西藏措勤盆地它日错地区多尼组烃源岩生物标志物特征  

The Biomarkers Characteristic of Source Rocks of Duoni Formation in Taricuo Area,Cuoqin Basin

作　　者：杨珍[1] 杨文光[1] 谢龙 王秋根[1] 欧阳慧子[1] 陈庆[1] 柳树权 YANG Zhen;YANG Wen-guang;XIE Long;WANG Qiu-gen;OUYANG Hui-zi;CHEN Qing;LIU Shu-quan(Institute of Sedimentary Geology,Chengdu University of Technology, Chengdu 610059, P.R. China;College of Earth Sciences,Chengdu University of Technology, Chengdu 610059, P.R. China)

机构地区：[1]成都理工大学沉积地质研究院,成都610059 [2]成都理工大学地球科学学院,成都610059

出　　处：《科学技术与工程》2017年第36期158-165,共8页Science Technology and Engineering

基　　金：措勤盆地它日错地区石油地质走廊大剖面调查项目(1212011120979);冈底斯-喜马拉雅铜矿资源基地调查项目(DD20160015);国家自然科学基金(41002055);教育部博士点基金(20125122110010)资助

摘　　要：运用质谱色谱技术,对采自西藏措勤盆地它日错地区多尼组烃源岩生物标志物的有机质生源构成、沉积环境和成熟度进行了分析。分析结果表明:西藏措勤盆地它日错地区多尼组烃源岩的碳数值分布在nC_(15)~nC_(33),以"前峰型"单峰为主。正构烷烃碳数相对较高,表明遭受了一定程度的微生物降解;样品中检测出了伽马蜡烷且Pr/Ph值约为0.80,反映了较咸水还原的沉积环境;三环萜烷/五环三萜值小于1,且规则甾烷以C_(27)略占优势,说明有机母质主要来源于水生低等藻类生物,部分有机质具有混合来源;成熟度参数OEP为0.99~1.61,平均1.16,Ts/(Tm+Ts)为0.47~0.67,C_(29)-β/(αα+ββ)值为0.32~0.54及C_(29)-20S/20(S+R)值为0.31~0.49,显示多尼组烃源岩有机质热演化程度已达到高成熟阶段。The organic matter composition,sedimentary environment and maturity of the biomarkers of Duoni Formation source rocks from the Taricuo area in the Cuoqin Basin,Tibet,were analyzed by mass spectrometry.The results show:the carbon number distribution of the source rocks in Duoni Formation in the Cuoqin Basin,Tibet,is mainly in nC15~nC33,with the“front peak type”single peak.The number of n-alkanes is relatively high,indicating a certain degree of microbial degradation.Gammacerane and the Pr/Ph value of about080are detected,reflecting the depositional environment of saltwater reduction.Tricyclic terpane/pentacyclic triterpene value is less than1,and the regular sterane to C27slightly dominant,indicating that the organic parent material is mainly derived from aquatic low algae biological,part of the organic matter with a mixed source.The maturity parameter OEP is0.99~1.61on average1.16,Ts/(Tm+Ts)is0.47~0.67,C29β/(αα+ββ)is0.32~0.54and C2920S/20(S+R)is0.31~0.49,indicating that the thermal evolution of the organic matter of the source rocks of Duoni Formation has reached the high maturity stage.

关 键 词：烃源岩 生物标志物特征 多尼组 它日错地区 措勤盆地 

分 类 号：TE112[石油与天然气工程—油气勘探]