Introduction to Geophysic Ali Oncel [email protected]Department of Earth Sciences KFU! Seismic Reflection 3: Acquisiton, Proc and Waveform Analysis I n t r o d u c t i o n t o G e o p h y s i c s " K F U !
Introduction to GeophysicsAli [email protected]
of Earth SciencesKFUPMSeismic Reflection 3: Acquisiton, Processing,
and Waveform AnalysisIntroduction to Geophysics-KFUPM
Previous LectureExample: Data Acquisition in Shaybah Field
(Alfaraj et al., 1998, GeoArabia, Vol. 3, No 2)Over 120 million
seismic traces and over 100,000 shot points, covering an area of
about 1,100 sq km. Primary Reflection Multiples NMO Normal Moveout
Correction Velocity Analysis Example: Gathers and NMO Corrected CMP
Mute Static Corrections Introduction to Geophysics-KFUPM
Average VelocityVav= average velocity above the interfaceZ=
depth from the surface to the interfacet= one-way travel from
surface to interfaceIntroduction to Geophysics-KFUPM
Root Mean Square (RMS) VelocityVRMS= root mean square velocity
Vi= seismic velocity of the ith layerti= two-way travel time within
the ith layerIntroduction to Geophysics-KFUPM
Interval Velocity (Vint)For n=2V1= Stacking velocity for
reflection from upper interface [VRMS(1)]V2= Stacking velocity for
reflection from lower interface [VRMS(2)]Dix, 1955 (p.130 of
Sheriff and Geldart, 1995)Vint=Z/ tVint= average velocity between
two interfaces Z= thickness of layer between the two interfacest=
one-way travel time between the two interfacesIntroduction to
Geophysics-KFUPM
Introduction to Geophysics-KFUPM
Introduction to Geophysics-KFUPM
Introduction to Geophysics-KFUPM
Introduction to Geophysics-KFUPM
Mid-Term ExamMay 3 Field-TripApril 26, 12.30 PMIntroduction to
Geophysics-KFUPM12.10 AM- 13.00 AMWe may recover two classes
time
What does fold mean in the CMP method? Give an example. What are
the two advantages of the CMP method over previous methods?
P.C: Open BookThe quiz of the weekIntroduction to
Geophysics-KFUPM
