乌夏地区侏罗系稠油性质与稠变机理探讨  

PROPERTIES AND STUDY ON THE ALTERATION OF HEAVY OIL OF JURASSIC IN WU-XIA AREA,JUNGGAR BASIN

作　　者：谢正霞[1] 王伟锋[1] 陈刚强 辛也[1] 吴敏[1] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]中国石油新疆勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆地质》2009年第1期53-57,共5页Xinjiang Geology

摘　　要：准噶尔盆地乌夏地区稠油油藏主要分布在乌夏断裂带附近及上盘构造高部位.通过对稠油物理及地球化学性质分析,发现该区稠油具高密度、高粘度、高酸值、低蜡、低硫特点,正构烷烃损失严重,胡萝卜烷缺失,藿烷、甾烷和重排甾烷等都有不同程度损失,三环萜烷、妊甾烷和高妊甾烷含量高,非烃+沥青质含量低.结合正常原油、稠油和油砂在平面和剖面上分布特征,认为乌夏地区稠油是次生成因.次生蚀变作用主要包括生物降解作用、氧化作用、水洗作用和扩散作用等,其中以生物降解作用和氧化作用为主.建立了稠油成藏模式,为预测该区稠油油藏分布提供了理论依据.The heavy oil reservoir mainly distributes near the Wu-Xia fault belt or on the structural high part which lies in the top wall of the fault in Wu-Xia Area of Junggar Basin. By analyzing its physical and geochemical properties, we find some characteristics of the heavy oil. Such as： the density ,viscosity and acid value of heavy oil are very hight;The wax and sulphur content are relatively low, partial hopanes,stcrancs and homosteranes,and n-alkanes,free carotene suffer serious loss; While tricyclic terpanes, pregnanes and homopregnanes are in high content. Based on these characteristics as well as the distribution of normal crude oil, heavy oil and oil sand, it is considered that the heavy oil in this region is mainly of secondary origin. Additionally,the alteration of heavy oil would be divided into biodegradation,oxygenation,water washing and diffusion respectively,of which the biodegradation and oxygenation are the most important. Finally, the accumulation model of heavy oil is established, which provides theoretical basis in predicting the distribution of heavy oil in the Wu-Xia area.

关 键 词：稠油 物理性质 地球化学性质 次生成因 

分 类 号：P618.13[天文地球—矿床学]