Seismic Principles and Processing- From Recorded Trace to Seismic Section
Venue: To Be Announced
|Event Date/Time: Nov 22, 2010||End Date/Time: Nov 26, 2010|
This week long course will give the learner a good understanding of both the geophysical principles that result in field recorded seismic trace data, as well as the basic geophysical data processing that takes the recording to a stacked seismic cross section.
The material covered is both theoretical and practical in describing the principles and processing of seismic data.
A set of course notes and a light lunch are included. Demonstrations and assignments will be used to enhance learning.
Who Should Attend
This course is meant for anyone in a position of acquiring, managing, processing, mapping, interpreting, or handling seismic data, and for those who assist in these positions. It is also beneficial for those who make decisions on presented information based on seismic data.
All will benefit from a greater appreciation and deeper understanding of the seismic data they work with, allowing them to better utilize the data to itâ€™s full potential.
Describe the action of stress produced by an acoustic (seismic) source, the earthâ€™s strain reaction to this stress, and how the acoustic rock properties of the earth determine the seismic stress/strain relationship.
Describe acoustic elastic strain energy (seismic) waves. Define their types, characteristics, and properties. Discuss how the seismic waveâ€™s propagation velocity is dependent on the geologyâ€™s acoustic stress/strain characteristics.
Describe how the seismic strain energy wavelets created by the source propagate through the earth, interacting or convolving with the subsurface geology, resulting in a modified version of this source wavelet arriving at the geophone to be recorded as a seismic trace.
Seismic Wave Travel
Describe the seismic wavesâ€™ amplitude, travel path, and travel time as they propagate through the earth. Discuss how the seismic shot record is a representation of the amplitude and arrival time of the seismic wave, recorded at geophones a certain distance from the source.
Seismic Data Field Recording
Describe how analog seismic waves are recorded digitally as a seismic trace, and the processes applied during the recording.
Seismic Data Field Recording Formats
Describe the layout of the recorded information using various formats.
Reformatting Field Data
Describe the reformatting of seismic field data to the formats required for seismic processing.
Survey and Geometry
Describe the acquisition configurations and the recorded survey data and how that is used to create the geometry file.
Static Time Corrections
Describe how the seismic is corrected for arrival time errors due to differences in shot and receiver elevations, and due to effects of the variable surface weathering layer.
Common MidPoint Gather
Describe the method of the common midpoint gather.
Normal Moveout and Velocity Analysis
Describe the process of velocity analysis and NMO time corrections
Stack and Migrated 2D Sections
Describe the stacking and migration process and explain the seismic information displayed on a final stack section.
Pre/Post Stack Noise Attenuation and Signal Enhancement
Discuss the basic seismic data noise attenuation and signal enhancement processes, including signal/noise identification, amplitude correction, filtering/convolution, frequency filtering, array filtering, velocity filtering, correlation, inverse filtering/deconvolution, multiple attenuation.