东营凹陷南斜坡丁家屋子高蜡油油源分析  

Oil Source Correlation of High Waxy Oil in Dingjiawuzi Area in Southern Slop Zone,Dongying Sag

作　　者：刘会平[1] 

机构地区：[1]中国石化股份有限公司胜利油田分公司地质科学研究院,山东东营257015

出　　处：《矿物岩石地球化学通报》2014年第4期505-508,共4页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家科技重大专项资助项目(2011ZX05006)

摘　　要：东营凹陷南斜坡丁家屋子高蜡油发育,在对甾萜类生物标志物、碳同位素和中分子量烃分析的基础上,对研究区高蜡油的来源进行了探讨.该区孔店组原油重排甾烷和4-甲基甾烷含量低,规则甾烷多以C29甾烷为主,C27～C29规则甾烷呈反“L”型分布;三环萜烷含量丰富,伽马蜡烷含量很高,反映了其烃源岩形成于咸化还原的、分层水体沉积环境,这一点与研究区内沙四段烃源岩及相关原油的特征相似.而王古1井奥陶系原油的甾萜类化合物含量低,难以进行准确的油源对比.此外,碳同位素特征和中分子量烃对比结果表明,王古1井奥陶系原油与孔店组原油具有相同的油气来源,且都与沙四段烃源岩及相关原油的特征较为接近,与沙四段烃源岩有着较大的成因关系.The Dingjiawuzi area, which locates in the southern slop of Dongying Sag, was found to enrich of high waxy oil. Based on comprehensive analyses of moderate molecular weight hydrocarbons, carbon isotope and biomarkers such as sterane, terpenoid, the source of high waxy oil was discussed. The oil from the Kongdian Formation is characterized by low content of diasteranes and 4-methyl steranes, C29 regular sterane enrichment and reverse ＂L＂ shape of C27 -C29 sterane distribution, high content of tricyclic terpenoid and gammacerane, reflecting the hydrocarbon source rocks were formed in the briny and deoxidize sedimentary environment. The high content of gammacerane is similar to source rocks and oils related to the Es 4. The oil from the Ordovician Wanggu-1 well has low con- tents of sterane and terpenoid, and such its oil-source correlation is difficult to be accurately estimated. Further- more, carbon isotope and middle molecular weight hydrocarbons results showed that the Ordovician Wanggu-1 well shares the same source of the Kongdian Formation. The characteristics of high waxy oil are closely similar to those of the Es 4 source rocks and oils, therefore, the high waxy oil may come from Es 4 source rocks.

关 键 词：东营凹陷 高蜡油 生物标志物 碳同位素 中分子量烃 

分 类 号：P618.13[天文地球—矿床学]