RECONSIDERATION ON MARINE PETROLEUM EXPLORATION PROSPECTS IN THE MIDDLE HUNAN DEPRESSION

Compared with other exploration areas in south China,the Middle Hunan depression has fairly superior conditions for petroleum accumulation.1)Evolution degree of hydrocarbon source rocks is relatively lower and the Longtan coal series are still dominated by soft coal.2)Regionally,two sets of coal series,the Ceshui and the Longtan,are distributed continuously with fairly good covering ability.Drilling data has proved that oil and gas shows are very active.3)The Middle Hunan depression was located near(equator) in(Paleozoic) and the storm rocks developed widely is favorable for oil and gas migration and accumulation.4)The Jiangnan Xuefeng Palaeo-lifts formed early support condition for preservation and rebuilding of oil and gas accumulation.Therefore,the Middle Hunan depression has fairly good(exploration) prospects.(According) to present exploration status,exploration targets should be the lower combinations in the(Lianyuan) depression,advancing toward the Jiangnan Xuefeng Palaeo-continent gradually.