渤海湾盆地南堡凹陷高尚堡地区油源对比及高蜡油成因

渤海湾盆地黄骅坳陷南堡凹陷高尚堡地区高柳断层两侧原油物性和富集层位差异明显。高柳断层以北，原油主要富集于沙河街组三段，普遍具有高蜡特征；高柳断层以南，原油主要富集于明化镇组、馆陶组和东营组，含蜡量相对较低，为正常原油。应用生物标志物和单体烃碳同位素分析不同层系原油来源。沙三段高蜡油来源不同于高柳断层以南正常原油，前者主要来自沙河街组三段四亚段（Es₃⁴）烃源岩，后者主要来自高柳断层以南林雀次洼东营组三段烃源岩。Es₃⁴烃源岩具有高等植物和低等水生生物双重输入的特征，为深层高蜡原油提供了蜡质来源。微生物对有机质的改造、烃源岩较低的热演化程度和沙三段普遍发育异常高压，是高蜡油生成、运移和保存的关键因素。

Correlation of oils and source rocks and genesis of high wax oils in Gaoshangpu area,Nanpu Sag,Bohai Bay Basin

There are significant differences between crude oil properties and enrichment horizon across the Gaoliu Fault in the Gaoshangpu area of the Nanpu Sag.Oils are mainly enriched in the third member of Shahejie Formation(Es3)to the north of the Gaoliu Fault,and are characterized by a high wax content.However,oils are mainly enriched in the Minghuazhen,Guantao and Dongying formations to the south of the Gaoliu Fault,and are normal crude oils with a low wax content.The biomarkers and compound specific isotopes of crude oils from different layers show that the origin of the high wax content oils in the Es3 is different from that of the oils to the south of the Gaoliu Fault.The former is derived from the source rocks of the Es3^4and the latter is sourced from the third member of the Dongying Formation(Ed3)in the Linque Sub-Sag to the south of the Gaoliu Fault.The source rocks of the Es3^4contain abundant terrigenous higher plants and lower hydrobionts,which provide the wax source.The microbe reformation,low thermal evolution degree and abnormal high pressure in the Es3 are key factors in the formation,migration and preservation of high wax oils.