SOURCE POTENTIAL FOR GENERATING HYDROCARBON AND EXPLORATION PROSPECTS OF MIDDLE-UPPER PROTEROZOIC IN THE NORTHERN CHINA

Middle_Upper Proterozoic marine facies strata is one of the oldest areas sedimentary rock in the northern China.The sedimentary sequence consists of carbonates with intercalations of shales.A great deal of oil seepages and the from comparison of oil with source rocks in outcrop zone or in overlie zone show that the source rock of Middle_Upper Proterozoic may be able to generate hydrocarbon.The five strata of source rocks are distributed in this area.The portion shale strata are evaluated as the best source rock.The average values of organic carbon are 1.84%～ 2.21% in Xiamaling and Hongshuizhuang areas.A lot of carbonate rock strata may be evaluated as the better source rock.The average values of organic carbon are 0.2%～0.29% in Tieling and Gaoyuzhuang areas.The average values of organic carbon is 0.2% in Wumishan formation,and some member of the formation are the better source rock.A majority of organic matter of source rock may be highly evolved to condensate_wet_methane zone.The organic matter of source rock of Jibei depression may be evolved into oil generation_condensate_wet zone,and that of Xiahuayuan region be evolved into oil generative rock.The result of research shows that Jibei depression is the best region for exploring oil reservoirs,and Jizhong depression is the best region for exploring gas reservoirs.