伊犁盆地二叠系烃源岩沉积环境

Sedimentary environment of Permian source rocks in Yili basin

苗建宇 周立发 邓昆 李剑锋 韩中原

Miao Jianyu Zhou Lifa Deng Kun Li Jianfeng Han Zhongyuan

据不同岩类烃源岩有机碳含量分布、饱和烃气相色谱及有机质类型等特征,研究了烃源岩的沉积环境,分析了沉积环境对有机质丰度和类型的影响。研究认为,伊犁盆地二叠系烃源岩主要集中在塔姆齐萨依组和巴斯尔干组,沉积时总体具温带气候特征,水体的古盐度较高,水介质条件呈弱碱性-碱性,沉积环境为弱还原-还原相。其中还原程度强、具一定深度水体的沉积相带是原始有机质沉积的良好场所,沉积有机质能及时沉积、保存下来。因此,烃源岩有机质丰度普遍较高,类型好;反之,则明显变差。

Based on TOC distribution, gas chromatograms of saturated hydrocarbons and types of organic matter in various source rocks, this paper studies sedimentary environments of source rocks and their effects on abundance and types of organic matter. Source rocks in Yili basin are mainly distributed in the Permian Tamuqisayi and Basiergan Formations deposited in a weakly reducing to reducing environment in temperate climate,where the water body is characterized by relatively high palaeo-salinity with faintly alkaline to alkaline aqueous medium. Sedimentation zones with strong reduction and relatively deep water body are favorable places for deposition and preservation of original organic matters, thus the source rocks have abundant organic matters of favorable types.

10.11743/ogg20040311