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Principles for a Hierarchical Earth Model Representation Aiming Towards Fit-For-Purpose Grid ResolutionNormal access

Authors: E. Suter, T. Kårstad, A. Escalona, H.A. Friis and E.H. Vefring
Event name: 81st EAGE Conference and Exhibition 2019
Session: Poster: Geomodelling from Facies to Fractures A
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201900709
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 698.84Kb )
Price: € 20

Poor control with grid resolution has been identified as one of the major limitations within current earth modelling technologies. A main reason is the inflexibility of the structural model that the grid is adapted to. Aiming for fit-for-purpose optimization of earth model grid resolution, we summarize the principles of a hierarchical, nested representation of geological interfaces and volumetric regions in correspondence with geological principles. When generating an earth model grid, each region can be either discretized or further subdivided using the geological interfaces in its interior in a recursive manner. Control with the resolution of the geological structure thus enables better control with the resolution of the grid. The method targets improved local control with the trade-off between model resolution and time spent for computation in grid-based modelling and simulation exercises. This is achieved by allowing a higher model resolution where it matters most to the application at hand while gradually ignoring details elsewhere. Also uncertainties in the structural geometries and topology are managed. Applications of particular interest include workflows where computation time is a major limiting factor, such as geosteering and interactive geological interpretation. However, a successful development could potentially benefit any grid-based subsurface workflow.

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