沉积学报2001，Vol.19Issue(2)：287-292,6.
藏北高原双湖地区中侏罗统海相油页岩生物 标志化合物分布特征及其意义
Characteristics of Biomarker Compounds and Its Implication of Middle Jurassic Oil Shale Sequence in Shuanghu Area, Northern Tibet Plateau
摘要
Abstract
Abundant biomarkers, including n-alkanes, isoprenoid, steranes and terpanes, ha v e been detected by GC-MS from the middle Jurassic oil shales in the Shuanghu ar ea, n orthern Tibet plateau.N-alkanes contain carbon number nC12-nC 35 with a relativel y wide range,nC15, nC16 or nC17 as the highest pea k. Examination of the relative abundance show a dominance of low carbon molecular components in the n-alkane . Pr/Ph ratio in oil shales range from 0.77 to 1.59, and it fluctuates in the vert ical section. The upper and lower part of the oil shales have slight predominanc e of pristane, whereas phytane dominates in the middle part of the oil shale seq uence. C30-hopane is the most abundant in the hopane series. According to the relat ively abundance, pentacyclic triterpane > tricyclic terpane > quartcyclic terpan e. Sterane ΣC27/ΣC29 ratio ranges from 0.79 to 1.20, and Σ(C2 7+C28) > ΣC29. The carbon number distribution of the steranes show a slight predominance of C 27 components over C29 in the lower part of the oil shales and a slight domi nance of C29 component over C27 in the upper part of the oil shales sequen ce. C27-dias terane/ C27-sterane ratio range from 0.51 to 3.63, which also fluctuate in the v ertical section. It indicates organic matter of algael origin, with proper ratio contribution from terrestrial sources. The organic matter in the oil shales is mature. Different Pr/Ph and C27-diasteranes/C27-steranes proved e specially usefu l in assessing variation in depositional environment and recognizing preservatio n potential of the organic matter.关键词
生物标志化合物/有机质成熟度/沉积环境/海相油页岩/中侏罗统/藏北双湖分类
能源科技引用本文复制引用
林金辉,伊海生,李勇,王成善,彭平安..藏北高原双湖地区中侏罗统海相油页岩生物 标志化合物分布特征及其意义[J].沉积学报,2001,19(2):287-292,6.基金项目
国家重点基础研究发展计划项目 （）
