Saudi Arabian Oil Company

David Kersey

Ramsin Yacood Eyvazzadeh

Denis P Schmitt

Charles Bradford

George Saghiyyah

Hilal Al-Waheed

A determination of the free water level for a hydrocarbon-bearing reservoir is provided that accounts for the different classified rock types (that is, facies) in the reservoir. The free water level for each unique combination of facies is determined using a least squares minimization between a reference bulk volume of oil (B) determined from well logs a bulk volume of oil (B) calculated from a saturation height function for each of the facies present in the reservoir. Systems and process for determining the free water level are provided.

Rock type based free water level inversion

A system and method identify hydrocarbon productive reservoir zones using Monte Carlo numerical analysis to account for uncertainties in log measurements and petrophysical parameters. Random errors in logging tool responses and core measurements, as well as reservoir heterogeneity, are incorporated in a Monte Carlo simulation to output appropriate petrophysical models to calculate statistical distributions for saturation and permeability to define productive zones, non-productive zones and zones of undetermined productivity as a basis of deciding whether additional logging, core sampling or well test data are needed to reclassify the undetermined zones as either productive or non-productive. As uncertainties are quantified in the analysis, the degree of certainty in determining productive and non-productive zones is known and can be used to decide whether to further test, stimulate or abandon reservoir zones.

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Dhahran, Saudi Arabia

David Kersey