东非Lake Albert盆地构造调节带特征及其对油气成藏的控制作用

Geological Character of Accommodation Zone and Its Importance in Controlling Accumulation of Oil and Gas in Lake Albert Basin

构造调节带是裂谷盆地中的一类重要构造形变,而东非裂谷带是研究这一构造现象的理想区域。以东非Lake Albert盆地为研究对象,在对盆地构造、沉积及油气成藏精细研究的基础上,对该区构造调节带的特征及其对油气成藏的控制作用进行了深入分析。研究表明,Lake Albert盆地构造调节带作为张性应变调节构造系,圈闭相对发育,以断块圈闭为主;同时因其在古地貌上一般表现为斜坡,对砂体注入有强烈的控制作用,在Lake Albert盆地构造调节带附近发育优质的三角洲砂体;加之其侧翼往往与油气潜在生成场所相接,因此构造调节带对油气成藏具有明显的控制作用。

Accommodation zone is an important structural deformation in rift basins, and the eastern part of Africa is the most desirable area of study. The geological character of accommodation zone in the Lake Al- bert Basin and its importance in controlling hydrocarbon accumulation has been deeply analyzed based on regional tectonic, sedimentary and reservoir formation studies. As for accommodation structural system in the extension area, traps （mainly faulted block traps） are more developed. Larger drainage systems are a- ble to enter and provide a large input of clastic material into rift basins along the relay ramp, which is a kind of accommodation zone. In addition to this, accommodation zones often connect with hydrocarbon generation kitchens. All this demonstrates that accommodation zones have very strong controlling effects on hydrocarbon accumulation in rift basins.