Page 287 - Acquisition and Processing of Marine Seismic Data
P. 287
278 5. PREPROCESSING
shallow amplitudes are suppressed while the dee- are less suppressed while the amplitudes of late
per amplitudes are boosted for larger P values. As arrivals are insufficiently amplified. Figs. 5.38
P
P
thePvaluedecreases,theeffectivenessofthet cor- and 5.39 show two applications of the t correction
rection also decreases: amplitudes of early arrivals for different P values on two different marine shot
P
P
FIG. 5.37 t gain for different P values. The efficiency of t correction depends on P value.
P
FIG. 5.38 t corrections for different P values on a marine shot gather from relatively shallow waters. (A) Filtered shot with
P
no gain, and its t corrected versions for (B) P ¼ 0.5, (C) P ¼ 1.0, (D) P ¼ 2.0, (E) P ¼ 3.0, and (F) P ¼ 4.0.
