苏德尔特油田布达特潜山风化特征及储层分类

The Weathering Characteristics of Budate Buried Hills and Reservoir Classification of Sudheer Oilfield

苏德尔特油田布达特潜山油藏属于盆地基岩浅变质裂缝油藏。针对单井产量差异大,油层发育,油气富集规律认识不清及地下储层发育状况不明等诸多问题,根据岩心观察、野外露头等资料对潜山风化特征进行分析,划分出全风化黏土带、强风化倒石堆、中等风化淋蚀带、弱风化裂隙带及未风化原岩带等5个区带,其中中等风化淋蚀带是储层最有利的发育带。结合钻井取心、电测曲线特征、风化带的位置以及试油、试采等资料,将储层细分为3类,其中Ⅰ类储层多位于中等风化淋蚀带且产能较高。

Budate buried hill reservoir in Sudheer Oilfield belonged to a shallow metamorphic fractured reservoir in the basin basement.However,there were still many problems,such as wide variation in single well production rate,the unclarified understanding of development regularity,enrichment regularity of oil reservoir and unclear underground reservoir condition.According to the observation of core and outcrops,the buried hill weathering characteristics were analyzed,it was classifiedinto 5areas such as a fully weathered clay belt,strong weathering talus,moderately weathered and rain erosion zone,weakly weathered fracture zone and raw rock zone.Among these,the moderately weathered zone was the best development position of reservoirs.In combination with drilling coring,electric logging data,the position of weathering and data of well testing and oil productiion testing,the reservoir is classified into 3categories,of which the reservoir of Grade I is located in the moderately weathered and rain erosion zone and it is high productivity.