High formation water salinity reduces resistivity contrast between oil layer and water layer.
高矿化度的地层水，降低了油层与水层的电阻率对比度。
These cases occur most often in horizontal Wells, or vertical Wells with the combined effects of invasion and large resistivity contrast between beds.
这种情况常出现在水平井或者有侵入影响并且层间电阻率对比度高的直井中。
The reservoirs often form the low contrast resistivity oil layers because they have the dual pore networks, that is, fractures and pores.
该储层具有裂缝-孔隙双重孔隙网络，常形成相对低电阻率油层。
The reservoirs often form the low contrast resistivity oil layers because they have the dual pore networks, that is, fractures and pores.
该储层具有裂缝-孔隙双重孔隙网络，常形成相对低电阻率油层。
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