Design of Marine 3D Seismic Surveys using OMNI 3D®

Basic Marine Survey Design Concepts and the Most Common Acquisition Configurations

• Brief introduction: interface and project tree description

• Project management

• NAZ (narrow azimuth towed streamer surveys)

• Fold plots: subsurface fold, unique fold, effective fold, cube of fold with depth

• Offset distribution plots

• Azimuth distribution plots

• WAZ (wide azimuth towed streamer surveys)

• MAZ (multi azimuth towed streamer surveys)

• RAZ (rich azimuth towed streamer surveys)

• FAZ (full azimuth towed streamer surveys, single and dual coil)

At the end of this session the student will be able to explain parallel, orthogonal, areal and random acquisition geometries, describe the essential acquisition parameters and how to select them. They will be able to use the different elements of the OMNI 3D® interface to create and edit NAZ, MAZ, WAZ, RAZ and FAZ geometries.

Production Tools and 2D Ray Tracing and Wave Equation Modelling

• P190 files

• Obstacles, editing source locations

• Undershooting

• Boundaries

• Plot tab: tools to create images for reports

• Reports

• Status files

• 2D ray tracing modeling

• 2D Wave equation modeling

At the end of this session the student will be able to import and export streamer surveys in P190 format and insert an infill line into a streamer survey. They will be able to create a layout survey inside a given boundary and create images and reports. They will be able to use the Status tool to automatically update plots with newly acquired data, create 2D earth models for 2D ray tracing and wave equation modelling and be able to explain how to use the ray traced and wave equation analysis and synthetics for acquisition parameter estimation.

3D Ray Tracing and Target Analysis

• Target analyses: migration aperture, resolution, maximum offset, etc.

• 3D bin grid velocity models analyses

• 3D ray tracing model

• Illumination

• Footprint

• PSTM response

• Fresnel Zone

• AVO

At the end of this session the student will be able to create a 3D earth model with OMNI 3D®. They will be able to use this model to perform target analysis and create 3D synthetics using ray tracing. They will be able to perform target illumination and use OMNI 3D® Workshop analysis tools to predict footprint, PSTM response and AVO responses for a given streamer survey.

Optional Topics

• OBS (Ocean bottom cable and/or nodes) (optional, at client request)

• VSP (Vertical Seismic Profiles) (optional, at client request)

• 4D (Time-lapse)(optional, at client request)

At the end of this session the student will be able to use the OMNI 3D® tools for OBS, VSP and time lapse surveys.

Optional Workshop to Review Client Marine Seismic Acquisition Challenges

• Workshop on seismic acquisition challenges (It is recommended for the sake of efficiency that the client provides some information in advance about the topics they wish to cover in this workshop as well as relevant images, maps, navigation files, interpreted horizons, velocity models, well logs, etc.)

This session provides the opportunity for the client to investigate and discuss some of their own data and challenges.