Comparison of Multiple Occurrence Biomarkers of Core and Outcrop in Gaoyuzhuang and Hongshuizhuang Fm, Jibei Sag

Key words: 
• biological markers /
• weathering /
• organic matter occurrence state /
• gas chromatography mass spectrometer /
• Proterozoic strata

Abstract: Using gas chromatographymass spectrometer analyzed biological markers of Changcheng System Gaoyuzhuang Group (Chg) limestone and Jixian System Hongshuizhuang Group (Jxh) shale both outcrop and core, which are collected from Jibei depression in Yanshan
area. Gaoyuzhuang (Chg) limestone and Hongshuizhuang group (Jxh) mudstone alkanes and diterpenoid biomarkers comparison shows the genetic source from the plankton and the benthic pelagic zooplankton class to plankton and depositional environment changed from high salinity to lower process. Outcrop samples and the corresponding core in the comparison of biological markers in the area show the role of environmental factors such as the weathering affecting less of hopane biomarkers, while affecte the nalkane distribution patterns and the distribution of steranes larger. Occurrence of limestone samples of different biomarker little change, and shale in the bonding state relative to states with high content of free longchain nalkanes. The results showed that limestone has a high number of parcels in the state of organic matter, acid treated shale has a relatively high content of high molecular weight nalkanes released, indicating acidic environment can reduce the shale adsorption capacity of organic matter and destroy organic clay complex. 