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Central North Sea Rock Physics with Pressure Study

Introduction

Roknowledge CNS is an integrated rock physics with geopressure study designed to identify and unlock hidden potential within the Eocene, Palaeocene, Cretaceous, Jurassic and Triassic intervals.

This unique study includes 35 wells from across a broad area of the Central North Sea (CNS). Our expert rock physics and geopressure teams generated a fresh and up to date interpretation of the key pressure and rock physics mechanisms in the CNS which control or contribute to the seismic behaviour of key reservoir intervals.

Curate Delivery

The study is delivered through Curate as an interactive atlas enabling: 

  • Instant access through a web browser to interactively view all information and knowledge captured within the study, with access to download of all primary study deliverables 
  • Collaboration by creating ‘projects’ for specific groupings of people to work on exploration and appraisal  projects, creating well views, AVO scenarios, maps, cross correlation panels etc 
  • Ability to make trend maps from well attributes such as markers (depth) and logs 
  • Ability to rapidly create AVO scenario models across all study wells and intervals – model fluid, lithology, porosity variations 
  • Streamlined workflows for all stakeholders with applications from geophysical interpretation (seismic modelling) through to engineering (rapid access to petrophysical sums/averages for reservoir property modelling)
Benefits
  • Maximize valuable resources by focusing on answering questions rather than finding data. 
  • Enable more robust analysis drawing on regional knowledge not available in local studies. 
  • Speed up license applications with the insight to rapidly de-risk prospects. 
  • The study includes a detailed interpretation and determination of the 1D pore pressure profiles in every well and integration of this information with in depth rock physics analysis of each well on an interval by interval basis
  • A regional interpretation and overview, highlighting consistent patterns but also identifying areas of anomalous behaviour
  • A set of models have been constructed allowing the end user to better understand and predict the likelihood of success at a given location in the study area
  • A key to success is the ability to understand the uncertainty in a prediction – something this study addresses

Deliverables

.rok file (compatible with the latest edition of RokDoc):

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

Petrophysical deliverables:

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

A master Excel spreadsheet of all data

Roknowledge Atlas (hard copy and pdf):

  • “Look-up” reference tool
  • Digest of the regional geology of the CNS
  • Comprehensive guide to the rock physics and geopressure theory and methods applied during the study
  • Multi well rock physics trend analysis per formation
  • Introduction to the pressure system of the CNS
  • Single well analysis presented per formation, per well
  • Case Studies; Fluid property analysis within the CNS; Effective Stress Relationships in the Jurassic; Rock Property Analysis Comparison of the Tertiary and Jurassic Strata of the CNS
  • A discussion of implications for exploration
  • Easy to navigate – by well or level of analysis
  • Fully referenced back to .rok file for further interpretation
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