埃塞俄比亚欧加登盆地油气勘探潜力

Hydrocarbon Exploration Potentiality of Ogaden Basin in Ethiopia

埃塞俄比亚欧加登盆地晚二叠世—早白垩纪发育海相、陆相两种类型多套烃源岩,其中Bokh组湖相烃源岩规模大,演化程度高,是盆地的主力烃源岩,奠定了盆地形成大油气田的资源基础,目前已发现的油气大部分都来自Bokh组。盆地划分为七个一级构造单元,中部坳陷可划分为七个二级构造单元,发育多套生、储、盖组合,圈闭形成较早,各成藏要素在时间上匹配较好,具备良好的油气成藏条件。空间上,位于西部凹陷和中部凹陷之间的中央凸起成藏条件最好,勘探程度最高,是最现实的勘探区域,紧邻西部凹陷的西部斜坡带在勘探接替区中圈闭资源量最大,最有望实现工业性突破。

Multiple sets of source rocks of marine and continental facies were developed from the late permian to early cretaceous in the Ogaden basin of Ethiopia,among which the lacustrine source rocks of Bokh formation have large scale and high evolution degree feature,and are main source rocks in the basin,lay the resource foundation for the large oil and gas fields in the basin.Hydrocarbon found is mainly from Bokh formation.The basin is divided into seven first-order tectonic units,and the central depression can be divided into seven second-order tectonic units.Multiple sets of generation,reservoir and cap combinations are developed,and traps formed early.Spatially,reservoir forming condition of central high between western sag and central sag is the best,with highest exploration degree,which is the most realistic exploration area.Western slope zone adjacent to western sag has the largest amount of resources in the exploration bench area and is most likely to achieve industrial breakthrough.