阿曼盆地侯格夫群地层演化及其对油气的控制

Stratigraphic Evolution of Huqf Group and Its Control on Hydrocarbon Accumulation in Oman Basin

以IHS2009数据为基础,结合前人研究成果,对阿曼盆地前寒武纪—早寒武世侯格群地层特征进行详细分析。研究表明:侯格夫群地层是盆地由早期裂谷向坳陷型盆地发育过程中的产物,总体上是处于浅海、间歇性海以及潮间带—潮上带沉积环境。侯格夫群地层是盆地重要的含油气层系,包括纳封组胡费段白云岩和阿拉组蒸发岩等重要的烃源岩层,以及纳封组巴赫段白云岩和阿拉组生物岩等主要的储集层系。分析认为,阿曼盆地侯格夫群油气聚集与分布受构造演化与沉积相分布控制,断裂和阿拉组底部区域不整合是油气主要运移通道。

Based on the data of IHS2009, combining the results of previous studies, the stratigraphic features of Huqf Group from Precambrian to Early Cambrian in Oman Basin is analyzed in detail. The study shows that the strata of Huqf Group are the products of basin development from early rift to depression. Sedimentary environment which includes shallow sea, intermittent sea and intertidal-supralittoral zone is developed during this period. It is an important oil and gas stratum in this basin. The dolostone of Khufai member in Nafun Formation and evaporive of Ara Formation are important hydrocarbon source rocks. The dolostone of Buah member and biological rock of Ara Formations are the main reservoir. Obviously, oil and gas accumulation and distribution of Hnqf Group in Oman Basin are controlled by structure evolution and sedimentary facies distribution. The main migration path of oil and gas is fracture and regional unconformity of the bottom of Ara Formation.