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中—上元古界具有最古老而又未变质的沉积层系,其原生油气是一个值得关注的能源资源领域。华北地区中—晚元古代地层分布广,厚度大,地层时代老,张家口下花园青白口系下马岭组是我国华北地区从元古界到下古生界海相沉积有机质相对富集的沉积层段。为了深入研究下马岭组烃源岩的分子指纹特征,对华北中元古界下马岭组海相低熟灰质泥页岩进行了沥青质抽提、GC-MS分析。样品饱和烃的GC-MS分析数据显示,烃源岩的沉积环境为微咸化浅海/滨海相还原环境,母质输入以原核生物为主,演化程度低,未检出甾烷。表明前寒武纪地层是以原核生物为主要有机质物源的沉积岩,在一定的条件下,也可以成为好的烃源岩,具有良好的原生油气资源前景。
The Middle-Proterozoic has the oldest and non-metamorphic sedimentary system, and its primary hydrocarbon is a field of energy resources worthy of attention. The Middle-Late Proterozoic strata in North China are widely distributed and thick, and the age of strata is old. The Xiamailing Formation of the Qingbaikou system in the lower garden of Zhangjiakou is a sedimentary layer relatively rich in marine organic matter from the Proterozoic to the Lower Paleozoic in North China segment. In order to further study the molecular fingerprint of the source rocks of the Xiamaling Formation, the asphaltene was extracted and analyzed by GC-MS. GC-MS analysis of the sample saturated hydrocarbons showed that the sedimentary environment of the source rocks is a saltwater / coastal facultative reduction environment, and the input of the parent material is mainly prokaryotes with low evolution and no sterane was detected. It shows that the Precambrian strata are sedimentary rocks based on prokaryotes as the main organic matter source. Under certain conditions, they can also be good source rocks with good prospect of primary oil and gas resources.