Characteristics of Biomarkers in Saturated Hydrocarbon in Coal of  Carbonaceous Mudstone and Oils from the Lower Jurassic Coal  Measures in the Turpan Basin

Key words: 
• coal /
• carbonaceous mudstone /
• oils /
• biomarker

Abstract: Saturated hydrocarbon of coal，carbonaceous mudstone and oils from the Lower Jurassic coal measures in the Turpan basin have been analyzed by GC/MS in this paper，and biomarker characteristics and coal thermal maturity analyzed to draw the following conclusions：There are many similar biomarker characteristics between oil from middlelower Jurassic of Turpan Basin and coal and carbonaceous mudstone in the same strata. They all contain specific rlupane, Inorbietane,C24tetracyclic and high content of C29steranes. These characteristics suggest that they should have similar matter source of the organic matter are derived from matter with abundant high plants. Meanwhile, biomarkers, often used to indicate depositional environments, is characterized by high Pr/Ph ratio, little or no gammacerane and high abundance dibenzofurans, such biomarker distributions are indicative of suboxic and freshwater environment. Although coal and carbonaceous mudstone〖KG1〗remain in lower thermal maturity (Ro=0.47~0.53), but C29ββ／（αα＋ββ）sterane ratio (0.2940.489) and bezohopane are detected in this study. Because these fearture are related to bacterial activity, so bacterial degradation of organic matter may play an important role in coalderived oil.