How Big an Elephant Can Be
A. Mannini and S. Pearse
Event name: 76th EAGE Conference and Exhibition 2014
Session: Building and Updating of Subsurface 3D Models
Publication date: 16 June 2014
Info: Extended abstract, PDF ( 1.08Mb )
Price: € 20
Johan Sverdrup was one of the world´s largest discoveries during the 2010-2011 period and is one of the largest discoveries ever made on the Norwegian shelf. The Johan Sverdrup Field is an oil discovery in licences PL265, PL501 and PL502, located in a half-graben on the Utsira High, approximately 140 km off shore. An extensive appraisal program is still ongoing at the end of 2013 with a total of twenty-nine wells including exploration, appraisal and associated side-tracks drilled to date. Since the oil accumulation is spread over a large area and is characterized by a very flat structure, relatively small uncertainties in velocity and time interpretation, and therefore in depth, result in considerable uncertainty in Gross Rock Volumes (GRV) and the field outline. Since a proper assessment of the STOIIP is crucial information for a successful field development, extensive efforts were made to fully understand the GRV distribution using both stochastic and deterministic approaches. The distribution was captured using several meaningful reservoir depth surfaces which in turn have been used to investigate the distribution of STOIIP.