川中地区侏罗系烃源岩和原油中三环萜烷分布特征及指示意义  

DISTRIBUTION AND INDICATION OF TRICYCLIC TERPANE IN JURASSIC SOURCE ROCKS AND CRUDE OIL IN CENTRAL SICHUAN BASIN

作　　者：杨岩岩 唐友军[1,2] 洪海涛 李美俊 吴长江 张吉振 卢晓林 YANG Yan-yan;TANG You-jun;HONG Hai-tao;LI Mei-jun;WU Chang-jiang;ZHANG Ji-zhen;LU Xiao-lin(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;College of Resources and Environment,Yangtze University,Wuhan 430100,China;Exploration and Development Research Institute of Southwest Oilfield Branch,PetroChina Co.,Ltd.,Chengdu 610041,China;State Key Laboratory of Petroleum Resources and Prospecting/College of Geosciences,China University of Petroleum,Beijing 102249,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]长江大学资源与环境学院,湖北武汉430100 [3]中国石油西南油田分公司勘探开发研究院,四川成都610041 [4]中国石油大学油气资源与探测国家重点实验室/地球科学学院,北京102249

出　　处：《地质与资源》2023年第6期743-749,共7页Geology and Resources

基　　金：国家自然科学基金项目“苯基多环芳烃检测及其石油地球化学意义”(41972148);国家自然科学基金重点项目“深层油气的来源和演化:单体化合物和硫碳同位素限定”(41730424).

摘　　要：借助气相色谱-质谱技术,通过对川中地区侏罗系大安寨段烃源岩及原油样品的系统地球化学分析,揭示了生物标志物中三环萜烷系列的分布特征,并探讨了其对于沉积环境和生物来源的指示意义.结果表明:大安寨段烃源岩及原油姥植比Pr/Ph中等,C_(19)—C_(26)三环萜烷呈现C_(21)优势.C_(19+20)和C_(23)的相对百分含量较低,C_(24)TeT/C_(26)TT值大于1,指示大安寨段沉积时期水体较浅,生源构成以菌藻生源为主,兼有丰富的高等植物生源的混源输入,形成于弱还原的淡水湖相环境.The distribution characteristics of tricyclic terpenes in biomarkers and their indicative significance for sedimentary environment and biological sources are discussed through the systematic geochemical analysis of source rocks and crude oil samples from Jurassic Da’anzhai Member in central Sichuan Basin by gas chromatography-mass spectrometry(GC-MS).The results show that the Pr/Ph ratios of source rocks and crude oil are medium level,with C_(19)-C_(26) tricyclic terpenes showing the dominance of C_(21),low relative percentages of C_(19+20) and C_(23) contents,and C_(24)TeT/C_(26)TT value greater than 1,indicating that the water was shallow during the sedimentary period of Da’anzhai Member,and the biogenesis was mainly bacteria and algae,with rich mixed-source input of higher plants,which was formed in the weak reduction environment of freshwater lake facies.

关 键 词：烃源岩 三环萜烷 沉积环境 大安寨段 侏罗系 川中地区 

分 类 号：P593[天文地球—地球化学] P618.13[天文地球—地质学]