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.
