Comprehensive Petrophysical Evaluation of Reservoir Formation Utilizing Well logs and Reservoir Engineering Data, A case study in Palouge-Fal Field, Melut Basin - South East of Sudan

Abstract

A comprehensive petrophysical evaluation in shaly sand reservoirs for Palouge-Fal oilfield, Melut basin, Sudan, manifested greater accuracy in the petrophysical evaluation by integrating petrophysical data and reservoir engineering data. The result of the evaluation was utilized to investigate the low productivity from some zones and its relation with depositional process and petrophysical properties, and hence, a new method was introduced in this study to identify the reservoir quality by using spectral gamma ray. Also, in this study the performance of various shaly sand saturation equations was compared to the water saturation that calculated from drainage capillary pressure. All the evaluated shaly sand equations can produce acceptable saturation results for the shaly sand reservoirs that have been part of this study as long as suitable shale parameters are selected. The wireline logging, mud logging, well testing, and core data had been carefully evaluated during the process of the data application, and data quality was thought to be good. All kinds of petrophysical parameters have been selected for log interpretation in the area of the study, and accomplished the six wells processing and interpretation in the area. Eventually, the results obtained using the shaly sand evaluation techniques, discussed in this study, were in better agreement with core and test data. Consequently, the methods and techniques in the shaly sand models presented in this study can be used to improve petrophysical evaluation of shaly sand reservoirs.