摘要
烃源岩在埋藏演化过程中发生排烃的重要表现之一是其生烃潜力不断减小,反之也可利用烃源岩在演化过程中生烃潜力的变化规律来模拟其排烃特征。利用综合热解参数———生烃潜力指数[(S1+S2)/TOC]在热演化过程中的变化规律来确定源岩的排烃门限,并在此基础上模拟计算烃源岩在各演化阶段的排烃率、排烃速率及排烃效率。由于不同类型烃源岩的生烃潜力指数差别很大,在实际应用时应对不同类型源岩,含不同有机质类型的源岩进行区分。将此方法应用于济阳坳陷下第三系,发现油页岩和暗色泥岩具有不同的排烃特征,油页岩的排烃门限比暗色泥岩浅,排烃率也较高。
Hydrocarbon generation potential of source rocks decreases when some hydrocarbon is expulsed. Upon this principle, the process of hydrocarbon expulsion can be simulated. This study utilizes characteristics of variation of hydrocarbon generation potential index [（S1 ＋S2）/TOC3 during burial, to determine expulsive threshold of source rocks. Its expulsive ratio, expulsive rate and expulsive efficiency can also be determined. Because difference of hydrocarbon generation potential index between different types of source rocks is significant, each type of source rock should be simulated respectively. The approach is applied to model the characteristics of hydrocarbon of the Lower Tertiary source rocks in the Jiyang Depression. Resuits show that, characteristics of hydrocarbon expulsion of oil shale is different from that of dark mudstone. Expulsive threshold of oil shale is shallower than that of dark mud, and its expulsive rate is also higher than that of dark mudstone.
出处
《石油实验地质》
CAS
CSCD
北大核心
2006年第1期59-64,共6页
Petroleum Geology & Experiment
基金
国家"十五"科技攻关课题(2001BA60509)
关键词
生烃潜力指数
排烃门限
排烃量
烃源岩
下第三系
济阳坳陷
渤海湾盆地
hydrocarbon potential index
expulsive threshold
Expulsive amount
the Lower Tertiary
the Jiyang Depression
the Bohaiwan Basin
