摘要
夏口断层是惠民凹陷划分临南洼陷与临南斜坡的二级断层,具有继承性活动特点。在该断层附近不同位置分布着临南油田和曲堤油田。临南油田位于夏口断层西段的下盘,曲堤油田位于夏口断层东段的上盘。油田这种分布格局与夏口断层的封闭性在横向上的差异性有关,与夏口断层产状也密不可分。断层封闭性西段比东段强,东段成为临南生油洼陷油气向曲堤地区运移的有利通道。断层断面陡的部位是油气运移的优势路径。在断层上盘,断层走向弯曲的向心位置,其油气主要沿断层的凸形断面较陡处通过汇聚流的方式运聚到曲堤油田。油气在穿越断层运移时,会优选较陡断面带向上运移,断面凹凸特征控制着油气在穿越断层面运移时是发散流还是汇聚流。汇聚流的指向区是油气田的分布有利区。
Xiakou fault is a Class-ll fault with succession movement, by which Huimin sag can be divided into Linnan subsag and Linnan slope. Linnan oilfield and Qudi oilfield are distributed in sections near Xialou fault. The former is situated in footwall of west section of the fault, while the latter in upper wall of east section of it. Such a framework is related to the lateral differences of seal of the fault, especially to the fault occurrence. Since the west section has more seal capacity, the east section becomes the favorable pathway for petroleum migration from Linnan subsag toward Qudi area, where the steep part of the fault plays the role of preferred pathway. The steep and convex fault plane controls the petroleum migrating across the plane by the form of spreading or confluence flowing. The direction of confluence flowing is good for petroleum accumulation.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2005年第5期525-528,共4页
Xinjiang Petroleum Geology
基金
国家"十五"科技攻关项目
济阳坳陷下第三系沉积体系与油气运聚机理研究(2001BA605A09)
