A new spontaneouspotentiallog model for the case when formation resistivity is not piece - wise constant was introduced.
针对非均质地层中电阻率非分块常数，提出一个新的自然电位测井模型。
2
The drill pipe log records spontaneouspotential and short and log resistivity measurements.
钻杆测井测量自然电位、短电位电阻率和长电位电阻率。
3
Spontaneouspotential (SP) of a formation has tight relationship with salinity of formation liquid, the salinity of mud filtrate in invaded zone affects SP log considerably.