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Genesis and characteristics of sulfur-rich heavy oil in salt lake depositional environment of Jiyang Depression
Author(s): 
Pages: 52-58,65
Year: Issue:  6
Journal: ACTA PETROLEI SINICA

Keyword:  济阳坳陷盐湖沉积环境高硫稠油正构烷烃异构烷烃烃源岩可溶有机质低熟油;
Abstract: 依据物理性质可将济阳坳陷罗家-垦西地区高硫稠油分为高硫稠油和特稠油,高硫稠油有完整的正、异构烷烃分布,C29甾烷立体异构化参数为0.41~0.54,高于一般低熟油.但仍具有盐湖环境低熟油常见的生物标志物特征,并含有异常丰富的C21、C22孕甾烷、罕见的G28-28,30-二降藿烷、甲基藿烷系列、含硫藿烷及硫在C16、C22位的含硫甾烷.高硫特稠油的正、异构烷烃有不同程度损失,甾、萜类及绝大部分芳烃类化合物特征与稠油相同.油源对比及烃源岩可溶有机质的定量测定表明,高硫稠油主要来源于渤南洼陷沙四上亚段膏盐沉积环境Ⅰ、Ⅱ1型干酪根优质烃源岩,其生油高峰的R.为0.55%~0.60%.达生油高峰时可溶有机质占烃源岩总有机质的85%,因此高硫稠油主要来自可溶有机质,属于非干酪根晚期热降解成因的低熟油.
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