塔河油田奥陶系碳酸盐岩油藏地质储量计算方法
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摘要
塔河油田奥陶系油藏是中国目前发现的最大规模的碳酸盐岩缝洞型油藏,储层非均质性强,油藏建模难度大,储量参数取值不确定因素多。塔河油田在勘探和开发初期阶段,主要采用静态容积法计算地质储量,储量计算结果与后期油田开发认识有偏差。根据油田勘探开发不同阶段,对比分析静态容积法、改进的容积法、动态法、概率法、缝洞单元法等储量计算方法及适用性,初步提出了按照溶洞型、孔洞型、裂缝型划分储层类型,综合地震属性确定不同类型储层的振幅变化率门槛值,进而确定含油面积,其储量计算结果与目前开发认识趋于一致。
Ordovician oil reservoir of Tahe oilfi eld is the largest fractured carbonate rock reservoir ever found in China. The reservoir is strongly heterogeneous and diffi cult for building reservoir model. The parameters are also uncertain for estimation of reserve. Tahe oilfi eld adopted the static volumetric method to calculate geological reserve in the initial exploration and development stage. The result from calculation of reserve is not in line with the conclusion drawn from later development stage of the oilfi eld. In the light of different exploration and development stages, this paper compares and analyzes a series of calculation methods, such as static volumetric method, improved volumetric method, dynamic method, probability method, and fracture-cavern unit method and their adaptabilities. It is pointed out that types of reservoirs should be divided according to soluble cave type, porous type and fracture type. Area, one of the parameters, is determined through limit value set by seismic amplitude variation, thus determining the oil-bearing area. The result is line with the conclusion drawn from the current development.
引文
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