Multicomponent Processing

Audience

Geophysicists with 3D processing knowledge embarking on multicomponent processing.

Content

The course begins with an overview of ocean bottom seismic (OBS) acquisition. Sensor deployment, their sensitivities and particularities are clarified and geometry visualised.

The concept of orientation is explained. Practical exercises enable hodogram visualisation and understanding, component reorientation, polarity analysis and quality control.

The dual sensor summation theory is explored. The ghost and pegleg travel-paths are described plus the means of addressing the receiver ghost via PZ summation. Practically, PZ summation is carried out.

Briefly the other key steps of PP processing are introduced. Converted waves are discussed together with their characteristics and benefits for lithological discrimination. PS workflow processing considerations are explained and the incorporation of PP information. Radial and Traverse coordinates are clarified with discussion of the two possible processing flows, isotropic and anisotropic. PS statics, binning and creation of a QC stack are explained. The various gamma terms are expounded throughout the process. The main topics covered are:

• Ocean bottom seismic acquisition, focusing on ocean bottom cable (OBC); 4 component (4C)
• PP/PS, mode conversion, polarization, hodograms and particle motion
• Vector fidelity, field orientation, reorientation and QC
• PZ summation methodology
• Introduction to key PZ processing steps, source deghosting, demultiple and statics
• Understand converted waves, their characteristics and benefits
• Processing considerations, statics, binning and ACCP/CCP
• PS Processing flow, ACCP stack, gamma, ?0, ?NMO, ?0 vertical and deriving the gamma
• Anisotropic, types, birefringence, fracture and S wave splitting, SI/S2 detection and layer stripping in azimuth anistropy analysis
• QC migration and the notion of ?effivtive

Learning Objectives

• Explain the specificities of OBS acquisition
• Understand vector fidelity
• Be able to perform PZ summation
• Understand what converted waves are and list their characteristics
• Be familiar with PS processing and able to describe the processes within the sequence
• Understand ?0, ?NMO,?0 vertical, ?effivtive, how to derive
• Be capable of using the Vector Vista applications for processing

Duration

4 days

Number of Participants

12

Prerequisites

Participants should have a geophysical background and good proficiency in seismic processing.

Software Used

Geovation

Course Format

Classroom, presentations, exercises

Find Out More

CGG GeoTraining offers the most comprehensive industry training based on years of practical experience acquired by our personnel.

Our proprietary courses are fully customizable and can be offered at a time and location convenient to you. Please request a course for more information.