FUNDAMENTALS OF SEISMIC ACQUISITION AND PROCESSING

Synthesis

Day 1 : A – Fundamentals of seismic reflectiono Principles of seismic methodso Wavefront at an interface
o Propagation in stratified medium
o Diffracted waves

B – Principles of 2-D technique
o Acquisition environments
o Principle of land acquisition
o Field lay-outs
o Anatomy of a shotpoint
o Concept of CMP
o Fold of coverage

Day 2 : C – Land operation
o Mobilisation of the field unit
o Audits
o Field operations
o Demobilisation

D – Main land seismic sources
o Acquisition equipment
o Vibrators
o Explosives

Day 3 : E – Line equipment
o Cable and cableless surveys
o 1C and 3C Geophones
o Cables and boxes
o Recording instrument
o Radio equipment

F – 3-D Technique
o Why 3-D
o Geometrical parameters
o Operations parameters
o Fold of coverage
o 3-D data
o 3-D areas to be considered

Day 4 : G – Convolutional model of the earth
o Attributes of seismic data
o Geological model
o Genesis of a seismic trace
o General expression of seismic trace

H – Deconvolution
o Purposes of deconvolution
o Deconvolution in practice
o Classes of deconvolution
o Spiking deconvolution
o Predictive deconvolution
o Zero-phase deconvolution
o Results of deconvolution

Day 5 : I – Velocity analysis and stacking
o Seismic velocity
o NMO correction
o Velocity analysis in practice
o RMS velocity
o NMO velocity
o Dix formulae
o Result of stacking

J – Seismic imaging
o Migration principles
o Horizontal and vertical displacements
o Migration considerations
o Migration selection
o Migration results

At the end of the course a one-hour exam is performed on the form of multiple choices question and course-related exercises

Language

English

Audience type

Junior geophysicists who want to refresh their seismic knowledge- Geologists who want to know where seismic data, they interpret, came from – Petroleum Engineers who want to know what the seismic technique can bring to their day by day work, bachelors and first year of master students and petroleum engineering schools

Planned duration

Recommended duration 5 days of 4 hours a day. However, the course can be shortened to 3 days if needed

Support material

Print-out of selected slides with four slides per pageNo digital files will be provided

Prerequisite

No particular prerequisites are necessary.However, it is recommended to have some general knowledge on wave propagation

Objectives

After the course, attendees will be able to analyse shot data in land and marine environments, to understand field operations of seismic surveys, to differentiate between 2-D and 3-D surveys, to evaluate the mathematical concepts of the seismic trace, to describe main steps of seismic data processing leading to migrated 2-D seismic lines and 3-D volumes.

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