塔河油田奥陶系缝洞型油藏储量计算方法

Reserve calculation for Ordovician fracture-cavity reservoirs in Tahe Oilfield

塔河油田奥陶系碳酸盐岩油藏属古岩溶缝洞型油藏,储层发育受控因素多,非均质性强,储集空间多样,储集类型复杂,既有裂缝-溶蚀孔隙型储层,也有裂缝-溶洞型储层,堪称世界上最复杂特殊的碳酸盐岩油藏,油藏描述难度大,常规的储量计算方法不能有效使用。在分析塔河油田缝洞型储层连续性特征尺度的基础上,提出了采用孔隙体积来表征缝洞型碳酸盐岩油藏的储集性及相应的储量计算方法,采用多元回归分析方法和数值模拟方法,计算了典型区块的缝洞型碳酸盐岩油藏储量,对塔河油田奥陶系油藏精细描述和后期开发方案调整具有重要意义。

Ordovician carbonate reservoirs in Tahe Oilfield belong to palaeokarst fracture-cavity type.Reservoir development was controlled by multifactor,the reservoirs are heavily heterogeneous,reservoir spaces are various and complicated,including both fracture-dissolved pore type and fracture-cavity type.Here can be rated as the most special and complicated carbonate reservoir in the world.The reservoir is difficult to describe and conventional reserve calculation method is ineffective.Based on the analysis of reservoir continuity in Tahe Oilfield,it is proposed to characterize fracture-cavity carbonate reservoir and calculate reserves by using pore volume.Multiple regression analysis method and numerical simulation are used to calculate the reserves of typical reservoirs.This is of significant meaning to fine reservoir description and late stage development adjustment in Ordovician reservoir in Tahe Oilfiel.