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Lec(P)01_Types of Seismic Display (revision)
Transcript of Lec(P)01_Types of Seismic Display (revision)
Wiggle & Varwiggle
Common Mid Point/Depth Point (CMP/CDP)
the complete set of data that was received at one geophone (example from land data). It would be useful for studying problems arising from one particular geophone, such as incorrect damping or noise
succession of data traces which have the same offset distance between the shot point and geophone. It would use one trace per shot section and is useful give a quick look at the variations in layering along a line.
Seismic traces from the same reflecting point are gathered together (CRP gather) and summed, or 'stacked'. The more of these seismic traces we can stack together into one output trace, the clearer the seismic image. (Source: CGG Website)
displays all the data for the same reflection midpoint, often after correction for normal moveout and statics. It is the essential gather for NMO correction and stacking. This CDP gather will appear similar to a common-shotpoint gather, but should have less variability as all the traces refer to a common midpoint
For Practical (Week 1) - May 2015
SN Fathiyah Jamaludin
LEC(P)_01: SEISMIC DISPLAY
Common Receiver Gathers
Collection of data from one shot record (example from marine data)
Wiggle Depicts the positive & negative loop trace.
Show both positive & negative seismic loops, one
which is coloured in. Mostly used as it gives
better information to the interpreter on the
Source: Veeken 2007
Dual Polarity Display
One polarity is shown for all loops regardless of the positive or negative character of the loops excursions.
Dual polarity display whereby both -ve & +ve loops are plotted in the same direction (after Brown 1999)
Varwiggle display in
coloured and common in 3D Visualization.
Fig 1: colour density display of an amplitude section offshore Nigeria. The chosen color bar brings out the geological features. At 4.5s (TWT), we can observe Messinian Salt Layer acting as decollement layer for the overburden tectonics. (Image from Cope, 2003, edited from Veeken and Moerkerken 2013)
Figure 2: Selection of color scale that can be helpful in highlighting the extreme values present in the seismic section. Green (+ve) and
yelloe (-ve) coincide with extreme amplitude values. What gain interpreters' interest are the extreme values of the seismic data amplitude.
(data courtesy of DeGroot Bril, edited from Veeken and Moerkerken 2013).
Changes in scales (horizontally and vertically) at the same seismic section can be helpful in bringing out certain geo-features
Gathers (all types) and stacks can be displayed in wiggle, varwiggle or in density display
Objective: To familiarize with different types of seismic display
OBE: Meet the Course Learning Outcome (CLO) 3 to apply the state-of-art of seismic data visualization