A 3D presentation of the information conveyed by sedimentary dips is proposed, a series of block diagrams is drawn along the borehole trajectory. The diagrams which correspond to individual cross-bed units are oriented along the principal directions of deposition of these units and extend to few meters around the wellbore. The reconstruction of bedform geometry away from the wellbore, along the walls of each cubic block diagram, is constrained by the information available on the cylindrical borehole wall. This task is achieved by numerically solving an inverse problem. A 3D reconstruction of the spatial distribution of electrical conductivities is also performed. A case study from cross-bedded deposits is shown to illustrate the technique.
Near-wellbore 3D reconstruction of sedimentary bodies from borehole electrical images
1998
Seiten, 7 Quellen
Aufsatz (Konferenz)
Englisch
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