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储集层三维地质建模过程中,一般以探井和生产井测井解释饱和度资料为基础,通过随机模拟方法建立饱和度地质模型,但所建饱和度模型大多不能真实反映油气藏原始饱和度分布。特别是对于海上油气田,探井和生产井数少,初期投产生产井数更少,难以建立反映油气藏原始饱和度分布的饱和度模型。以东海西湖凹陷X气田为例,提出一种J函数约束饱和度地质建模方法,该方法使用J函数校正气田中后期不同程度水淹生产井含气饱和度,同时建立含气饱和度建模的约束趋势面,使建立的含气饱和度地质模型更加接近气藏原始含气饱和度分布,为储量复算和油藏数值模拟提供了可靠依据。
In the process of 3D geological modeling of reservoirs, the saturation geology model is generally established based on well logging and well logging interpretation saturation data by stochastic simulation. However, most of the built saturation models can not truly reflect the original saturation of the reservoir distributed. Especially for offshore oil and gas fields, the number of exploration wells and production wells is small, and the number of wells that are put into operation at the initial stage is still relatively small and it is difficult to establish a saturation model that reflects the original saturation distribution of the reservoir. Taking the X gas field in Xihu depression, East China Sea as an example, a geological modeling method of J-function constrained saturation is proposed. This method uses the J-function to correct the gas saturation of different waterflood production wells in the middle and later stages of the gas field and builds the gas saturation model Of the constrained trend surface so that the established gas saturation geologic model is closer to the original gas saturation distribution of gas reservoirs and provides a reliable basis for reservoir recalculation and reservoir numerical simulation.