PNST脉冲中子全谱测井仪在高尚堡油田浅南区的应用

Application of PNST in Shallow South Area of Gaoshangpu Oilfield

高尚堡油田浅南区低阻油气层发育、老井水淹情况复杂,认识难度大。为制订老井挖潜增产方案,采用PNST测井了解各小层含油性。PNST测井仪能实现双源距碳氧比、中子寿命、脉冲中子-中子、能谱水流功能。利用碳氧比曲线可计算地层含油饱和度,分析储层水淹程度,确定措施层段。措施前后生产情况对比表明,PNST测井碳氧比模式在中高孔隙度、中高渗透率地区能够准确区分油水层,判断油层水淹程度;综合利用非弹、俘获伽马计数率测井信息能够准确识别气层,区分气水层,提高解释精度。生产应用实例表明,PNST脉冲中子全谱测井仪适用于高尚堡油田浅南区,测井结果为油田制订开发措施提供了有效依据。

Because of difficult identifying and complex situation of oil and gas layer saturation and water flooding in the shallow south area of Gaoshangpu oilfield with low resistivity oil and gas reservoir,PNST（ Pulse Neutron Spectrum Tool） was used to understand the oil saturation of each small layer to formulate plan to tap the remaining oil and increase the production. PNST has the function of achieving the dual spaced carbon oxygen ratio,neutron lifetime,pulse neutron-neutron,spectra flow logging. The carbon oxygen ratio curve can be sued to calculate the oil layer saturation and analyze flooded degree of reservoir and determine the measure sections. Comparison of production before and after the measures shows that PNST logging can accurately identify oil layer and determine the water flooded degree by carbon oxygen ratio model in high porosity and medium-high permeability area. The logging information of inelastic and capturing gamma counting rate can be used to accurately identify gas layer,and distinguish the gas layer from the water layer. According to the above method,the interpretation accuracy is improved. The actual examples in production show that PNST is applicable to shallow south area of Gaoshangpu oilfield.The tool can provide effective basis for working out oilfield development schedule.