邦戈尔盆地中部凹陷K组烃源岩饱和烃生物标志物特征研究

Geochemical Characteristics of the Saturates on Source Rock of the K Formation in Central Sag of Bongor Basin

邦戈尔盆地勘探程度低,对其主要烃源岩层位特征的认识不能满足勘探的需要。利用中部凹陷探井烃源岩样品的饱和烃色谱-质谱分析资料,对K组烃源岩的饱和烃生物标志物特征进行了系统分析,结果表明,中部凹陷K组烃源岩沉积于半咸水-淡水、弱氧化-弱还原的湖相沉积环境,沉积有机质为湖相混合型有机质。3个烃源岩样品饱和烃生物标志物组成特征的差异性表明,不同区域、不同层段的沉积环境和物源由于构造运动的影响还是有一定的差别。

Because of low level of oil and gas exploration,the research on the characteristics of the main resource rock can'tneeds of exploration in Bongor Basin.The saturated GC-MS data of the source rock are used in exploratory well of central Sag,the geochemical characteristics of the saturated Source Rock of K Formation are researched.The results shows that the mudstone of K Formation is deposited in fresh water-weak salt water and in weak oxidation-weak reducting lacustrine facies sedimentary environment.The organic type is mainly typeⅡ.The distribution differences of the saturates biomarkers among the 3 resource rock samples indicate that the sedimentary environment and material sources have little difference between the different subordinate layers and different structural positions as the result of the tectonic movement.