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This course examines in detail the practice of 3D seismic interpretation with the objective of improving the skills and productivity of subsurface professionals. It advocates an integrated approach and work plans tailored to meet project objectives. The workflow involves understanding the available data, defining subsurface geometries, inferring geological meaning, hydrocarbon presence and volumes and communicating results, including risk and uncertainty.
This is a four-day classroom course comprising a mixture of lectures, case studies and classroom exercises.
Practicing geoscientists and experienced subsurface professionals from other disciplines who wish to improve their seismic interpretation skills and productivity.
Participants will learn to:
Seismic interpretation is the process of integrating subsurface data and geologic knowledge to produce a suite of technical products and presentation materials that addresses specific objectives and informs specific decisions. This may involve developing a regional or basin-scale understanding of petroleum systems and play fairways, identifying specific leads and prospects, defining drilling locations for exploration, appraisal or development wells, estimating risk and calculating reserves.While each project workflow must be unique and fit-for-purpose and often involves multiple iterations and refinements, the process can be broken down into a series of generic steps:
Each step in this process may involve specialists, such as seismic processors, rock physicists, petrophysicists and sequence stratigraphers. However, it is typically the job of the interpreter to understand and incorporate the results of specialists, to drive the entire process towards coherent conclusions and to communicate the results and uncertainty effectively.
The step-wise approach and its iteration. Defining objectives. Workflows to achieve objectives quickly and efficiently. Thinking creatively.
Seismic data volumes
Theory and definition of stack volumes and attributes in use in the industry. Angle-stacks, coherence, AVO attributes, AI and EI inversion. Time domain vs depth domain. Recognising and understanding the differences and value of each of these. How to load and use multiple volumes most effectively. Frequency, phase and time shifts. Use of gathers.
Project objectives. Understanding client, manager and/or partner objectives. Appropriate pick density. When to pick and when to grid. Good work-habits: rigorous and meaningful naming conventions, capturing and recording work in real time. Making maps suitable for your audience. Use of 3D displays. Depth conversion procedures, quality control and error quantification.
Acquisition noise: the acquisition footprint, sources of processing noise. Geological “noise”: multiples, including water bottom multiples, the effects of shallow channels and seabed variability on amplitude and depth conversion. Gas effects, fault shadows, velocity push down and pull-up.
Recognition and classification of seismic anomalies. Recognition and interpretation of phase changes. Developing and carrying alternative models. Techniques for highlighting models. Pitfalls: surface/shallow effects, focusing, anisotropy, facies variation, high and low angle faulting. Techniques for identifying anomalies quickly. Physics-based risking.
Interval maps; isopachs and amplitudes. Defining pinchouts. Recognising and mapping sedimentary features. Chronostratigraphy vs. lithostratigraphy. Differential compaction. The art of the well tie. Resolution, detection and tuning.
Data and interpretation display
Frequency analysis, filtering and noise reduction techniques. Colour bars suited to various seismic attributes (instantaneous amplitude, average energy etc). Scales and scaling. Contouring. Voxel picking techniques. Review of specialist software. Slicing datasets. Opacity displays. Surface drape. Shaded relief.
The cost of this training course is USD 2993 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...
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