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Method to Generate a Watertight Geological Model Directly from a Seismic VolumeNormal access

Authors: F. Pauget and S. Lacaze
Event name: 79th EAGE Conference and Exhibition 2017
Session: Building and Updating Subsurface 3D Models I
Publication date: 12 June 2017
DOI: 10.3997/2214-4609.201701145
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.7Mb )
Price: € 20

Summary:
This paper presents a novel method to compute a watertight geological model directly from seismic data. Whereas existing workflows rely on complex process based on a few horizons and faults, the approach is based on a grid made of numerous horizon patches and a set of faults. Spatial resolution of the grid depends on the patch size and the vertical resolution relies on the seismic trace extrema. A chronostratigraphic ordering is done using the Relative Geological Time approach (Pauget et al, 2009). Based on this grid, 2D watertight geological models are created along seismic lines, sampled at a regular step in the inline and crossline directions, by defining stratigraphic units without limitation. A 3D triangular meshing is then performed by synchronising the relative geological times between intersecting 2D models. Therefore this method creates watertight models with higher level of accuracy and directly from the seismic data. It provides an interactive, fast and robust workflow where any change of the interpretation is applied directly on the model. It then allows extracting fault polygons, characterize sealing properties. Moreover, geocellular grid could be generated for reservoir simulation applications.


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