Local stretch zeroing NMO correction

Abstract

S U M M A R YIn this paper we present a new method of normal move-out (NMO) correction called local stretch zeroing (LSZ) method that avoids NMO stretch. The method eliminates the theoretical curves that generate interpolated data samples responsible for NMO stretch. Pre-correction time sampling interval is preserved by reassigning and zero padding of true data samples. The optimum mute zone selection feature of the LSZ method eliminates all interfering reflection events at far offsets. The resulted stacked section from the LSZ method contains generally higher frequency components than a normal stack, and preserves most of the shallow reflectors. The LSZ method requires that zero-offset width of the time gate, i.e. zero-offset time difference between two adjacent reflections, be larger than the dominant period. The major shortcoming of the method occurs when CMP data are over-or under-NMO corrected. Both synthetic and real world examples show the efficiency of the LSZ method over the conventional NMO (CNMO) correction. The method loses its superiority when CMP data are over-or under-NMO corrected.

Erratum

“…This erratum corrects an error in a figure of Kazemi & Siahkoohi (2012). The image shown as panel (a) of fig.…”

Improving seismic resolution of prestack time-migrated data

“…Zhang et al (2015) showed how such corrections can improve subsequent prestack inversion to map geomechanical properties in an unconventional Fort Worth Basin, Texas, shale play. Kazemi and Siahkoohi (2012) propose an alternative method to minimize migration stretch. To avoid stretching the nonzero offset traces, the moveout correction needs to be constant for all samples that form part of a reflection event.…”

Trace‐imposed stretch correction in Kirchhoff prestack time migration

“…Many papers have presented effective methods to alleviate the NMO stretch (Dunkin and Levin ; Rupert and Chun ; Barnes ; Alkhalifah ; Dong ; Shatilo and Aminzadeh ; Brouwer ; Hilterman and Van Schuyver ; Lazaratos and Finn ; Hassan, Penny and Satish ; Kazemi and Siahkoohi ; Zhang et al. ).…”

“…Given migration stretch, the distortion is a consequence of the varying incident angle (Tygel et al 1994;Roy et al 2005). * E-mail: qiancheng.liu@kaust.edu.sa Many papers have presented effective methods to alleviate the NMO stretch (Dunkin and Levin 1973;Rupert and Chun 1975;Barnes 1992;Alkhalifah 1997;Dong 1999;Shatilo and Aminzadeh 2000;Brouwer 2002;Hilterman and Van Schuyver 2003;Lazaratos and Finn 2004;Hassan, Penny and Satish 2010;Kazemi and Siahkoohi 2012;). However, conventional NMO methods cannot image complex subsurface structures well, and thus prestack migration stands out (Yilmaz 2001).…”