Seismic Inversion and Modeling Discriminates Porosity and API Gravity in the Sabriyah Field, Kuwait

In the Sabriyah field of northern Kuwait, the majority of wells tested in Tuba limestone member of the Cretaceous Ahmadi Formation found heavy oil (API<20o). Oil from a few wells is reported to be above 20o API and the average field production is around 1300bbl/day from 3 producing wells. For optimal development of the Tuba reservoir it is crucial to identify areas containing higher API gravity oil. Due to high variation of well productivity in the area, it was a challenging task to precisely map the area of relatively higher API oil. Using post stack seismic inversion and porosity modeling a productive area of relatively higher porosity and higher oil API gravity was successfully delineated.