东非裂谷东支South Lokichar盆地油气成藏规律

HYDROCARBON ACCUMULATION IN SOUTH LOKICHAR BASIN,EASTERN BRANCH OF EAST AFRICAN RIFT SYSTEM

东非裂谷东支由多个盆地组成,勘探程度低,目前仅South Lokichar盆地有油气发现。通过以钻井、地震及分析化验资料为基础,对South Lokichar盆地的油气地质条件及成藏规律进行详细分析认为:South Lokichar盆地成藏条件优越;油气发现集中于Lower Auwerwer组和Lokhone Shale组,Lower Auwerwer组为主要目的层;西部陡坡带为主要油气聚集带,储层是影响成藏及油层厚度的主控因素;东部缓坡带目前储量很小,主要目的层未成藏,侧封条件差是影响其成藏的主控因素。

The eastern branch of the East African Rift System is composed of several basins. It re- mains low in hydrocarbon exploration degree and only in the South Lokichar basin there are oil discov- eries. The paper is to analyze the geological conditions for hydrocarbon accumulation in the South Lo- kichar basin with drilling, seismic and laboratory data. The study shows that the South Lokichar Ba- sin has favorable conditions for oil and gas accumulation. Both of the Lower Auwerwer Formation and the Lokhone Shale Formation have oil accumulations being found and the former is the main explora- tion target. The western steep slope zone is the main hydrocarbon accumulation zone, in which both of the exploration targets have oil discoveries. Reservoir is the main factor affecting oil and gas accu- mulation and net pay thickness. The eastern gentle zone has little discovery until now, in which the main exploration target, the Lower Auwerwer Formation, has nothing discovered yet and poor lateral sealing is proposed as the main factor.