利用J函数拟合法建立海上油田饱和度模型

The Establishment of Offshore Oilfield Three-Dimensional Water Saturation Model by J Function Direct Fitting Method

油气藏的含油气饱和度分布受储层性质、构造位置及压力系统等多种因素的影响,还与岩石的微观结构有关。井点较少、资料有限的海上油气田,给定平均值或采用井点插值建立的饱和度模型很难真实反映流体分布情况。J函数直接拟合法可以综合应用从同一油藏中取得的多块岩心的毛管压力数据,进而消除油藏中各点的渗透率、孔隙度等非均质性对毛管压力曲线的影响。基于孔隙度模型,利用J函数计算的饱和度趋势体进行约束,进行多次随机模拟,优选出的饱和度模型能够直观准确地反映地下流体含水饱和度的三维分布,为油田进一步调整勘探开发方案提供有力的依据。

The distribution of oil and gas saturation of oil and gas reservoir is influenced by many factors,suchas reservoir properties,tectonic location and pressure system,etc.,it is also related to the microstructure of rock.With the less well points and limited data in offshore oil and gas fields,the water saturation modeled by given theaverage value or using well point interpolation simulation cannot truly reflect the distribution of undergroundfluid.The J function directly fitting method have an advantage that capillary pressure data can be obtained fromthe comprehensive application of multi cores in the same reservoir,and eliminate the influence of each point inthe reservoir permeability and porosity heterogeneity on capillary pressure curve.Based on porosity model,watersaturation preferred model is constrained by the trend body which calculated of J function,and multiply stochasticsimulation,finally carries on the uncertainty analysis optimization,can directly and accurately reflect the threedimensionaldistribution of fluid saturation underground of less well points in offshore oil and gas fields,adjusted toprovide a strong basis for the further development of oilfield later.