seismic data processing 10
DESCRIPTION
ٍfrom seismic data processing course at USM MalaysiaTRANSCRIPT
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Seismic Data ProcessingMain Processing Sequence
Dr Amin KhalilSchool of Physics, USM
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Today’s Agenda
• IIR filters
And
• Main Processing Sequences
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IIR filters
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Properties of an IIR Filter• The general equation of an IIR filter can be
expressed as follows:
M
k
kk
N
k
kk
MM
NN
za
zb
zaza
zbzbbzH
1
0
11
110
1
1
ak and bk are the filter coefficients.
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Properties of an IIR Filter• The transfer function can be factorised to
give:
zXzY
pzpzpz
zzzzzzkzH
N
N
21
21
Where: z1, z2, …, zN are the zeros,
p1, p2, …, pN are the poles.
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Properties of an IIR Filter• The transfer function can be factorised to
give:
zXzY
pzpzpz
zzzzzzkzH
N
N
21
21
For the implementation of the above equation we need the difference equation:
M
kk
N
kk
k
knyaknxb
knxkhny
10
0
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Advantage
Use less memory than FIR filters
Disadvantages
•They are more susceptable to problems of finite-length arithmetic, such as
noise generated by calculations, and limit cycles. (This is a direct
consequence of feedback: when the output isn't computed perfectly and is
fed back, the imperfection can compound.)
•They are harder (slower) to implement using fixed-point arithmetic.
•They don't offer the computational advantages of FIR filters for multirate
(decimation and interpolation) applications.
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Types of filters
Matching question.
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Main Processing Squence
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Basic Processing Sequence:
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Basic Processing
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Sorting of seismic data This step describe the way we collect and view or seismic data. It consists of the following:
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CMP gather
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Common shot vs CMP gather
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Zero-Offset gather.
This type is applied such that both shots and receivers are at the same location.
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Reference for this lecture:
Drijkoningen, G. G. and Verschuur, D.J., 2003. Seismic data processing. TU Delft.
http://geodus1.ta.tudelft.nl/PrivatePages/G.G.Drijkoningen/LectureNotes/SeismicProcessing%28tg001_ta3600%29.pdf
Link
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End
Thank you