Principles of 3D seismic interpretation and applications

Sommaire

1 – INTRODUCTIONo Course overview, course expectations, review of the historical evolution of seismic methods.
o Seismic applications in oil and gas E&P processes: from regional scale, block scale, prospect scale, to appraisal and development stages.

2 – 3D SEISMIC ACQUISITION
o Fundamentals of acoustic waves propagation
o Characteristics of main acquisition systems in marine and land domains
o Imperfections of seismic measurements and their consequence on interpretation
o Recent development in acquisition techniques, and adaptation of methods to specific problems or environments.

3 – 3D SEISMIC PROCESSING
o Description of standard processing sequence
o Migrations: post-stack and pre-stack, in time and depth domains. Interpreter’s implication.
o Anisotropic processing, and advanced processing techniques.

4 – ESSENTIAL FIRST STEPS: WELL TIE and CALIBRATION
o Initial review of seismic dataset: footprints, wavelet characterization, resolution, preliminary geological concepts.
o Seismic tie to well data in time and in depth domains. Check-shots, synthetic seismograms, VSP, anisotropy. Use of well data for seismic inversion and modeling.
o Other calibration means: use of geological knowledge and non-seismic geophysical techniques.

5 – HORIZONS AND FAULTS PICKING
o Techniques and tools for horizon and fault picking on different displays.
o Review and applications of various attributes
o Pitfalls
o Field examples and hands-on exercises

6 – STRUCTURAL AND STRATIGRAPHIC INTERPRETATION
o Structural interpretation, with emphasis on compressive and gravity tectonics.
o Seismic stratigraphy, with emphasis on deltaic environment:
o Specific environments: carbonates, salt tectonics.

7 – DEPTH CONVERSION, GRIDDING AND MAPPING
o Velocity and depth conversion: choice of model for depth conversion.
o Gridding: use of kriging method. 3D seismic map to well tie.
o Mapping

8 – DIRECT HYDROCARBON INDICATORS (DHIs)
o Fluid effects on full stack cubes: effects on polarity and amplitudes, bright spots, flat spots.
o Fluid effects according to angle (AVO): physical principle, classification of sands.
o Tools to be used: swaths, attributes on amplitudes, partial stacks, Intercept/Gradient displays
o Pitfalls: tuning effect, diagenetic effects, gas hydrates, carbonates string, “fizzy water”, etc.
o Review of examples. Quiz

9 – 3-D SEISMIC INTERPRETATION FOR RESERVOIR MANAGEMENT
o For drilling: geo-hazards, abnormal pressures prediction.
o For appraisal: delineation of accumulation, reserves estimate, relating seismic attributes to reservoir parameters, reservoir modeling, location of producers and injectors.
o For development: geosteering, 4D and time-lapse seismic monitoring.

10 – OTHER METHODS
o 3 components acquisition, processing and interpretation. Review of some application cases.
o 4D seismic
o Passive seismic for unconventional resources.

11 – SUMMARY OF 3D CASES STUDIES AROUND THE WORLD
o Review of 3D and 4D successful applications worldwide for finding hydrocarbons and enhancing petroleum recovery.
o Lessons learnt by selected historical failure cases.

Langue

Français, Anglais & Espagnol

Public visé

This course will be most beneficial to geophysicists, geologists, reservoir engineers, and drilling engineers with some experience as professionals. It can be adapted to students in the same domains.

Durée prévisionnelle

5 half days

Moyens Pédagogiques

Print-out of selected slides.

Prérequis

Objectifs

This course delivers techniques related to practical analysis and interpretation of 3D seismic. It is centered on the practice of structural and stratigraphical interpretation in various geological environments, and to the contribution of 3D seismic interpretation at different stages of exploration, appraisal and development for the enhancement of hydrocarbons recovery.

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