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SC-9 Understanding Seismic Anisotropy in Exploration and Exploitation: Hands On

Society of Exploration Geophysicists (SEG)

Thursday, 23 September Sunday, 26 September 2021, 9:00 a.m.–1:00 p.m.  |  Denver, Colorado

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Who Should Attend

The course is designed for those with a few years of experience in conventional reflection seismic analysis.

Intended Audience:
Intermediate Level

Objectives

Class participants will be able to discuss with colleagues:

  • the physical principles of seismic anisotropy, with examples
  • the application of these principles to P-wave imaging, specifically including the effects on moveout
  • the application of these principles to physical characterization of the subsurface (specifically including the effects on P-wave reflection amplitudes), using anisotropic rock physics
  • the application of these principles to S-wave data, specifically including shear wave splitting
  • the application of these principles to Converted-wave data, specifically including registration, diodic moveout, effective Gamma, and C-wave splitting

Course Content

All rock masses are seismically anisotropic, but we often ignore this in our seismic acquisition, processing, and interpretation. The anisotropy nonetheless does affect our data, in ways that limit our effectiveness in using it, if we ignore that anisotropy.

In this short course, we will understand why this inconsistency between reality and practice has been so successful in the past, and why it is less successful now and in the future, as we acquire better seismic data, and correspondingly higher expectations of it. We will further understand how we can modify our practice so as to more fully realize the potential inherent in our data, through algorithms which recognize the fact of seismic anisotropy.

To use the seismic data for subsurface physical characterization, we will require the application of anisotropic rock physics. This more realistic basis for seismic exploration and exploitation is particularly important (naturally!) for the shale resource. We will see that the anisotropy, although usually weak (when defined as a rock property), has weak effects on some seismic data, strong effects on other seismic data, and sometimes completely novel effects. The course is accompanied by numerous class exercises, presented in .xls format.

Course Outline

  1. Physical principles (Day 1, morning)
    1. Definition of anisotropy
    2. Anisotropy vs.heterogeneity
    3. Anisotropy as a function of scale
    4. Elasticity and Symmetry
    5. The Power of Notation
  2. P-waves: imaging (Day 1, afternoon)
    1. Polar anisotropy
    2. Azimuthal anisotropy
    3. Slowness ellipses
  3. P-waves: characterization (Day 2, morning)
    1. Polar anisotropy
    2. Azimuthal anisotropy
    3. Stress and Fractures
  4. S-waves: (Day 2, afternoon)
    1. Polar anisotropy
    2. Azimuthal anisotropy: S-wave splitting
    3. Crossed-dipole sonic data
  5. C-waves: (Day 2, afternoon)
    1. C-wave basics
    2. Polar anisotropy
    3. Azimuthal anisotropy: C-wave splitting
  6. Epilogue: (Day 2, afternoon)

Fees

Fee:
Non-Member: $600
Member: $500
Student Member: $250
Limit:
30 People
Educational Credits
1.6 CEU

Venue

SC-9 Understanding Seismic Anisotropy in Exploration and Exploitation: Hands On
Colorado Convention Center
700 14th St
Denver, Colorado 80202
United States

Instructor

Leon Thomsen Leon Thomsen 2021-2021 Delta Geophysics, USA

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Contacts

carolyn

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