东营凹陷南坡东段不同含硫量原油特征及高硫原油成因分析  

Characteristics of crude oil with different sulfur content and genesis analysis of high-sulfur crude oil in eastern section of southern slope of Dongying Sag

作　　者：牛子铖 王永诗[3] 王学军[1] 孟伟 刘旋[1] 王茹 王娟 刘会平 NIU Zicheng;WANG Yongshi;WANG Xuejun;MENG Wei;LIU Xuan;WANG Ru;WANG Juan;LIU Huiping(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Postdoctoral Work Station of Shengli Oilfield,SINOPEC,Dongying City,Shandong Province,257001,China;Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]中国石化胜利石油管理局有限公司博士后科研工作站,山东东营257001 [3]中国石化胜利油田分公司,山东东营257001

出　　处：《油气地质与采收率》2022年第5期15-27,共13页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“渤海湾盆地剩余油气资源潜力研究”(2016ZX05006001);山东省自然科学基金项目“断陷湖盆咸化环境烃源岩有机酸生成模式及其主控因素研究—以济阳坳陷为例”(ZR2021QD129)。

摘　　要：东营凹陷南部斜坡带(南坡)东段原油含硫量分布具有明显的规律性,平面上原油含硫量从洼陷中心向边缘逐渐降低,垂向上含硫量较高的原油主要发育在中浅层。研究区发育典型的陆相高硫原油,整体呈高密度和高黏度的特征,非烃和沥青质在族组分中占比较高,族组分碳同位素相对较重。原油地球化学特征揭示高硫原油来源于盐度较高、还原性强的沉积水体下发育的烃源岩。不同地区高硫原油生物标志物的差异反映了成因主控因素的不同,以乐安油田为代表的高硫原油埋深浅、成熟度高、水体盐度较高、生物降解程度高,而以王家岗油田为代表的高硫原油埋深较大、成熟度较低、水体盐度更高、生物降解程度低。前者的成因是生物降解作用过程中硫元素的相对富集,原油降解后的再次充注导致含硫量降低,而后者是还原水体中形成的富硫生油母质早期生烃的结果,硫酸盐热化学还原反应可能在局部地区发挥部分作用。因此,在陆相盆地中,强还原环境下形成的富硫生油母质是高硫原油形成的基础,生物降解、硫酸盐热化学还原等次生作用是原油含硫量进一步升高的重要因素。The sulfur content of crude oil in the eastern section of the southern slope belt(south slope)of Dongying Sag is regularly distributed:The sulfur content of crude oil gradually decreases from the center of the subsag to the edge in the pla⁃nar direction,whereas high-sulfur crude oil is mainly developed in the middle-shallow formations in the vertical direction.Typical continental high-sulfur crude oil is developed in the study area,with high density and high viscosity on the whole,high proportions of non-hydrocarbons and asphaltenes in group components,and heavier carbon isotopes in group compo⁃nents.The geochemical characteristics of crude oil reveal that high-sulfur crude oil originates from source rocks developed under sedimentary water bodies with high salinity and great reducibility.Differences in biomarkers of high-sulfur crude oil in different regions reflect different main genesis of the crude oil.The high-sulfur crude oil represented by that in Le’an Oilfield has small burial depth,high maturity,high water body salinity,and high degree of biodegradation,while the high-sulfur crude oil represented by that in Wangjiagang Oilfield is characterized by large burial depth,low maturity,higher wa⁃ter body salinity,and low degree of biodegradation.The main genesis of the former type of high-sulfur crude oil is that the relative enrichment of sulfur during biodegradation and refilling after crude oil degradation lead to reduced sulfur content.In contrast,the latter type is the result of hydrocarbon generation at an early stage from high-sulfur hydrocarbon-generating parent materials deposited in a reducing water body.Thermochemical sulfate reduction(TSR)reaction may have played a role locally.Thus,in a continental basin,the high-sulfur hydrocarbon-generating parent materials formed in a highly reduc⁃ing environment are the basis for the formation of high-sulfur crude oil,and secondary actions such as biodegradation and TSR are important factors for the further increase in the sulfur content of crude oil.

关 键 词：含硫量 饱和烃 芳香烃 低熟稠油 生物降解 东营凹陷 

分 类 号：TE122.113[石油与天然气工程—油气勘探]