摘要
本文首先在数值模拟的基础上对库车再生前陆盆地中主要烃源岩的排烃特征进行了研究。结果表明 ,侏罗系湖沼相泥岩和煤岩是盆地主要的气源岩 ,三叠系湖相泥岩是盆地主要的油源岩 ,克依构造带是盆地主要的烃源区。在此基础上进一步结合构造、地层压力和油气分布等资料对盆地的油气运移特征进行了系统地分析和总结 ,认为库车盆地的油气运移通道主要有两种 ,即断层、不整合面和砂体。断层是油气垂向运移的主要通道 ,位于盆地北部的克依构造带 ;不整合面和砂体是油气侧向运移的主要通道 ,主要与盆地南部秋里塔格构造带和塔北隆起上的油气有关。不同类型的源岩具有不同的排烃时间和油气运移时间。运移动力主要为异常孔隙流体压力 ,垂向运移距离在 2～ 5 km之间 ,侧向运移距离较长 ,一般在 2 0～ 4 0 km之上 。
The paper presents firstly the features of the hydrocarbon-expulsion of the major source rocks in the Kuqa rejuvenated foreland basin, northwestern China. The results indicate that while the Triassic mudstone is the main oil source rocks, the Jurassic coal and lake-swamp mudstone are the main gas source rocks. And the Keyi structure belt is the main source area of oil and gas. Moreover, the paper also presents the features of the petroleum migration in Kuqa basin based on the study of the basin structure and gas distribution. There were such two types of petroleum migration routines as faults, unconformities and sandstone in Kuqa basin. The unconformities and sandstone were the main lateral migration routines in which the oil and gas of the Qiulitage structural belt and Northern Tarim Uplift migrated, and the faults were the main vertical migration routines in which the oil and gas of the Keyi structural belt migrated. The migration time of oil and gas came from different source rocks was different distinctively. And the migration power was mainly abnormal pore fluid pressure. Finally, the vertical and lateral migration distances were also different, the former was about 2～5 km, and the latter was above 20～40 km.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2004年第6期848-853,共6页
Acta Geologica Sinica
基金
国家重点自然科学基金 (编号 4983 2 0 40 )资助的成果
