RESERVOIR EVALUATION
a)Depositional models-reservoir development relationship
b)Lithology of reservoirs(limestone,dolomite, sandstone etc..)
c)Depth of producing formations
d)Net pay thickness evaluations from log and drilling data
e)Porosity evaluation
– Porosity and depositional environments
– Primary porosities(intergranular, matrix, leacing, dolomitization etc…)
– Secondary porosities (dolomitization, fracture etc…)
– Porosities from logs(BHC, FDC-CNL, Neutron…)
– Porosities from thin sections
– Porosities from cores
– Porosities from capillary curves
– Areal porosity distribution maps
-Porosity barrier maps
f)Permeability evaluation
-Permeability and Permeability relationships
-Primary permeability,related to intergranular porosity
-Secondary permeabilities(fructure porosity,dolomitization, leaching,unconformities and permeabilities)
-Permeabilities from logs(SP and cross-plots))
-Permeabilities from cores and thin sections
-Permeabilities from capillary curves
-Permeabilities from seismic sections
-Geotermal gradients and oil distribution in reservoirs
-Geotermal gradients anomalies
l)Salinity evaluations
-Salinity from DST data
-Salinity from logs
-Hydrodynamics-salinity relationships
-Salinity distrubition maps
-Piezometric surface-salinity-oil accumulation relationship
-Salinity anomalies
g)Pressure evaluation
-Reservoir pressure evaluation from DST data
-Pressure gradients
-Over pressure zones
-Well head pressures
-Fault-pressure relationships
-Pressures in fault-blocks
-Pressure communications in different reservoir horizons
-Pressure oil-migration relationship in resevoir levels, influence on OWC.
h)Oil-Water, Gas-Oil, Gas-Water Contacts.
-Tectonic, Sedimetology and OWC’s
-OWC from DST data
-OWC from log evaluations
-OWC from core analysis
-PTS (Pore Troat Size) evaluation from capillary curves and OWC determination in reservoirs
i)Oil characteristics
-Gravity(ºAPI)
-Density
-Viscosity
-Parafin
-Sulphur
-H2S
-GOR (Gas Oil Ratio)
j)Gas characteristics
-Gravity
-Compressibility
-Methane,Ethane…….content
k)Temperature evaluation
-BHT (Bottom Hole Temperatures)
-Temperature anomalies(high and low temperatures)
-Fault-Temperature relationships
-Hydrodynamics and temperatures
-Fractured zone evaluations from logs