额济纳旗芦草井中二叠统菊石滩组发育厚度较大的暗色泥岩,TOC含量平均值达0.5%,C(29)ααα-20R/(20S+20R)与C(29)ββ/(αββ+ααα)生物标志化合物参数表明该烃源岩处于成熟-高成熟阶段,有利于油气的生成.分析其沉积环境,了解有利烃源岩沉积相带展布,对额济纳旗及其邻区晚古生代石炭一二叠系裂谷(裂陷)盆地油气勘探具有重要的意义.根据研究区菊石滩组岩性组合特征、沉积特征和生物标志化合物特征,结合区域构造演化特征综合分析中二叠统沉积环境,通过分析甾烷C(27)、C(28)、C(29)纵向上相对百分含量分布特征和类异戊二烯烃姥鲛烷(Pr)和植烷(Ph)比值,建立其与沉积环境的关系,从而探讨生物标志化合物特征在沉积环境分析中的应用.%In Lucaojing area of Ejinaqi, the dark mudstone with a extreme thickness in Jushitan Formation of Middle Permian series is well developed. its TOC content reaches 0. 5％, and the parameters of C29ααα-20R/ (20S＋20R) and C29αββ/ (αββ＋ααα) Biomarker show that the source rock is mature-high mature,which is beneficial for hydrocarbon generation. In this paper , we analyze the sedimentary environment in order to investigate the extension of sedimentary facies belts benefitting for source rocksbecause the investigation has an important significance to oil and gas exploration about rift basin of Carboniferous-Permian in Ejinaqi and its adjacent area。 According to lithologic association, sedimentary characteristics,biomarker characteristics, and regional tectonic evolution, we research the middle Permian series sedimentary environment. Through the analysis about distribution of C27 , C28, C29 Sterane and the ratio of the pr to Ph of the isoprenoid, we build the relation between it and sedimentary environment. By doing so,we can discuss the application of the sedimentary environment through biomarker characteristics.
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