Destruction types and temporal—spatial distribution of marine hydrocarbon reservoirs in South China

According to statistics of destroyed hydrocarbon reservoir,natural asphalt,oil and gas seepage and evidence,with studies of basic geological factors which influenced hydrocarbon accumulation and destruction,it was summarized in this paper the destruction types and the distribution of marine hydrocarbon reservoirs in South China.The destruction of hydrocarbon reservoirs was divided into 6 types:fault-rupturing,reservoir-uplifting,cracking for deep subsidence,magmatic process,fold-alternating and fluid-washing,among which the former 4 types were common.The main factors for hydrocarbon reservoir destructions in the study area were erosions or invalidations of cap rocks caused by tectonic activities.At the end of the Caledonian Movement,the lower reservoirs were destroyed in large scale for the first time.Since the Yanshan Movement,fierce tectonic compressions had taken place around the Yangtze block,resulting in destructions for marine hydrocarbon reservoirs in South China except for the Sichuan Basin.Magmatic processes in the middle-lower Yangtze,the Jiangnan-Xuefeng Uplift as well as Yunnan,Guizhou and Guangxi Provinces during the Yanshan Movement caused reservoir destructions in the region.