准噶尔盆地玛湖凹陷二叠系烃源岩三环萜烷分布样式及影响因素

发布时间：2018-05-14 13:54

本文选题：三环萜烷 + 生物标志物　；参考：《石油与天然气地质》2017年02期

【摘要】：准噶尔盆地西北缘原油及烃源岩中生物标志物以高丰度的三环萜烷系列为典型特征,其分布样式的差异一直被当作研究本区原油成因类型及油-源对比的典型指标。通过对烃源岩样品的系统地球化学分析,认为本区风城组源岩(P_1f)主要以三环萜烷(C_(20),C_(21),C_(23))呈"上升型"为特征,泥质岩类与碳酸盐岩类相比C24,C25三环萜烷含量较高;下乌尔禾组(P_2w)源岩和佳木河组(P_1j)源岩样品三环萜均呈"下降型"分布特征。通过对源岩镜下进行观察和加水热模拟实验等方法,分别探讨了沉积环境与母质类型、成熟度及排烃作用对三环萜分布样式的影响,认为P_1f和P_2w源岩中三环萜烷的分布主要受控于沉积环境和母质类型的原生差异。P_1f源岩有机质多源于本地沉积的藻类及细菌,沉积环境属于蒸发、还原的咸化湖沉积;P_2w源岩中外来有机质含量相对较多,沉积环境属于淡水还原环境。P_1j源岩整体热演化程度较高,有机质炭化作用强烈;埋藏成熟演化在有机质处于成熟-高熟阶段内对三环萜烷分布样式影响不大,若达到过熟阶段则会造成低碳数三环萜烷(C_(20),C_(21))含量增加;排烃作用对三环萜烷影响相对较小,不改变其分布样式。
[Abstract]:The biomarkers in crude oil and source rocks in the northwestern margin of Junggar Basin are characterized by high abundance tricyclic terpene series, and the differences of their distribution patterns have been used as a typical index to study the genetic types of crude oil and oil-source correlation in this area. Based on the systematic geochemical analysis of source rock samples, it is considered that the source rock PSP _ 1f of Fengcheng formation in this area is mainly characterized by "ascending" type of tricyclic terpene C _ (20) C _ (20) C _ (1) C _ (21) T _ (23), and the content of C _ (24) C _ (25) tricyclic terpene is higher in argillaceous rocks than in carbonate rocks. The tricyclic terpenes in the source rocks of the Lower Wuerhe formation and the Jiamuhe formation are of "descending" type. The effects of sedimentary environment, parent material type, maturity and hydrocarbon expulsion on the distribution patterns of tricyclic terpenes were discussed by means of observation and hydrothermal simulation under source rock microscope. It is considered that the distribution of tricyclic terpene in P1f and P2w source rocks is mainly controlled by the primary difference between sedimentary environment and parent material types. The organic matter of P1f source rocks is mostly derived from native sedimentary algae and bacteria, and the sedimentary environment is evaporation. The content of organic matter in the source rocks of the reduced saline lake is relatively high, and the sedimentary environment belongs to the freshwater reduction environment. P1j source rocks have a relatively high thermal evolution degree and strong carbonization of organic matter. The buried maturity evolution has little effect on the distribution patterns of tricyclic terpenes during the maturation to high maturity stage of organic matter, and if it reaches the over-mature stage, it will result in an increase in the content of low carbon tricyclic terpene C _ (20) C _ (20) and C _ (20) C _ (20) C _ (20) C _ (20) C _ (20) C _ (21). Does not change its distribution style.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油勘探开发研究院;中国石油新疆油田公司实验检测研究院;
【基金】：国家科技重大专项(2016ZX05001005) 中石油新疆油田公司课题(2014-C4023)
【分类号】：P618.13

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