柴达木盆地东部侏罗系煤系烃源岩生烃潜力评价及地球化学特征

陈中红, 等。吉林大学学报（地球科学版），2006，36，24-28

中图分类号: P618. 13　　　　文献标识码:A

 对柴达木盆地东部地区侏罗系的大煤沟剖面、绿草山剖面进行了露头取样，并利用Rock-Eval生油岩评价仪、色谱—质谱仪、稳定同位素质谱仪等实验分析测试技术对样品进行了地球化学特征分析。实验结果表明，样品有机碳含量变化从0.07%到56.8%，有机质类型以Ш型有机质为主，少数为Ⅱ型有机质，极少数为Ⅰ型有机质，灰黑色油页岩及黑色炭质页岩是侏罗系中的优质烃源岩。检测样品C₂₉甾烷异构化参数C₂₉αββ/(αββ+ααα)、C₂₉ααα20S/(20S+20R)分布范围分别为0.25~0.35、0.06~0.34，处于未熟-低熟状态。侏罗系水体环境较浅，多为滨浅湖与沼泽环境，具有煤系烃源岩特点，局部为水体比较咸化的半深湖-深湖环境。

关键词：柴达木盆地，侏罗系，烃源岩地球化学，单体烃同位素，生物标志化合物

Sedimentary Environments and Generation Potentials of the Possible Source Rocks in Jurassic System in the Eastern Qaidam Basin, China 

Chen Zhonghong, et al，Journal of Jilin University(Earth science)2006，36，24-28

(China University of Petroleum, Dongying, Shandong, 257061, China)

In order to the investigation on the Sedimentary Environments and Generation Potentials of the Possible Source Rocks in the Jurassic System in the Eastern Qaidam Basin, the rock samples selected from the outcrop in the Jurassic System were analyzed including the organic carbon content, the parameters of pyrolysis, biomarker characters of saturated hydrocarbon and stable carbon isotope quality of individual n-alkanes by means of Rock-Eval, GC-MS, GC-MS-MAT and so on. The results showed that: the content of organic carbon ranged from 0.07% to 56.8%, most of the source rocks were type Ш of kerogen, a few of the source rocks were type Ⅱ of kerogen and few was type Ⅰ of kerogen. Gray-black oil shale and black charcoal shale were high quality source rocks in Jurassic system comparatively. The value of the parameters of αααC₂₉20R/20（R+S）and C₂₉ββ/（αα+ββ）was 0.06~0.34  and 0.25~0.35, and the organic matter was being in the stage of low maturity. The organic matters were mostly deposited in an environment of lake beach, shallow lake and marsh with oxidation, showing the characters of coal-measure rocks. A few of rock samples revealed a reducing environment of semi-deep lake or deep lake with high salty and water column stratification.

Key words: Qaidam Basin, source rocks, sedimentary environment, bio-marker, carbon isotope

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