海上低渗气藏流体饱和度场建立新方法

A new method for establishing fluid saturation distribution in offshore lowpermeability gas reservoirs

针对海上非均质性低渗气藏井数较少,气水空间分布难以准确预测的问题,以N气田为例,通过储层分类,对不同类型储层的微观孔隙结构特征进行分析,并在此基础上利用J函数约束建立流体饱和度场。研究结果表明,利用该方法预测的流体饱和度同探井井上测井解释结果吻合性较好,表明该方法能够较准确地表征非均质性低渗气藏的气水空间分布状况,为海上低渗气田开发方案的制定、确保气田的高效开发提供重要依据。

In order to solve the problem that the number of wells in offshore heterogeneous low-permeability gas reservoirs is small,and the spatial distribution of gas and water is difficult to accurately predict,taking the N gasfield as an example,the microscopic pore structure characteristics of different types of reservoirs were analyzed through reservoir classification,and on this basis,the fluid saturation field was established by using the constraint of the J function.The results show that the fluid saturation predicted by this method is in good agreement with the interpretation results of exploration wells logging,indicating that this method can more accurately characterize the spatial distribution of gas and water in heterogeneous low-permeability gas reservoirs,and provide an important basis for the formulation of offshore low-permeability gas reservoir development plans and ensure the efficient development of gas fields.