Core and well logs interpretation for better reservoir characterization in Shushan Basin, Egypt

Petrophysical evaluation has been done for the Alam El Bueib-3D sandstone reservoir in Qasr oil field, Western Desert of Egypt, using well logs and core data. The analysis of all data showed that the thickness of the AEB-3D Member decreases towards northeast and northwest directions and increases due to the south and north of the study area. The effective porosity ranges between 9 and 13%, water saturation values range between 7 and 71%, and average net sand thickness ranging from 75 to 213 ft. The trend of sand distribution is aligned NE-SW, which may be the direction of the sand channel. The average pays thickness ranges between 6 and 67 ft and gradually increases to both east and west directions. Statistical analysis of conventional core data showed that helium and fluid porosities mean equals 8 to13%, and 7 to 13% respectively, which indicate a reservoir with fair porosity. It is also found that the horizontal and vertical permeabilities mean equal 105–180, and 97 to 114 millidarcy (mD) respectively, which indicate a homogeneous reservoir with good to very good permeability. Moreover, the horizontal permeability-helium porosity relationship showed increasing positive trend, with a moderate to strong correlation coefficient (+ 0.4– + 0.7). The neutron-density cross-plot showed that data are clustered along the sandstone lithology line, and is located in the porosity values between 10 and 20%. The results concluded that the best petrophysical parameters were encountered toward the eastern and western parts of the studied Qasr Field.