Seismic Uncertainty Evaluation

1) INTRODUCTION TO SEISMIC UNCERTAINTY EVALUATION

  • Sources of Uncertainties (Data Acquisition, processing & Interpretation)
  • Validation with data examples on assessment/quantification & qualifications following standard industry practices. Introduction to new learning techniques/technology
  • Value addition on how the course will benefit an interpreter, geologist, and a Reservoir Engineer

2) SEISMIC UNCERTAINTY ASSESSMENT

  • Geological factors influence on Velocities
  • Review and evaluate various types of velocity (Average, RMS, Stacking, Migration, Pseudo, P&S)

3) SEISMIC UNCERTAINTY QUANTIFICATIONS

  • Construct geologically reasonable velocity models from the data (include synthetic seismograph creations and concept of geological/geophysical well markers).Hard and soft approaches.
  • Map migration, structural modelling & stochastic depth conversion.
  • Advance WCT(Well Constrained Tomography) workflows to construct geologically plausible models.

4) SEISMIC UNCERTAINTY QUALIFICATIONS

  • Quantifications to qualification stage: Blind well analysis, equiprobable model, multiple regression models.
  • Update depth conversion models adaptable to local geology and test them through amplitude shut-offs and closure maps
  • Evaluate structural uncertainties by performing Monte Carlo simulation on best reference depth maps
  • Evaluate the products from the multiple realizations: Probability distribution maps, multi-seed structures, amplitude conformance

Course Objectives

  • Seismic Uncertainty Analysis is a three fold approach to support well planning: Assessment, Quantification & Qualification
  • Data Analytics is a must to understand data leading to decision (Data2Decision)
  • Learn to qualify and quantify your seismic uncertainties: Deterministic and Stochastic
  • Deploy Equiprobable models for Uncertainty assessments and qualifications
  • Monte Carlo regression engine provides a relatively optimum P10/P50/P90 Volumetric ranges
  • Uncertainty reporting and well planning

Course Outline

1) SEISMIC UNCERTAINTIES ASSESSMENT

  • Standard practices to evaluate and estimate the Seismic Depth Uncertainties
  • Risk and Myths
  • Why Quantification & Qualification of seismic depth uncertainties is important in E&P?

2) QUANTIFICATION OF UNCERTAINTIES (SEIS2WELLS)

  • Deterministic Depth Conversion– Hard And Soft Approaches
  • Probabilistic Depth Conversion – Variogram & uncertainty modelling
  • Additional Techniques: Map Migration, Equiprobable models

3) ADVANCED RAY BASED DEPTH CALIBRATION (WELL TOMO)

  • – Tomography Approach For Geological Plausible Velocity Models : Vertical Ray Tomography
  • – Why it is better de-risking model? Predictions away from the hard data

4) QUANTIFICATION TO QUALIFICATION

  • – Blind Well Analysis to test the best technical cases
  • – Multiple regression models
  • – Equiprobable modelling

5) QUALIFICATION OF UNCERTAINTIES : DRILL READY SEISMIC (DRS)

  • Structural Flexing To Compute Probabilistic Volumetrics
  • Spill Point Control And Amplitude Conformance Volumetrics
  • Single And Multi-Seed Closures
  • Probability And Iso-Probability Closure Maps
  • Stacked Reservoir Volumetrics

6) DEPTH RISKING SCORECARD

  • Uncertainty Risking Scorecard
  • Depth Uncertainty Communication Well Planning and Decision Making from the Uncertainty Cube
  • Participants’ Profile
  • The course is designed for Geologist, Geophysicist, drilling Engineers and Reservoir Engineers
  • Prerequisites
  • Participants require a working knowledge on basic exploration cycle
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