Petrophysical heterogeneity in a Lower Cretaceous limestone reservoir, onshore Abu Dhabi United Arab Emirates

摘要

The upper zone of the Lower Cretaceous Kharaib Formation (151-177 ft [46-54 m] thick in the studied wells) is a major oil reservoir in several giant oil fields. Wide variations in porosity and permeability of this zone have been shown to result from both the inhibition of burial cementation by oil in the crest of each field and localized cementation adjacent to stylolites, combined with the more subtle influence of widely varying depositional mud content and grain size. The present study examines these relationships in closer detail, using core and petrographic observations from two wells on the oil-filled crest and two wells on the water-filled flanks of a giant domal oil field.