生物标志化合物在地层划分与对比中的应用——以塔里木盆地下古生界为例  

BIOLOGICAL MARKERS APPLICATION IN STRATIGRAPHIC DIVISION AND CORRELATION——TAKE LOWER PALEOZOIC STRATA IN TARIM BASIN AS EXAMPLE

作　　者：陈世加[1] 沈昭国[1] 傅晓文[1] 王绪龙 黄第藩[3] 李小地[3] 

机构地区：[1]西南石油学院勘探系,四川南充637001 [2]新疆石油勘探公司勘探开发研究院,新疆克拉玛依834000 [3]北京石油勘探开发科学研究院,北京100083

出　　处：《地层学杂志》2001年第4期288-291,293,共5页Journal of Stratigraphy

基　　金：九五国家重点科技攻关项目"塔里木盆地特殊天然气成因类型及分布规律"( 96-111-0 1-0 6-0 1)的部分内容 ;西南石油学院"油气藏地质与开发工程"国家重点实验室开放基金 ( PL N990 5 )资助

摘　　要：生物标志化合物是指沉积岩或原油和煤中碳—碳骨架稳定的特征化合物 ,它通常是用于油源对比和古沉积环境的恢复。本次研究在地层划分与对比中尝试利用正常甾烷分布的差异 ,研究表明 ,塔里木盆地寒武系—下奥陶统和中上奥陶统的甾烷分布特征完全不同 :前者的 C2 8甾烷含量高于后者 ,正常甾烷的分布是 C2 9>C2 8>C2 7,呈反“L”型分布 ;后者的 C2 7甾烷含量高于前者 ,甾烷的分布是 C2 9>C2 7>C2 8,呈“V”字型分布。寒武系—下奥陶统和中上奥陶统甾烷分布由反“L”型变为“V”型 ,说明生物在演化过程中 ,有机质的来源及化学结构组成发生了明显变化 ,据此可用于塔里木盆地下古生界的地层划分与对比。Biomarkers are stable compounds of carbon-carbon skeleton in the sedimentary rocks or oil,and are usually used in oil correlation and paleoenvironmental reconstruction.An attempt to use biomarkers to divide and correlate strata is made in the paper.The studies show that the regular sterane distribution during the Cambrian—Lower Ordovician in the Tarim Basin was quite different from that during the Middle—Upper Ordovician.The former shows a C 28 sterane content higher than the latter,and the regular sterane has an inverted “L” pattern distribution of C 29>C 28>C 27.The latter has a C 27 sterane content higher than the former and the sterane has a “V” pattern distribution of C 29<C 27<C 28.During the Cambrian—Lower Ordovician and the Middle—Upper Ordovician the sterane distribution changed from the inverted “L” into a “V” pattern,showing that during the evolutionary process of organisms,the organic chemical structure components obviously changed.This may be used in the Lower Paleozoic stratigraphic division and correlation in the Tarim Basin.

关 键 词：塔里木盆地 新疆 寒武系 奥陶系 甾烷分布 化学结构 地层划分 生物标志化合物 下古生界 

分 类 号：P534.4[天文地球—古生物学与地层学]