复杂碳酸盐岩储层含油气饱和度计算方法探索

文章根据油、气、水在孔、洞、缝非均质储层中的赋存状态和不同测井方法的探测特性，建立了储层的原始地层流体模型、钻井液侵入模型和测井响应的数理模型，从而研制了相应的流体饱和度计算方法及储层含流体性质判别方法。将以上模型及判别方法应用于空隙空间结构极其复杂的裂缝-溶洞型储层，分别计算出了束缚水饱和度、自由水饱和度、封存水饱和度、自由烃饱和度和不可动烃饱和度，从而在油、水分布关系十分复杂的井剖面中不仅能较准确地判别出地层流体性质，而且可以解释和预测油、水的产出特征。

CALCULATION METHODS OF THE OIL AND GAS SATURATION IN COMPLEX CARBONATE RESERVOIR

According to the occurrence conditions of oil, gas and water in the heterogeneous reservoir with pores, cavities and fractures and to the response characteristics of different logging methods, the original reservoir fluid model, drilling fluid invasion model and log response mathematical model were set up, thus developing the calculation methods of relevant fluid saturations and the identification methods of reservoir fluid nature. By applying these models and identification methods mentioned above, the irreducible water saturation, free water saturation, pent-up water saturation, free hydrocarbon saturation and immovable hydrocarbon saturation of the fracture-cavity reservoir with very complicated pore space structure were calculated respectively, then not only can the reservoir fluid nature be accurately identified but also the producing characteristics of the oil, gas and water may be interpreted and predicted on the drilling profile with very complicated oil-gas-water distribution relationship.