一种新的石油储层高分辨自然电位测井电极系

A new kind of high-resolution SP logging electrode array for oil reservior

摘要:

针对目前使用的自然电位测井电极系仍采用原始的地面参考电极,存在测量干扰大、测井曲线分辨率低等长期未能解决的问题,设计一种井下参考电极的高分辨自然电位测井电极系,电极系采用阵列式结构,电极之间彼此绝缘,仪器在上提过程中,通过单片机自动识别经过泥岩地层的参考电极,然后以泥岩电位为参考电位进行自然电位测量.现场试验结果令人满意,其抗干扰能力和曲线分辨率均较原有的自然电位测井电极系明显提高.

Abstract:

Aimed at the problems of high interference in measurement and low logging curve resolution for the logging electrode array used at present which still adopts original surface reference electrode,this paper designs a high-resolution SP logging electrode array of downhole reference electrode.The electrode array adopts array structure.It is insulative between the electrodes each other.The tool identifies the reference electrode of shaly formation automatically through singlechip when it is lifted,then it takes shale potential as the reference potential to measure SP.The field test results are satisfactory.The capacity of resisting disturbance and curve resolution are improved obviously compared with original SP logging electrode array.