塔里木盆地原油中芳基类异戊二烯烃的检出及其地质意义  

Aryl-Isoprenoids in Crude Oil and Its Implication in Geological Exploration

作　　者：孙永革[1] 肖中尧[1] 徐世平[1] 卢鸿[1] 柴平霞[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640

出　　处：《新疆石油地质》2004年第2期215-218,共4页Xinjiang Petroleum Geology

基　　金：国家"973"项目;中国典型叠合盆地混合油气源对比与成藏年化学研究(编号:G1999043308)

摘　　要：研究表明,沉积有机质中芳基类异戊二烯烃化合物是光合绿硫细菌Chlorobiaceae的成岩转变产物,指示源岩形成于水体分层的强还原环境。塔里木盆地台盆区海相原油中普遍检出含量丰富的C10—C23系列芳基类异戊二烯烃化合物,原油沥青质裂解产物也显示出绿硫细菌来源的典型标志:C2—C5烷基苯系物中具有高丰度四甲基苯异常分布特征。这些特征揭示塔里木盆地台盆区海相主力油气源岩除了目前所认识的,以上升洋流模式为主导形成的中、上奥陶统台缘斜坡灰泥丘相沉积外,至少还存在一套水体分层厌氧沉积模式下发育的重要烃源岩。Investigations of aryl-isoprenoids in sedimentary organic matter suggest that these compounds are the diagenetic products of certain precursors from photosynthetic green sulphur bacteria Chlorobiaceae,indicating that its source rock was formed in an intense reductive environment.Marine oils from the tableland-basin region in Tarim basin generally contain abundant aryl-isoprenoids with the carbon number range of C10～C23.The pyrolytic products of the bitumen fraction in the oils are also characterized by a typical sulphur bacteria origin,i.e.,an abnormal enrichment of tetra-methyl benezenes in the C2～C5alkyl benzene fraction.These data indicate that the major marine oil and gas were originated at least from one set of the important source rocks developed in a water-layered anaerobic sedimentary environment in the tableland-basin region of Tarim basin,in addition to the consensus that they were derived from the Upper-Mid Ordovician sedimentary rocks with clay-mottar dome facies controlled by the upwelling ocean current in an incline at the platform margin.

关 键 词：芳香烃 沉积有机质 塔里木盆地 海相原油 

分 类 号：P618.130.1[天文地球—矿床学]