Comparison of Multiple Occurrence Biomarkers of Core and Outcrop in Gaoyuzhuang and Hongshuizhuang Fm, Jibei Sag
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摘要: 利用气相色谱—质谱联用仪对采自燕山地区冀北凹陷的中元古界长城系高于庄组(Chg)灰岩和蓟县系洪水庄组(Jxh)泥页岩露头和岩芯中不同赋存状态生物标志物进行了分析。正构烷烃和萜类生物标志物显示从高于庄组(Chg)到洪水庄组(Jxh)生源由浮游类和底栖类为主转变为浮游类为主，而沉积水体的盐度则由高变低。露头样品和相应岩芯中生物标志物的对比显示，风化等因素对该区烃源岩露头中藿烷类生物标志物影响较小，而对正构烷烃和甾烷的分布模式有影响。灰岩样品中不同赋存状态生物标志物变化不大，而泥页岩结合态相对于游离态具有相对较高含量的长链正构烷烃，显示酸性条件可以降低泥页岩对有机质的吸附能力。Abstract: Using gas chromatographymass 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 nalkane 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 longchain nalkanes. 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 nalkanes released, indicating acidic environment can reduce the shale adsorption capacity of organic matter and destroy organic clay complex. -
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