利用研究区最新的地震和钻井等基础资料,对东非鲁伍马盆地已发现气藏的成藏条件及成藏控制因素进行了分析研究.结果表明,鲁伍马盆地具有良好的油气成藏条件,研究区内烃源岩为裂谷期发育的二叠系—三叠系、侏罗系和白垩系的泥页岩,储层为古近系浊积砂岩,盖层为古近系发育的几套分布广泛的海相泥岩.分析认为构造活动控制了研究区的油气成藏,良好的盖层条件是油气成藏和保存的关键因素.指出构造相对稳定区,特别是受晚期伸展构造影响较弱的陆坡区是优先勘探的方向,区块优选应尽量避开通天断裂发育的区域,同时需要重点对区域盖层条件进行评价.

Based on the latest seismic and drilling data, the formation conditions of gas reservoir and the controlling factors of gas accumulation of the Rovuma Basin in East Africa have been analyzed. The results show that the Rovuma Basin has excellent conditions for hydrocarbon accumulation. In the study area, the source rock is mud shale of Permian-Triassic, Jurassic and Cretaceous which developed in the rift period, and the reservoir is the Paleogene turbidite sand, and the regional caprock has several sets of the marine mudstone widely distributed in Paleogene. It is concluded that the tectonic activities controlled the oil and gas accumulation in this area, and good caprock conditions are the key factor for hydrocarbon accumulation and preservation. It is pointed out that the relatively stable area, especially the continental slope area with weak tectonic deformation during the latest extensional deformation is a priority exploration region, and the optimal selection of exploration block should avoid the area with large scale faults that extend to sea floor, and the regional caprock conditions should be evaluated emphatically.