8/11/2019 207955295 Lecture 10 Sesmic Data Processing http://slidepdf.com/reader/full/207955295-lecture-10-sesmic-data-processing 1/13 Subject 10: Seismic Data ProcessingLecturer: Dr. Bakhtiar Q. AzizObjective : This subject is very important for BSc student so 4 hours are specified to give the students an obvious look out about the digital sequence of essential and optional processing. They take a flow chart of processing step by step, each processing is clarify and illustrated by diagram. Then the students will practice on which optional data is necessary for certain cases. Scientific contents 1- Flow chart of essential data processing. 1- Flow chart of optional data processing. 3-Common depth point. References 1.Applied and environmental geophysics, 1999, Sharma,V.,P. 2.Introduction to geophysical prospecting, 1988, Durbin, M. B.3.www.Geophysics.net 4.www.seismicexploration.net/
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8/11/2019 207955295 Lecture 10 Sesmic Data Processing
Objective: This subject is very important for BSc student so 4 hours are specified
to give the students an obvious look out about the digital sequence of essential andoptional processing. They take a flow chart of processing step by step, each processing is clarify and illustrated by diagram.Then the students will practice on which optional data is necessary for certaincases.
Scientific contents
1- Flow chart of essential data processing.
1- Flow chart of optional data processing.
3-Common depth point.
References
1. Applied and environmental geophysics, 1999, Sharma,V.,P.
2.
Introduction to geophysical prospecting, 1988, Durbin, M. B.
3. www.Geophysics.net
4. www.seismicexploration.net/
8/11/2019 207955295 Lecture 10 Sesmic Data Processing
CDP-Gather: After missing all unwanted data, all traces that return to one commondepth point are gathered together to examine the process of data editing
S S
S
54
CDP
S SS
321
6
1 2 3 4 5 6
Data Editing CDP-Gather
1 3 6
Muting:It is a kind of data editing by which the non-reflection events are removed, such as:1- First part of traces which contained usually refracted data, it is alsocalled (first break suppression).
2- directed waves.
Direct andRefracted events
Muting
8/11/2019 207955295 Lecture 10 Sesmic Data Processing
Deconvolution:It is similar to TAR , but here we compensate for the loss of frequency components.This loss is caused by the effect of the earth materials that act as a filter for high
Frequency.Deconvolution also defined as a process by which we restore the observed reflectionSignal to the original form.
SP G
Frequency = 10 KHZ Frequency = 0.10 KHZ
Trace equalazation:It is a process involves the adjacent of the gain of various channels so that their Amplitudes are comparable.
8/11/2019 207955295 Lecture 10 Sesmic Data Processing
Migration:It is a process that restore the reflettion events to their proper position, it is appliedIn the following cases:1- When the dip is large.2- When there is a syncline.
Bow-Tie feature
Before migration After migration
8/11/2019 207955295 Lecture 10 Sesmic Data Processing