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Evaluating the Gap between Seismic-scale and Well-scale Observations of Structure - A North Sea Case StudyNormal access

Authors: R.M. Williams, E. Pascual-Cebrian, G. Paton and J.C. Gutmanis
Event name: 78th EAGE Conference and Exhibition 2016
Session: Fractured and Carbonate Reservoirs
Publication date: 31 May 2016
DOI: 10.3997/2214-4609.201601167
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.47Mb )
Price: € 20

Fault and fracture studies for reservoir characterisation have been an essential stage of prospect generation and field development from seismic data and well data respectively. Commonly well image logs are used to predict fracture intensity and orientation, or small scale faults from seismic interpretation are used. These results are then scaled up/down respectively and applied on a reservoir scale. The biggest ambiguity with either of these processes relates to scale. The aim of this study is to analyse the reliability of fracture trends between well and seismic data to improve fracture pattern identification and delineation in offshore Netherlands (Block E), Southern North Sea. Two independent studies were performed, a well driven fracture analysis and a seismic driven fault analysis, and the two results were compared. The seismic fault study was undertaken using Cognitive Interpretation workflows to illustrate the potential of small scale faulting and fracture lineaments. The fracture study used image logs to identify fracture orientation and intensity. When the detailed multi-attribute analysis and well image logs analysis are compared a distinctive overlapping pattern in the faults/fractures begins to appear. Supporting the theory that the seismic to well gap is closer than ever before.

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