摘要
目前，用常规测井资料评价水淹层的技术难点是地层混合液电阻率的计算。自然电位是较好反映混合液矿化度变化的测井信息。测井中测得的自然电位包括薄膜电位和过滤电位，当泥浆柱压力与地层压力的压差较小时，过滤电位可忽略不计，但当压差大于３．４ＭＰａ时则必须考虑过滤电位的影响。该文介绍了过滤电位的产生机理和计算过程；
t present, the tough point in evaluating watered out formation with regular logging data lies in the calculation of the resistivity of mixed formation liquid. Spontaneous potential can reflect the salinity change of mixed liquid. The logging data from SP include membrane potential and electrofiltration potential. If the pressure difference between the mud column and formation pressure is small, the electrofiltration potential can be neglected, but if the pressure difference is more than 3.4MPa, the influence of electrofiltration potential must be considered. This paper presents the producing mechanism and calculation procedure of electrofiltration, the correction method of spontaneous potential. It also discusses the calculation of the resistivity of mixed fluid with corrected spontaneous potential.
关键词
油田开发
注水开发
自然电位
水淹层评价
self potential, correction, watered out, formation, evaluation, mixing, liquid, resistivity, filtration, electric potential
