内蒙古西部额济纳旗及其邻区石炭系-二叠系烃源岩的发育特征和生烃潜力评价

定量评价盆地的烃源岩生烃潜力是油气勘探首先要解决的问题之一.采用多项有机质丰度、类型和成熟度指标定量或定性地分析了额济纳旗及邻区石炭系-二叠系烃源岩的生烃潜力,证实额济纳旗及邻区的石发系-二叠系发育了浅海陆棚相以泥页岩为主的烃源岩.研究表明,该区石炭系-二叠系的阿木山组、埋汗哈达组和哈尔苏海组3套烃源岩,厚度大,有机质丰度较高,有机质类型以Ⅲ型为主,热演化程度与构造活动、埋藏深度有关,多数有机质演化程度处于成熟阶段,显示区内石炭系-二叠系具有良好的油气资源前景.

Development characteristics and hydrocarbon generating potential evolution of Permian-Carboniferous source rocks in Ejina Banner basin and its adjacent area, western Inner Mongolia, China

Quantitatively estimating the hydrocarbon generating potential evolution of source rocks is the first problem for petroleumexploration. Using organic matter abundance, organic matter type and organic matter maturity index the authors studied hydrocarbongenerating potential evolution quantitatively or qualitatively. It is firstly confirmed that Ejina Banner basin and its adjacent areas developPermo-Carboniferous source rocks of shallow-marine shelf phase sedimentary mud shale. Research results show that there are threesets of source rocks of Permo-Carboniferous in the areas, such as Amushan Formation, Maihanhada Formation and Haersuhai Formation. The thickness of source rocks are large, and the rocks have higher organic matter abundance. The main type of the Kerogen is type Ⅲ. Thermal evolution degree is related to tectonic activity and buried depth. Most of organic matter is in the phase of maturation,which shows that there are favorable hydrocarbon prospects in Permo-Carboniferous in the areas.