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West of Shetland Rock Physics Study Phase 1

Introduction

Roknowledge West of Shetland is a rock physics interpretation study and database designed to provide a visual look-up reference of rock physics relationships and the seismic behaviour of rocks. A powerful tool which provides a regional perspective of the rock and fluid properties, explaining in situ trends and expected seismic responses at reservoir level.

Oil and gas has been found in clastic reservoirs of Eocene, Palaeocene, Cretaceous and Jurassic age and in fractured basement of Devonian/Carboniferous age in the West of Shetland area. However, Palaeocene sandstones (and hence shales) remain of primary focus in the Faroe-Shetland basin.  The exploration process has relied heavily on amplitude and AVO technology; however exploration success rates have been low compared to other analogous plays in the UKCS.

Roknowledge West of Shetland provides the regional context in which geological mechanisms are at play and their implications for amplitude based exploration in the West of Shetland.

Benefits
  • Comprehensive petrophysics, rock and fluid property analysis of 35 wells across quads 204, 205, 206, 207, 208, 209, 213 and 214
  • Interpretation of reservoirs, from principal stratigraphic sub-divisions
  • Includes analysis so that AVO anomalies can be better understood and interpreted depth trend analysis to evaluate and calibrate the AVO response of reservoirs at different depths
  • Multi-well correlations, from single well interpretations of rock properties, are established from carefully analysed core & wireline velocity logs, petrophysical, in-situ pressure & reservoir data
  • Essential to anybody de-risking new wells and carrying out post drill analysis of dry wells in the region
  • The study includes the Ichron biostratigraphic system for the West of Shetland region

Wosp1 fig2a

Deliverables

Roknowledge Atlas – “Look-up” reference tool (hard copy & pdf)

  • Details rock physics theories and methodologies
  • Analysis and seismic attributes of potential reservoir intervals within study area with discussion
  • Derived basin trends & discussion of principal relationships between reservoirs across the study area
  • Comprehensive guide to the theory & methods relevant to rock physics analysis
  • Easy to navigate – by well or level of analysis -Fully referenced back to .rok file for further interpretation
  • Detailed appendices; Petrophysics methodology including cut offs & parameters; Rock property database – properties for each reservoir unit (in situ, 100% Brine, 80% Oil, 80% Condensate and 90% Gas cases) and the reservoir overburden; Fluid Property database – fluid properties and salinities for each reservoir interval; Derived trends – Vp-Vs, Vp-Rho and Depth trends for each formation and lithology

.rok file (compatible with latest release of RokDoc)

  • Log Data: raw, initial & fluid substituted for all elastic attributes
  • Petrophysical analysis
  • Fluid and mineral data
  • Core data
  • Published and locally derived rock physics models
  • Single interface AVO models
  • 1D synthetic seismogram displays for all fluid cases
  • All project notes and conditioning records

Petrophysical report and pay summary/well (pdf)

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