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West of Shetland Rock Physics Study Phase 2

Introduction

Roknowledge West of Shetland Phase 1 consisted of a rock physics and AVO analysis of 35 key exploration and appraisal wells across 6 UKCS Quads.

Since the completion of Phase 1, a number of high profile and interesting wells have been drilled, presenting the opportunity for their inclusion into a second phase of work, to integrate and assess their rock property profiles with respect to the regional trends and models derived in the phase 1 study.

Phase 2 also offered the opportunity to include three wells from Faroese waters.

Benefits
  • The study highlights the similarities and differences in the pre-existing West of Shetland Phase 1 rock physics models and observations, and discuss their implications as observed through multi-well analysis
  • Comprehensive and consistent petrophysics, rock and fluid property analysis of 6 wells (three from UKCS and three in Faroese waters) such that they could be integrated into the Phase 1 analysis
  • 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 reviewed within the context of the trends and regional patterns from Phase 1, giving an overview of the suitability of the establlised regional trends and their predictive capabilities
  • Phase 2 provides subsurface professionals concerned with quantitative interpretation with tools to help them to quickly and easily understand the likely behaviour and seismic character of rocks of different fluid-fill, burial depth and material properties.
Deliverables

Roknowledge Atlas – “Look-up” reference tool (hard copy and 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

.rok file containing (compatible with latest release of RokDoc)

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

Petrophysical deliverables

  • Per well – LAS files, CPI (pdf) & a pdf petrophysical report and pay summary

A master Excel spreadsheet of all data – both phases

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