焉耆盆地侏罗系煤系源岩评价与成烃机理研究

Assessing on Source Rocks in Jurassic Coal Measure and Study on Hydrocarbon Generation Mechanism in Yanqi Basin

在对焉耆盆地已钻探井暗色泥岩、碳质泥岩等生油岩和部分原油样品地球化学分析的基础上 ,结合构造 ,特别是沉积和岩相古地理特征 ,研究了烃源岩类型及空间展布 ,煤系源岩有机显微组分组成及生烃机理 ,有机质丰度、类型及成熟度特征 ,指出烃源岩类型属典型的腐殖型 ;侏罗系八道湾组、三工河组和西山窑组煤系泥岩、炭质泥岩及煤均能生烃 ,但以侏罗系八道湾组煤系泥岩为主要烃源岩 ;博湖坳陷南、北凹陷都经历过油气形成过程 ,但北部凹陷存在两个生油阶段 ,而南部凹陷仅存在一个生油阶段。

Based on the geochemical analysis of dark argillite ,carbonaceous mudstone and crude oil samples, the tectonic and sedimentary characteristics has als o been studied. The type of source rocks, organic maceral constituent of coal me asure source rocks, hydrocarbon generation mechanism and organic abundance, type and maturity characteristics have been analyzed. The result shows that the type of source rocks are typical humics and the coal measure argillite,carbonaceous mudstone and coal of Badaowan Formation, Sangonghe Formation and Xishanyao For mation could produce hydrocarbon, especially in Badaowan and it is the main sour ce rocks. There existed the processes of hydrocarbon formation in both south sag and north sag in Bohu depression. One stage of hydrocarbon generation existed i n south sag and two stages in north sag.