提高自然电位测井分辨率的有效方法

The effective methods for improving the vertical resolution of spontaneous potential log

扼要分析了地层厚度对自然电位测井曲线纵向分辨率的影响因素。并以此为出发点,从测量方法、电路设计等方面,阐述了提高自然电位测井曲线纵向分辨率的具体方法。采用文中设计的电路,在同一口井中分别进行井壁、偏心环电极和居中点电极自然电位测井,结果显示井壁自然电位曲线纵向分辨率最佳,能够有效识别薄互层,可以满足高分辨率测井平台统一纵向分辨率的要求。

The factors that the vertical resolution of spontaneous potential(SP) log influenced by the reservoir thickness is briefly analyzed. Concrete methods for SP measurement and acquisition circuit are introduced to improve the vertical resolution of SP log. Using the circuit designed in the paper, traditional point, ring electrode and proximity-to-sidewall SP log was run respectively in a same well. The result shows that the proximity-to-side SP log has the best vertical resolution, which is able to meet the demand for high resolution express logging platform and to detect thin interbed effectively.