EVALUATION OF THE HYDROCARBON——GENERATING POTENTIAL FOR THE POSSIBLE HYDROCARBON SOURCE ROCKS OF THE MIDDLE——UPPER PROTEROZOIC IN NORTH HUABEI AREA

Marine carbonate rocks are widespread and their deposit layers are huge thick in the Middle-Upper Proterozoic of North China.At the same time,many outcrops of asphalt and oil seepages in the Middle-Upper Proterozoic strata indicate that their hydrocarbon-generating potential appraising is an important subject to further study.In this article,by managing the pyrolysis data of organic matter,we concluded that kerogen was mainly humic (Ⅱ) type and humic-sapropelic (Ⅲ) type with few Ⅰ type.This is of great differences with the fact that the evolution of living beings standed on initial stages and organic matter held sapropelic type at that time.Moreover,as for the oil-generating potential,the kerogen type of the Xiamaling Group is better than that of other groups.By systematical studying of the organic matter abundance,the hydrocarbon-generating potential and the kerogen types of samples,the authors synthetically determined the hydrocarbon-generating potential of samples in the Middle-Upper Proterozoic of North Huabei area and found three positions of better hydrocarbon-generating potential,namely,the Xiamaling Group,the Tieling Group and the Hongshuizhuang Group.