摘要
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C28-28，30-二降藿烷、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、Ⅱ，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。
The sulfur-rich heavy oil in Luojia-Kenxi area of Jiyang Depression can be classified as two kinds of sulfur-rich heavy oil and extra-heavy oil, according to their physical properties. The sulfur-rich heavy oil has the intact series of normal and isomeric alkanes, and the stereo-isomerization parameters of C29 sterane are from 0.41 to 0.54, which are higher than those of general low-mature oil. The sulfur-rich heavy oil has the common characteristics of the low-mature oil in the salt lake depositional environment and contains high-abundance C21 and C22 pregnane, rare C2s-28, 30-bisnorhopane, a series of methylhopane, hopane sulfide and sulfide seranes of C16 and C22. The normal and isomeric alkanes of the sulfur-rich extra-heavy oil were lost in some extent, but the characteristics of steranes, terpanes and most of aromatic hydrocarbons are similar to those of the primary heavy oil. The oil-to-source correlation and quantification of soluble organic matter from source rocks showed that the sulfur-rich heavy oil was mainly derived from the very good source rocks with the type-Ⅰ and type- Ⅱ1 kerogens in the hypersaline depositional environment of the Es4 upper member of Shahejie Formation in Bonan Sag. The peak values of vitrinite reflectance for oil generation of good source rocks range from 0.55% to 0.60%. In the peak stage of vitrinite reflectance, the total soluble organic matter occupies 85% of the total organic matter in the source rocks. The sulfur-rich heavy oil was mainly generated from the soluble organic matter and showed the low-mature oil, which was not derived from the later thermal degradation of kerogen.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2007年第6期52-58,65,共8页
Acta Petrolei Sinica
基金
中国石油化工股份有限公司重点科技攻关项目(200198)"胜利油区未熟-低熟油成烃机理
判识标志
成藏条件及资源预测"部分成果
关键词
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
Jiyang Depression
salt lake depositional environment
sulfur-rich heavy oil
normal alkane
isomeric alkane
hydrocarbon source rock
soluble organic matter
low-mature oil
