The wettability of rocks is of critical importance in understanding reservoir dynamics. Several studies of wettability evaluation on Saudi Aramco reservoir rocks were reported, but to our knowledge, none of them have attempted to study wettability on the pore scale level. In this study wettability evaluation of carbonate rock samples of Saudi Aramco reservoirs were investigated using environmental scanning electron microscope (ESEM). The data obtained gives access to the distribution of oil and water in relation with mineral interface which can not be observed by normal techniques. It also improves the understanding of rock/fluid interaction.

In this study preserved rock samples from two distinct reservoirs (Arab-C and Shu'aiba) were used. The mineralogical analysis showed that the predominant minerals were calcite and dolomite in both samples. Determination of wettability using ESEM method is very cost effective. It is unlike other traditional methods. It doesn't use any chemical or even generate by-products; it is not time-consuming and provides better quality data at much lower cost.

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