了综合物探研究,确定了盆地的重力和磁性基底深度,首次获得了全区中生界的分布,并对盆地内的断裂、火成岩分布及构造区划作了推断,提出了该坳陷为弧前盆地的认识,为该区勘探部署和进一步研究提供了依据.

On the basis of analyses of geological and geophysical materials of Chaoshan Sag in the Pearl River Mouth Basin, the Pre-Tertiary basin style and Mesozoic distribution which could not be distinguished by seismic surveying are studied in this paper using integrated geophysical research method. The buried-depths of gravitational and magnetic basement are then determined. The Mesozoic distribution in the whole surveyed area is obtained for the first time, Furthermore, the faults, igneous distribution and tectonic zoning within the basin are deduced and a new cognition that the sag is a forearc basin has been put forward, which provided the basis for the exploration arrangement and further studies of this area.