THE STUDY OF EXPLORATION PROSPECT OF MARINE NATURAL GAS IN THE NEOPROTEROZOIC-LOWER PALEOZOIC ON THE SOUTH MARGIN OF THE NORTH CHINA PLATFORM

According to the field investigation results on the northern edge of the Qingling-Dabie Orogenic Belt,it was showed that the black mudstone and shale containing phosphor in the Lower Cambrian Yutaishan/Dongpo formation on the south margin of the North China Platform was the high quality source rocks,and the dark grey shale in Cuizhuang/Liulaobei formation of the Qingbaikou System was the potential source rocks.The Neoproterozoic-Lower Paleozoic sandstones and dolomites were the main reservoirs,with favorable pore space developed on several karst erosional surfaces internal the Neoproterozoic-Lower Paleozoic sequences.And the shale and the carbonate rocks with gypsum in the Neoproterozoic-Lower Paleozoic were the cap rocks.There were basic conditions for hydrocarbon ge-neration and accumulation although the thermal maturity was higher in the area.Therefore,it is probably the new formation and new domain for exploration of the marine natural gas in the Neoproterozoic-Lower Paleozoic on the south margin of the North China Platform.