彩南油田:一个典型三元混合油田  

The Cainan Oilfield: A Typical Mixed Crude Oil of Three-endmember

作　　者：陈建平[1] 邓春萍[1] 梁狄刚[2] 王绪龙[3] 石新璞[3] 靳涛[3] 钟宁宁[4] 

机构地区：[1]中国矿业大学煤炭资源教育部重点实验室,北京100083 [2]中国石油天然气集团公司油气地球化学重点实验室 [3]中国石油天然气股份有限公司新疆油田分公司,新疆克拉玛依834000 [4]中国石油天然气集团公司 油气地球化学重点实验室

出　　处：《沉积学报》2004年第B06期91-97,共7页Acta Sedimentologica Sinica

基　　金：国家自然科学基金(批准号:49873001)中国石油天然气股份有限公司(010109-3)联合资助项目部分成果

摘　　要：准噶尔盆地东部地区存在石炭系、二叠系、三叠系和侏罗系四套烃源岩,具有形成混合原油的地质、地球化学条件。大量原油碳同位素、生物标志物组成特征等分析表明,该地区原油可划分成五种类型,其中四种类型的原油分别来源于二叠系、三叠系、侏罗系和石炭系。彩南油田原油属于特殊类型原油,其地球化学特征与其它类型原油均不相同,与该区域内四套烃源岩均没有明确的油源关系。根据原油碳同位素和生物标志物分布特征等结合生烃历史分析,该类原油属于二叠系、三叠系和侏罗系原油的混合原油,主要来源于阜康凹陷,彩南油田属于典型的三元混合原油构成的油田。There are four generative hydrocarbon source rocks of Carboniferous, Permian, Triassic, and Jurassic age in the east of the Junggar Basin. This geochemical study has shown that Permian source rocks, which contain high abundance of organic matter with good genetic potential, are the best hydrocarbon source rocks in this area. Triassic source rocks are shown to be next best in these aspects. The abundance of mainly type I organic matter in Jurassic and Carboniferous source rocks varies greatly, and their genetic potential is lower than that of Permian and Triassic rocks. These four source rock units in the Fukang sag all reach a mature to high mature stage and have generated large amounts of oil. Using carbon isotopic and biomarker data, the crude oils in this area can be divided into five groups. The first group of crude oils is derived from the Permian, the second group from the Triassic, and the third group from the Jurassic source rocks. The geochemical properties of the fourth group of oils are intermediate between the properties of typical Permian, Triassic and Jurassic oils. The fifth group of crude oils is particularly isotopically heavy, and originate from Carboniferous source rocks. The crude oils in the Cainan field belong to the fourth group of oil, and are of a special type in that they have little correlation with any of the four known source rocks in the basin. Based on their distribution in the reservoir formations, and their carbon isotopic and biomarker compositions, it is concluded that these crude oils are mixtures of hydrocarbons from Permian, Triassic and Jurassic source rocks. A mixing calculation using whole-oil stable carbon isotope ratios of typical end-member crude oils suggests that the contribution of Jurassic source rocks to the Cainan crude oils averages around 60%. A second calculation based on absolute concentrations of biomarkers indicates that the Jurassic contribution averages 62%, while those of the Triassic and Permian source rocks average 15% and 23%, respectively. Artificial

关 键 词：地球化学 混合原油 油源对比 准噶尔盆地 

分 类 号：TE122.113[石油与天然气工程—油气勘探]