摘要
吉木萨尔凹陷斜坡区存在一个稠油环带,稠油的常规物性具有密度高、粘度高、初馏点高和凝固点降低、含蜡量降低的特点,属于普通稠油。稠油最显著的特点就是成熟度低,γ胡萝卜烷、β胡萝卜烷保存完好,以规则甾烷为主,三环萜烷含量低,藿烷含量变化大。成熟度较低的重质油易成为稠油,地质综合因素控制稠油的分布;在原油稠化的诸多因素中,生物降解是最主要的因素。稠油属于近距离成藏,油源位于凹陷深部。油气有2期成藏,稠油是由第一期成藏的低成熟原油经生物降解稠变而成。
In the thick oil girdle Of the slope area of Jimsar sag, the oil as ordinary heavy oil is characterized as high density, high viscosity, high initial boiling point, low freezing points and low wax content. This heavy oil at low maturity has well preserved β-carotane andcarotane, regular sterane as the main ingredient,low level of triterpene terpane, and the increased content range of hopane. The lowmatured heavy oil is liable to become heavy oil. The integrated geologic factors control the distribution of heavy oil. Biodegradation may be the biggest factor of oil densification. The heavy oil in this sag was accumulated by a shortdistance migration,and the oil source is located at the deep part of this sag. Two times of oil filling happened in the Jimsar sag. The heavy oil was derived from the lowmatured crude oil at the first phase and became the heavy oil by biodegradation.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第1期135-140,共6页
Natural Gas Geoscience
基金
国家重大专项"前陆盆地油气成藏规律
关键技术及目标评价"(编号:2008ZX05003)资助
关键词
稠油环带
低成熟
近源成藏
生物降解
Thick oil girdle
Low mature
Shortdistance migratiom Biodegradation.
