南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (6): 924933.doi: 10.13232/j.cnki.jnju.2019.06.005
摘要:
沙三段烃源岩是渤南洼陷的主力烃源岩.为了研究该套烃源岩不同发育区的地球化学特征,建立区域沉积环境和地球化学特征之间的关系,筛选伽马蜡烷指数、C35/C34藿烷、C29/C30藿烷、Ts/Tm等地化指标进行对比,分析了渤南洼陷沙三下烃源岩沉积环境的横向与纵向差异性以及各类沉积环境与地化参数的关联性.研究认为,纵向上由早期还原性半咸水深湖相到晚期微咸水半深湖相的变化沉积序列,具有伽马蜡烷指数、C35/C34藿烷、C29/C30藿烷降低,Ts/Tm增大的特征;横向上以沙三段13砂组为例,结合不同区的沉积环境,划分了微咸水陆源相、半咸水混源相、半咸水深湖相、微咸水混源相四种沉积有机相,各沉积有机相的地化指标的高低与岩相、水体环境等具有明显的相关性.通过研究建立了较为明晰的沉积环境?地化特征对应关系,为开展精细油源对比提供依据.
中图分类号:
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