Investigative petrophysical fingerprint technique using conventional and synthetic logs in siliciclastic reservoirs: A case study, Gulf of Suez basin, Egypt

Typically pressure gradients and density-neutron crossover are used to differentiate between reservoir water, oil and gas. This study investigates fluid type in the Badri Field, Sidri sandstone reservoir of four offshore wells, A, B, C and D. These wells lack pressure or well test data and density-neutron fluid interpretation remain equivocal. In addition, these wells have not been tested before. Hence, a new technique adopted from the geochemical fingerprint technique termed petrophysical fingerprint has been used to distinguish equivocal petrophysical characteristics. In this study, the petrophysical fingerprint was used to distinguish fluids, a combination of synthetic and raw logs was plotted on crossplots charts and correlated to previous oil and gas well tests. This study revealed that, 1) the Petrophysical Fingerprint technique was found to clarify otherwise ambivalent log responses, lending confidence to the Badri Field interpretation, 2) the petrophysical fingerprint strategy showed notable results, resulted in gas signature fingerprint in the well B, while showing an oil signature fingerprint in wells C and D. 3) In comparison to the traditional plotting method, the petrophysical fingerprint technique has the advantages that the correlation between the obtained petrophysical fingerprints of the individual petrophysical characters and the unknown investigated petrophysical character will increase the precision of the petrophysical investigation process, which in turn will guarantee a reliable judgment on the investigated petrophysical properties, 4) the authors refer to some caution, where more or less homogeneous reservoir characteristics are preferred to correlate petrophysical fingerprints signatures, else at least the reservoir to be not highly heterogeneous, where homogeneous reservoirs are not common in reality.