对南海北部陆坡至东海南部“残留特提斯”的几点认识

NEW OPINIONS ABOUT"RESIDUAL TETHYS"IN NORTHERN SOUTHCHINA SEA SLOPE AND SOUTHERN EAST CHINA SEA

特提斯构造域是指发育于欧亚大陆南缘的一条全球性纬向展布的构造域,在该构造域内发育有许多蕴含丰富油气资源的沉积盆地,是世界上最主要的含油气区。通过对比分析世界上典型的"特提斯域"所拥有的特有沉积及构造环境及其对油气生成、聚集成藏与保存带来的深刻影响,如赤道封闭型浅海碳酸岩盐礁为主夹页岩的沉积主体及有机质类型为Ⅰ、Ⅱ型及蒸发岩盖层等特征,并通过对实际勘探资料的对比分析,认为南海北部、东海南部中生代缺乏典型"特提斯域"沉积及典型特提斯型大型油气藏成藏条件。

Tethys is a latitudinal global tectonic-areas located in the southern edge of Europe-Asia continent. It is one of the most important hydrocarbon region in the world, and there are many petroleum rich sedimentary basins. This paper compares and analyzes the conditions in which specially sedimentary and structural environments of the typical 'Tethys' region in the world influence the generation, accumulation and preservation of oil and gas , e.g.the main body of the sedimentary rocks consisting of carbonate-reefs and shale-mudstones was formed in the equatorial closed shallow marine. The type of organic matters in the source rocks, which are contained in those rocks, are typeⅠand typeⅡ, The evaporite rocks and gypsums are the typical regional caps in those sedimentary rocks. Some new ideas are obtained through the correlation and analysis of actual exploratory data. The main idea is that the Mesozoic in northern South China Sea and southern East China Sea lack of typical 'Tethys' sediment remains and reservoirs forming conditions.