摘要
苏北盆地管镇次凹陷阜四段烃源岩属低熟烃源岩（Ｒ０≤０．７％）。在重建该套烃源岩埋藏史和地热史并应用其干酪根Ｃ／Ｓ原子比确定其有机质化学动力学类型和相应的化学动力学参数的基础上，对该套烃源岩的生烃史和排烃史进行了模拟。结果表明，阜四段烃源岩分别在始新世中晚期和渐新世早期进入了生烃期和排烃期。综合地质、油源地球化学资料的研究表明，阜四段低熟烃源岩含油气系统为一个未完成的、目前仍处于持续阶段的含油气系统。该含油气系统的原油具有低熟油的特征。阜四段烃源岩的低成熟和低含油饱和度，且进入排烃期后未经进一步的压实作用，导致该套烃源岩的排烃效率较低，进而造成该含油气系统的油源不足。此外，该区主要断层（管镇断裂）对油气运移起隔挡作用，油气二次运移的距离短，因此，该含油气系统受管镇断裂的控制，其区域展布局限在管镇断裂靠油源的东南一侧。
he source rock of the fourth Member of Funing Formation (FMF) in Guanzhen sub-depression of North Jiangsu Basin, is in low maturity (R0≤0.7% ). With the reconstructions of FMF's geological and thermal history, and the determination of organic matter kinetic type by atomic C/S ratio in kerogen, hydrocarbon generation and expulsion modelling for FMF has been carried out using time-temperature index based on the Arrhenius equation. It is indicated that the source rock occurred oil generating and expelling no earlier than mid-late Eocene and early Oligocene, respectively. Combined with data of geological history and organic geochemistry in the interested area, it is suggested that the oil system in FMF is such one that has not been finished and within the stage of persistence, resulting in insufficient, low mature oil accumulation, owing to highly sealing of the faults to oil migration, the FMF oil system is localized in the southeast area against Guanzhen Fault, only within which the FMF can source the reservoirs.
出处
《江汉石油学院学报》
CSCD
北大核心
1996年第3期13-18,共6页
Journal of Jianghan Petroleum Institute
基金
国家"八五"重点科技攻关课题
关键词
油气生成
排烃
低熟烃源岩
含油气系统
oil and gas origin
expelling hydrocarbon
(low mature source rock)
(oil system)
Subei basin
