Petrophysical property evaluation of cretaceous aged reservoir rocks in cobandede area in the south of Adıyaman province

This study aims to utilize well data to evaluate and examine petrophysical properties of Cretaceous aged reservoir rocks in the South of Adiyaman in terms of porosity, clay volume, hydrocarbon saturation. DST, coring and logging were applied to analyze reservoir and petrophysical properties of the formation. Porosity values obtained from the logs were compared with those obtained from the cores. Porosities calculated from the cores yielded lower values. Oil-cuts in mud were observed in several DSTs (Drill Stem Test), whereas high reservoir pressures were noted to be related to fracture systems. High effective porosities were also encountered starting from the top of Karababa-C member. Water saturation maps were prepared for the study area. The maps stated that the depth of the water saturation increases toward the North West, which can be elaborated as such areas that stay above the Oil-Water-Contact (OWC) are oil-bearing. Lithological differentiation and changes caused by faulting are thought to be the main reasons for the OWC differences in the study area.