underexplored plays ii - oljedirektoratet · • best practices (old play models) ... (sequence...
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Underexplored Plays IIGeophysics Applications in Risking (Intro)
Per Avseth (NTNU)
Force seminar, Stavanger 23-24. November 2016
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The times they are a-changing
• Conventional seismic Broadband seismic
• Qualitative interpretation (post-stack) Quantitative interpretation (pre-stack)
• 3- and 4-way closures/structural highs Subtle traps with stratigraphiccomponents
• Geological concepts + Geophysical support Integrated workflows
• Best practices (old play models) Creative thinking (new play models, out-of-the-box)
How do we change/update our risking procedures accordingly?
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A
Anomaly hunting vs. hydorcarbon prediction
DHI driven prospect: Screening Anomaly hunting Supporting geological concept
DHI supported prospect: Struct. Interpr. + conceptual model Geophysical support.
Geology-Geophysics integration: Iterative approach with alternative scenarios and model updates. (Falsification and devil’s advocate approach).
Avseth et al. (2016), AVO class III Brown (2012), AVO class IIp
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Integrating geology and geophysics
Geology GeophysicsRock Physics
Bottle-neck Few observablesMany parameters
Ambiguities
QI prediction
Limitations/ResolutionUncertainties
Pit-fallsMore/Better data!More knowledge!
More integration!
ComplexityNoise/Artifacts
Variability
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The road ahead…
Big data analysis: • Data volume increase + computer capacity improvement
• Statistical classification, pattern recognition, visualization
Don’t forget the physics!
Integrated QI workflows: • Geologically constrained inversions (Sequence stratigraphy, Depth trends)
• Rock physics/geophysics integrated with petr. syst. analysis, basin modeling, etc.
Mind the gap!
Improved technology and new innovations: • Broad-band technology and full wave-form inversion
• Joint inversions (seismic, CSEM, grav-mag)
• Co-visualizations and geobody extraction (e.g., AVO + spectral decomposition)
Think outside the box!
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Geophysics applications used in risking: (Program)
• Rob Simm (Origo): Key note; Geophysics and risk – a sense check.
• Morten Blixt (Norsar): Assessing CSEM uncertainties during exploration.
• Ryan Williams (GeoTeric): Derisking the Gohta appraisalwell location using a Cognitive Interpretation workflow.
• Bill Shea (Sharp Reflections): Pre-stack seismic methods to identify new prospects and reduce exploration risk.