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A Strategy for Effective Local Updates of the Geological Structure in an Earth Model during Drilling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00125
- ISBN: 978-90-73834-27-9
Abstract
The increased amount of subsurface measurements available in real-time while drilling with wired pipe opens new possibilities for optimisation of well placement. The continuous stream of new information reduces uncertainty and allows revisions of the geological interpretations made prior to the drilling operation. When the most current and precise knowledge is required and the time available to update the earth model is limited, methods that support effective, local model modifications are essential. We demonstrate a strategy where grids are replaced by flexible geometrical transformations. It allows separate management of geological structure and spatial petrophysical properties. The transformations enable effective structural modifications in an earth model without compromising existing representations of petrophysical properties. Principles of the methodology are exemplified by demonstrating automatic insertion of new faults and pinch-in of new sedimentary layers. The modifications are based on information received during the drilling process, where geological markers interpreted during the operation constrain the alterations.