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