RokDoc Seismic Data Conditioning & Simultaneous Inversion

3 Day Course: Attendees learn to operate the software by applying it to practical examples; this is supplemented by presentations of the underlying principles and by discussion of the results obtained, with emphasis on QC methods.

The emphasis is on deterministic simultaneous inversion of multiple angle stacks to give acoustic and shear impedance, but coloured inversion of AVO intercept – gradient combinations is also included.

The course is intended for new and intermediate users of RokDoc Seismic Data Conditioning and Inversion, and will cover these topics:

  • Overview of Inversion
  • Why invert data?
  • Inversion algorithms
  • Limitations and assumptions
  • Pre-inversion seismic data conditioning
  • Workflow overview including parameter testing
  • QC of inversion results
Course Overview:
Course Learning Outcomes
Well-ties and Wavelets
  • Quantitative ties: the Roy White method
  • Estimating accuracy and goodness of fit
  • Wavelet consistency across a dataset
Well-tie example
  • Backus averaging
  • Wavelets from near, mid, far, ultrafar stacks: checking consistency
Introduction to RokDoc 3D
  • Setting up seismic and well data
  • Manipulating seismic views
Seismic Data Conditioning Example
  • Spectral balancing including QC of results
  • Time alignment: trim statics
  • Amplitude balancing: how should it be done?
Simultaneous Inversion example
  • Setting up the input data
  • Creation and QC of the low-frequency background model
  • Inversion parameter testing:
  • Background model high-cut filter
  • Model weight
  • Use all the available substacks?
  • QC: fit to well and seismic data
Making Derivative Outputs example
  • Poisson’s ratio
  • Acoustic Impedance – Poisson’s Ratio projections
  • λρ - μρ
Alternative approach: Relative Elastic Impedance
  • Principles of extended elastic impedance and chi angle projections
  • Problems of gradient calculation
Chi Angle Projections example
  • Well cross-plots
  • Seismic intercept and gradient combination
Coloured Inversion
  • Principles
  • Pros and cons versus simultaneous inversion to absolute impedances

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