Discipline Geophysics
LevelSkill
Duration5 Days
Delivery Mechanism Practical Training with Software
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Design of Marine 3D Seismic Surveys using OMNI 3D®

This three or five-day hands-on training class provides students with the foundations needed to use OMNI 3D® in a full range of quality control and design tasks for offshore seismic acquisition planning from field QC and navigation to advanced design analyses. This course teaches participants how to create surveys for the different acquisition configurations, perform fold analyses, insert infilling lines, and use ray tracing and OMNI target analysis to select optimal acquisition parameters.

  • Agenda
  • Topics
  • Audience
  • Prerequisites
  • Agenda

    Day 1

    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.

    Day 2

    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.

    Day 3

    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.

    Day 4

    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.

    Day 5

    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.

  • Topics

    Concepts of 3D marine seismic survey design

    Commonly used acquisition configurations: NAZ, MAZ, WAZ, RAZ, FAZ, their advantages and disadvantages and how to lay them out in OMNI 3D®

    The creation of 2D and 3D earth models to perform ray tracing analysis, illumination and create synthetic seismic data in OMNI 3D®

    Use of the OMNI 3D® Workshop tools to analyze and select the essential offshore acquisition parameters: bin size, maximum offset, migration aperture, shot interval and fold.

  • Audience

    This class is suitable for geophysicists and geologists wanting to learn how to design marine seismic surveys with the OMNI 3D® software package.

  • Prerequisites

    A basic understanding of the seismic acquisition concepts. No prior experience with OMNI 3D® is required.

  • Prerequisites

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