Broad-bandwidth data processing of conventional marine streamer data: An offshore West Africa field case study

Abstract

The bandwidth of conventional marine streamer seismic data (i.e., that collected with a streamer comprising hydrophones only) is generally limited at both high and low frequencies by the presence of both source and receiver ghost notches. Recently, a method was introduced that uses non-linear optimization to derive a stable operator which, when applied to conventional marine streamer seismic data, recovers much of the signal present in the recorded data that is weakened by the presence of the ghosts at the notch frequencies. In this paper, we present a case study of the use of such a method to derive a broadband image from conventionally acquired data from offshore West Africa.

Risk Reduction on the Ivory Prospect via Geologically Constrained Non-parametric Inversion and Bayesian Uncertainty Estimation on a Fault-bounded Reservoir

“…The deep water environment allowed for a cascaded 3D and 2D SRME demultiple approach to target free surface multiples which dominated the target depth and deeper section. Deghosting was applied to suppress side-lobes and boost low frequency content within the data along with increasing the useable bandwidth from 5-95 Hz to 2.5-110 Hz (O'Driscoll et al, 2013, Zhou et al, 2012. Figure 1 compares a stack before and after de-ghosting, whilst figure 2 compares spectra of the corresponding migrated data, and also after application of attenuation (Q) compensation.…”

Multi survey matching of marine towed streamer data using a broadband workflow: a shallow water offshore Gabon case study

“…Here we use a processing solution capable of removing source and receiver ghost components from the two flat streamer datasets. The methodology we employ (Zhou 2012, O'Driscoll, 2013 de-ghosts the data prior to migration by generating a stable, data-derived operator.…”

Reprocessing 2-D airgun seismic reflection data SALTFLU (salt deformation and sub-salt fluid circulation in the Algero-Balearic abyssal plain) in the Balearic promontory and the Algerian basin

“…Here, the GI-guns were operated in harmonic mode, where generator and injector volumes are equal, thereby reducing the bubble oscillation, without completely suppressing it (Landrø 1992;Dondurur 2018). The data bandwidth is principally widened by performing a source designature, whereby the primary airgun impulse and the bubble pulse are collapsed into a sharp, zero-phase wavelet (Sheriff and Geldart 1995;Amundsen and Zhou 2013;ten Kroode et al 2013;Baldock et al 2013;O'Driscoll et al 2013). Deterministic deconvolution, where the operator is designed using an estimated source wavelet, can yield geological imaging superior to traditional statistical deconvolution methods, particularly for recovery of low frequencies and the preservation of amplitude information (Yilmaz 2001;Sargent et al 2011;Scholtz et al 2015;Davison and Poole 2015).…”