井-地电位法成像技术在长庆油田区域评价中的应用

井-地电位技术作为新型电法勘探方法,具有不破坏地层、测量成本低等优点。孔隙流体性质改变引起电阻率变化,进而引起地面电位测量值的改变,是井-地电位解释的基础。阐述了井-地电位的测井原理,重点研究了井-地电位的正演和反演模型,建立一套适合长庆油田区域评价的解释模型。通过实例介绍井-地电位数据在剩余油评价、水驱前缘、裂缝分布等方面的应用,与实际动态数据和其他资料解释结果对比,证实该方法的可靠性。

Application of Well-ground Potential Image in Regional Evaluation of Changqing Oilfield

A new electrical survey,well-ground potential imaging technique is getting more and more attention in regional evaluation because of its advantages-no damage to reservoir and low cost.Pore fluid properties change resistivity and surface potential measurements.This is the basis of well-ground potential interpretation This paper introduces the logging principle and forward and inversion models of well-ground potential imaging,and based on which interpretation models are established for regional evaluation of Changqing oilfield.Case study shows the application of well-ground potential data in residual oil evaluation,water flooding front,fracture distribution and other aspects.The reliability of this method is verified by actual dynamic data and other log interpretation results.