Discipline Geophysics
LevelSkill
Duration5 Days
Delivery Mechanism Classroom
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Seismic Petrophysics and Rock Properties

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Seismic petrophysics is the careful and purposeful use of rock physics data and theory with well-log data in the interpretation of seismic observations. The course begins with simple commonly used models and continually expands on them to include increasingly complicated and realistic interpretations. At each step, the relationships between laboratory, theory, well-logs, and seismic data are investigated. A set of spreadsheets that incorporate many of the models, predicting fluid properties, rock properties, and seismic response (including AVO and elastic impedance) is provided; exercises will be completed in class using simple calculations as well as these spreadsheets. The rock types covered include unconsolidated and consolidated clastics, carbonates with vugs and fractures, shales, and heavy oil formations. Examples are drawn from around the world.

At the conclusion of the course, students should be able to understand the application of rock physics models and theory, to combine those with well-log information in a petrophysical evaluation, and to employ the results in modeling and interpretation of seismic data.

  • Agenda
  • Audience
  • Prerequisites
  • Agenda

    Day 1

    Part 1: Fundamentals

    • Porosity and velocity
    • Effect of clays on velocities
    • Invasion, fluids
    • Simple mixing laws (Voigt, Reuss, etc)
    • Critical Porosity
    • Hashin-Shtrikman bounds
    • Fluid substitution ; Gassmann equation
    • Fluid mixing; patchy saturation

    Day 2

    Part 2: Log Data; Post-stack Attributes

    • Vp and Vs; Poisson’s ratio
    • Using M instead of K if no Vs
    • Sonic and Dipole logging
    • Seismic processing
    • Post-stack attributes
    • Interval attributes
    • Unique attributes

    Day 3

    Part 3: Seismic Data and Pre-stack Attributes

    • Pre-stack seismic processing
    • Model scenario of production
    • Pressure-dependence of properties
    • Angle-dependent rock physics
    • Pre-stack attributes
    • 3-term and 2-term approximations
    • Lamda-rho etc

    Day 4

    Part 4: Fluids and Inversion

    • Fluid properties
    • Spreadsheet solutions
    • Rocks and fluids
    • Empirical relationships
    • Acoustic inversion
    • Case study of time-lapse monitoring
    • Elastic inversion
    • Stochastic approaches
    • Rock physics templates

    Day 5

    Part 5: Complicated Rocks and Advanced Topics

    • Kuster-Toksoz “crack” model
    • Coal as a special example
    • Xu and White model for shaly rocks
    • Other models for shaly rocks
    • Petrophysical Inversion
    • Importance of scale
    • Phantom horizons
    • Carbonate rocks
    • Heavy Oil
    • Spectral content
    • Thin-bed problems
  • Audience

    This course is intended to be taken by geoscientists and engineers with some experience in at least one of the following: petrophysics, seismic interpretation, seismic processing, reservoir characterization, or reservoir engineering. It is not expected that any participants will have experience in more than one of those fields, but this course will allow the participants with expertise in one field to understand the relationships of petrophysical data and seismic interpretation for reservoir characterization, and to communicate with others in any of those fields.

  • Prerequisites

    General knowledge of both Petrophysics and Geophysics

  • Prerequisites

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Nairobi, Kenya February 12 - 23, 2018
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