EVALUATION OF THE HYDROCARBON——GENERATING POTENTIAL FOR THE POSSIBLE HYDROCARBON SOURCE ROCKS OF THE MIDDLE——UPPER PROTEROZOIC IN NORTH HUABEI AREA
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摘要: 华北中、上元古界海相碳酸盐岩分布广泛,且沉积岩层巨厚.同时,在华北中、上元古界发现了多处油苗、沥青显示,可能为一套生油层系.通过对华北北部中、上元古界有机质热解数据的分析测定,得出了干酪根类型主要为Ⅱ型和Ⅲ型、Ⅰ型干酪根较少,这与根据当时地球上生物发育尚处于初级阶段、有机质类型主要以腐泥型为主的认识有较大差异.另外,就生油潜力而言,下马岭组的干酪根类型优于其它层位的干酪根类型.文中,还通过系统研究有机质丰度、生烃潜量及其干酪根类型来对各个层系源岩的生烃潜力进行评价,发现下马岭组、铁岭组和洪水庄组生烃潜力较好,为3个有利的生烃层位.Abstract: 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.
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