The Operator, The Reservoir & Gross Rock Volume Uncertainty The sole owner of the fi eld is the Abu Dhabi National Oil Company (ADNOC) with Abu Dhabi Marine Operating Company (ADMA-OPCO) as the operator. ADMA is a major producer of oil and gas from the off- shore areas of the Emirate of Abu Dhabi and was established in 1977. The reservoir in question is in the appraisal/early development stage with nine wells unevenly distributed across the fi eld and not all of them having penetrated the bottom of the reservoir. The quality of the seismic data is also only fair with limited well and seismic data. There was therefore limited confi dence in the velocity model. Against this background, there was a need to quantify uncertainty within the reservoir model and in particular Gross Rock

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