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There are many reasons for low resistivity pay zones phenomenon. It is of crucial importance to know the origin of this phenomenon. The problem with these zones is that the resistivity data interpretation indicates high water saturation, but oil or even dry oil will be produced. This paper discuss the different reasons sandstone reservoir can have low resistivity. Clean oil bearing sandstone has high resistivity, but when this rock contains shale, or heavy minerals such as pyrite, the resistivity can become low. This paper deals with the case of shaly sand formation as a low resistivity pay zone. Different shaly sand models will be applied. It has been found that the modified total shale sand model gives good results. Field example is presented to show the results of different models.

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