复杂地层电阻率测井方法思考

. On Resistivity Logging Method for Complex Formation.

利用电阻率测井资料判断油气层时，电阻率值法和径向电阻率差异法是常用的两种解释方法。在复杂岩性地层条件下，电阻率值法难以克服岩性、物性和地层水矿化度变化等因素的影响；相比之下，径向电阻率差异法是较为适用的解释方法。但是，由于目前电阻率测井的分辨率不匹配，深、浅电阻率资料不能反映储层径向电阻率变化，无法采用径向电阻率差异法解释。地电模型和实际资料说明，在现有的技术条件下，通过改进测井仪器和采用先进的资料处理方法，如反演，可以得到地层径向电阻率差异。

Two interpretation methods, resistivity value method and radial resistivity contrast method, are often used for identifying oil/gas zones with resistivity logging data. As for complex formation, resistivity value method is difficult to eliminate the effects of lithology, physical property and formation water salinity, etc. The radial resistivity contrast method is more adaptable. But, it can not be used because the resolution of current resistivity logs are unmatched with each other and the resistivity data from deep/shallow laterolog cannot reflect the radial resistivity changes of reservoirs. Geoelectric model and field data show radial resistivity contrast can be gained by improving the logging tools and using the advanced data processing technique, such as inversion, thus, laying the foundation for the radial resistivity contrast interpretation method.