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地层水电阻率R_w是一个重要的解释参数。如果有水样,可直接测量R_w或根据水样化学分析资料计算。然而,根据自然电位测井计算R_w,则是更实用的。水样测量值与SP计算值之间的相关性较差,这是共同的。尽管自然电位测井的基本方程SP=-Klog(a_w/a_(mf))是经过检验的,但作者相信作两方面的修改是必要的。首先,直接用电阻率R_w和(?)_(mf)表示化学活度a_w和a_(mf),因为采用人为规定的等效电阻率R_(we)和R_(mfe)并没有更大的必要性。其次,发现参数K随泥岩电阻率R_(sh)而变,从而绘制了SP与R_(sh)、R_(mf)和R_w有关的新图版。新图版的应用,使SP计算的R_w值与水样测量值之间的相关性大大改善。
The formation water resistivity R_w is an important explanatory parameter. If a water sample can be measured directly R_w or calculated according to water samples chemical analysis. However, it is more practical to calculate R_w from natural potential logs. It is common that the correlation between the water sample measurement and the SP calculation is poor. Although the basic equation SP = -Klog (a_w / a_ (mf)) for natural potential well logging has been tested, the author believes that it is necessary to make two modifications. First, the chemical activity a_w and a_ (mf) are expressed directly by the resistivity R_w and (?) _ (Mf) because there is no greater need to use the human-defined equivalent resistivities R_ (we) and R_ (mfe) Sex. Second, it is found that the parameter K changes with the resistivity of the mudstone R_ (sh), so that a new plate of SP related to R_sh, R_mf and R_w is drawn. The application of the new plate greatly improves the correlation between the SP calculated R_w value and the water sample.