彩南油田多源混合原油的油源(二)——原油地球化学特征、分类与典型原油油源  

Oil-source correlation of mixed oils derived from multiple source rocks in the Cainan Oilfield, Junggar Basin, Northwest China. Part Ⅱ : Geochemical characteristics, typing and oil sources of typical crude oils

作　　者：陈建平[1] 梁狄刚[1] 王绪龙[2] 邓春萍[1] 薛新克[2] 靳涛[2] 宋孚庆[1] 钟宁宁[3] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油新疆油田分公司 [3]CNPC油气地球化学重点实验室

出　　处：《石油勘探与开发》2003年第5期34-38,共5页Petroleum Exploration and Development

基　　金：国家自然科学基金(49873001);中国石油天然气股份有限公司科技项目(010109-3)

摘　　要：根据准东地区各油田原油的碳同位素、生物标志化合物组成特征等,可将该地区原油分为5类。第一类原油的全油碳同位素值一般小于—30‰,Pr/Ph值一般小于2.0,富含β-胡萝卜烷、三环萜烷、伽马蜡烷以及C_(28)、C_(29)甾烷,而C_(27),甾烷含量很低、几乎不含重排甾烷,来源于二叠系烃源岩;第二类原油的全油碳同位素组成与第一类原油类似,但特别富含Ts、C_(29)TS和重排甾烷,而伽马蜡烷含量低,与三叠系烃源岩的亲缘关系很好;第三类原油的全油碳同位素明显重于第一、第二类原油,δ^(13)C值一般大于—28‰,且Pr/Ph值一般大于3.0,富含五环萜烷和C_(29)甾烷,而三环萜烷、伽马蜡烷、C_(27)和C_(28)甾烷含量低。三环萜烷中以低碳数的C_(19)、C_(20)三环萜烷为主,来源于侏罗系烃源岩;第四类原油地球化学特征介于上述3类原油之间,与4套已知烃源岩均没有明确的油源关系;第五类原油碳同位素特别重,δ^(13)C值一般大于—25‰,与其它原油差异很大,来源于石炭系烃源岩。Using carbon isotopic and biomarker data, the crude oils in the studied area can be divided into five groups. The first is derived from the Permian source rocks, with δ13 C values generally less than - 29‰, Pr/Ph ratios less than 2, rich in β-carotane, tricyclic terpanes, gammacerane and C28 and C29 steranes, contain almost no diasteranes and a low content of C27 steranes. The second is from the Triassic source rocks, which is similar to the first group in carbon isotopic composition, but is characteristically rich in Ts, C29 Ts and diahopanes, and low gammacerane contents. The third group is generated from the Jurassic source rocks, and characterized with δ13C values ranging from - 28‰ to - 25‰, Pr/Ph ratios generally greater than 4.0, rich in pentacyclic hopanes and C29 steranes, but poor in tricyclic terpanes, gammacerane, and C27 and C28 steranes. The geochemical properties of the fourth group of oils are intermediate between the properties of typical Permian, Triassic and Jurassic oils, and which have little correlation with any of the four known source rocks in the basin. The fifth group of crude oils is isotopically heavy, and originated from Carboniferous source rocks.

关 键 词：准噶尔盆地 原油 碳同位素 生物标志化合物 油源对比 侏罗系 三叠系 二叠系 

分 类 号：TE122.1[石油与天然气工程—油气勘探]