东营凹陷北部原油有机地化特征与成因类型  

Organic Geochemistry and Origin Types of Crude Oils from the Northern Area of the Dongyin Depression

作　　者：鹿洪友[1] 肖贤明[1] 刘中云[1] 高喜龙[1] 郭汝泰[1] 王建宝[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州510640

出　　处：《沉积学报》2003年第4期707-712,共6页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目 (批准号 :40 0 72 0 4 3)资助

摘　　要：东营凹陷北部油气藏分布范围广 ,储集层位多。应用有机地球化学方法 ,通过对典型原油样品有机地球化学特征及原油饱和烃单体烃碳同位素特征的研究。结果表明 ,该区原油可大致划分为三种类型。类型Ⅰ :Pr/Ph介于1.0～ 1.3;Pr/nC17介于 0 .4 0～ 0 .80 ;Pr/nC18介于 0 .4 0～ 0 .6 0 ,伽玛蜡烷指标 <0 .10 ,Ts/Tm介于 0 .80～ 1.30 ,单体化合物碳同位素较重 ;类型Ⅲ :Pr/Ph介于 0 .80～ 0 .30 ;Pr/nC17介于 1.0～ 0 .6 0 ;Pr/nC18介于 2 .0～ 1.0 ;伽玛蜡烷指标 >0 .4 0 ;Ts/Tm介于 0 .4 0～ 0 .70 ;单体化合物碳同位素分布较轻。类型Ⅱ原油上述指标介于类型Ⅰ与类型Ⅲ之间。这三类原油的地质分布也具有一定特点。第Ⅲ类原油分布最广 ,在利津—民丰生油洼陷周围均有分布 ,类型Ⅱ与类型Ⅰ原油主要分布在民丰洼陷周围。Petroleum pools occur widely with a few sets of reservoirs in the Northern Area of Dongyin Depression. Organic geochemical methods and carbon isotopic analysis of single compounds have been applied to investigate the typical crude oils from this area. The results show that there are three origin types of crude oils which can be identified mainly by the five geochemical parameters: Pr/Ph, Pr/ n C 17 , Ph/ n C 18 , Gammacerane/ C 30 hopane , Ts/Tm and carbon isotopic value of single compounds. The five parameters for Type Ⅰ are 1.0～1.3, 0.40～ 0.80 , <0.10 and 0.80～1.30, respectively, with a heavier carbon isotopic value of single compounds. The five parameters for Type Ⅲ are 0.8-0.3, 1.0～0.6, 2.0～1.0, >0.40, 0.4～0.70 , respectively , with a lighter carbon isotopic value of single compounds. The above geochemical parameters of Type Ⅱ crude oils are between type Ⅰ and Type Ⅲ. The geological distribution of the three types of crude oils areas as follows: Type Ⅲ occurs widely, around the Lijing Depression and the Minfeng Depression, but types Ⅰ and Ⅱ occur locally, mainly around the Lijing Depression. The results are greatly significant to understand the origin of petroleum pools and the definition of petroleum system for this area.

关 键 词：东营凹陷 原油成因类型 生物标志物 单体烃碳同位素 油气藏 

分 类 号：P618.130.2[天文地球—矿床学]