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A Practical Introduction to Seismic InversionNautilus
A Practical Introduction to Seismic Inversion - training course
This practical course explains the principles and practice of inversion of seismic reflection data to yield a variety of volume properties and suggests how these results may be used. It illustrates potential benefits of seismic inversion but recognises the inherent non-uniqueness in the process and the various ways of handling both this and the information, low frequency especially, that is missing in the seismic data.
Suitability - Who should attend?
Outcome / Qualification etc.
Training Course Content
- Principles of standard inversion
Relationship with forward modelling, non-uniqueness. Seismic inversion as just one application of inversion principles. Single volume and multi-volume inversions. Use of inversion products including estimation of reservoir properties such as porosity, net/gross and saturation.
- Basic Log QC and Upscaling
Basics of P and S wave sonic, density, and other relevant logs and their limitations. Use of log transforms for QC and to replace missing data. Principles of fluid substitution and synthetic modelling for feasibility study. Importance of upscaling from log to seismic resolution.
- Seismic QC and Conditioning
Critical issues with the seismic data that is input to inversion, including bandwidth, relative amplitude fidelity, stability of the wavelet in depth/time and space. Requirements for careful acquisition and processing/reprocessing. Recent advances. How to recognise when inversion is not appropriate.
- Well Ties, Zero Phasing and Wavelet Estimation
The process of matching seismic to well data, including the recognition of reasons why they may not match. Methods of estimating the phase of the data and bringing the data to zero phase when needed. Methods of wavelet estimation including statistical and deterministic methods and error estimation. Analysis of results in terms of time shifts, phase shifts and amplitude scalars.
- Acoustic Impedance Inversion
The missing low (and high) frequency information and approaches to replacing this; relative vs Absolute Inversion. Sensitivity to phase and amplitude of the input data. Hierarchy of methods from trace integration and Coloured Inversion through model based and GLI methods. Validity (or otherwise) of typical seismic data used in the process.
- Multi-Offset Inversion
Inversion of non-zero-offset data for volume attributes including Poisson’s Ratio, Shear Impedance, Lambda-Rho and Mu-Rho. Different approaches including angle stack inversion, intercept-gradient inversion and ‘simultaneous inversion’. Advantages and disadvantages of each approach. Difficulties with inversion for density. Concepts of ‘Elastic Impedance’ and ‘Extended Elastic Impedance’ and relationship to rock properties. Fluid and Lithology volumes; EEI “tuning”.
- Extensions of Deterministic Inversions
Discussions of inversion of 4D seismic data and joint PP and PS inversion.
- Stochastic and Probabilistic Seismic Inversion
The problems of a) non-uniqueness, b) missing high frequency information and c) low frequency model building. Stochastic inversion as a tool to tackle these issues and provide valuable uncertainty estimates to augment the inversion results. Direct inversion for reservoir properties such as porosity, water saturation, net/gross etc, with uncertainty estimates using Probabilistic Seismic Inversion.
- Pitfalls and Best Practice
Practical examples of pitfalls if assumptions and/or data quality is not well understood. Non-unique nature of the process and ways to capture and characterise this. Suggestions for best practice.
- How to get the best out of an inversion project
Practical advice on how to manage a seismic inversion project, including: conducting and evaluating a feasibility study, managing the work using specialists and specialist software, quality control and interpretation of the results.
The cost of this training course is GBP 2572 per delegate.
Nautilus can also deliver this training course on an in-house basis, helping your staff achieve their professional development goals. With a customised, In-House Training solution, you can tailor the course content to individual company requirements by incorporating your data, your software, or specific case studies.
Over the past 17 years Nautilus has developed a portfolio of world-class training courses for professionals in the energy industry. Acquired by the RPS Group in March 2011, Nautilus is now part of the Energy division of RPS. Starting from six...