Evaluation Marine Carbonate Source Rocks of Middle-Upper Proterozoic in North China

Marine carbonate rocks are widespread and their sedimentary layers are huge and thick.Many oil seepages outcrops are found in the Middle-Upper Proterozoic of North China.Combined with previous data,the paper discusses the evaluation criteria of marine carbonate source rocks.Many factors,such as organic matter types of source rocks,thermal maturity,mineral and chemical composition,paleotemperature and source-reservoir relationship etc.should be considered. Therefore,the abundance cutoff criteria of organic matters in North China especially in the southern area,needs further.In this paper,North China is divided into the north area and the south area,and the organic matter type,organic matter abundance and degree of thermal evolution of organic matter in the two areas in overall,and both of them are high thermal evaluation level. Furthermore,the majority of the organic matters of the source rock have been in highly over matured phase.Source rock mature period of Liulaobei Formation and Xuhuai Group in the southern area is equal to that of the lower Xiamalin Formation in the northern area,the hydrocarbon generation capacity of Chuanlinggou Formation,and different organic matter types obtained with different methods on source rock research in the south area of North China are also put forward.