高青—平方王潜山带原油地化特征及油源分析

Geochemical characteristics of crude oil and oil source analysis of Gaoqing-Pingfangwang buried hill belt

王志杰

Wang Zhijie

中国石化胜利油田分公司纯梁采油厂，山东 博兴 256504

Chunliang Oil Production Plant, Shengli Oilfield Company, SINOPEC, Boxing 256504, China

高青—平方王潜山带是东营凹陷盆缘潜山中勘探潜力最大的区带，研究区内油藏类型、油气来源比较复杂。文中运用原油地球化学特征的分析结果，对油气成因类型及油源进行了系统判识。研究表明，该区主要存在3类原油：Ⅰ型原油具有低Pr/Ph、高γ鄄蜡烷特点，与沙四上亚段烃源岩特征相近；Ⅱ型原油具有高Pr/Ph、低γ鄄蜡烷特点，表明原油与沙三下亚段烃源岩特征一致；Ⅲ型原油表现出2种原油的混源特征。通过精细的油源对比，对研究区油气来源进一步划分，分析认为：平方王、平南和小营油田油气主要来自于沙三下亚段烃源岩；高青油田油气来源比较复杂，其中第三系油气主要来自沙三下亚段烃源岩，中生界油气主要来自沙四段烃源岩，局部具有混源的特征。

Gaoqing-Pingfangwang buried hill belt is the most favorable buried hill belt in Dongying Depression. The reservoir type and the oil source are very complex in the study area. Based on the geochemical characteristics analyses of crude oil, the origins of the oils found in the study area are classified into three classes. ClassⅠoil is characterized by low ratio of Pr/Ph and high content of gammacerane, which shows that the oil may come from the upper section of the 4th member of Shahejie Formation. Class Ⅱ oil has a high ratio of Pr/Ph and low content of gammacerane, which shows that the oil may come from the lower section of the 3rd member of Shahejie Formation. Class Ⅲ oil has the mixed characteristics of ClassⅠand ClassⅡ. It is found out that the oils of Pingfangwang, Pingnan and Xiaoying Oilfields mainly source from the lower section of the 3rd member of Shahejie Formation. The oil sources of Gaoqing Oilfield are complex, in which the oils of Tertiary reservoir mainly come from the lower section of the 3rd member of Shahejie Formation and the oils of Mesozoic reservoir mainly source from the upper section of the 4th member of Shahejie Formation, locally having the mixed oil source characteristics.

10.6056/dkyqt201203004