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Full-Waveform While-Drilling Seismics, a Case Study from the Grane Field, the North Sea Normal access

Authors: J.B.U. Haldorsen, R.T. Coates, S.A. Petersen, A. Hawthorn and M. van Schaack
Event name: 66th EAGE Conference & Exhibition
Session: Well Seismic
Publication date: 07 June 2004
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 4.42Mb )
Price: € 20

P231 FULL-WAVEFORM WHILE-DRILLING SEISMICS A CASE STUDY FROM THE GRANE FIELD THE NORTH SEA Introduction 1 R.T. COATES 1 J. B.U. HALDORSEN 1 S.A. PETERSEN 2 A. HAWTHORN 3 and M. VAN SCHAACK 4 In most exploration and in some development wells the seismic map is the primary guide for well placement. The estimated depth to a seismic target is based on certain assumptions with regard to the anisotropy of the formation. These assumptions are necessary because the surface-seismic data give poorly constrained estimates of the vertical velocities. However borehole-seismic travel times give a direct calibration of the vertical velocity

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