Technical Content

Surface-related multiple elimination (SRME) is an effective and widely used tool for the attenuation of multiple energy in marine seismic data. However, removing multiples with SRME is still challenging in geologically complex areas, and we often observe residual multiples in such settings. Residual multiples ...

Brazilian pre-salt often exhibits geologically complex settings with many challenges for oil and gas exploration and production. One of these key challenges is the presence of igneous rocks. We analyze the ability of full-waveform inversion (FWI) to identify and detect this class of rock ...

Full waveform inversion (FWI) is becoming an increasingly dominant force in velocity model building and seismic imaging, often providing us with unrivaled focusing and resolution of the subsurface image. The superior velocity models and seismic images achieved through FWI also enable serious and more ...

Land seismic data in the Sultanate of Oman presents more and different challenges for full-waveform inversion (FWI) compared to marine data. This is mainly due to complex near-surface effects that create strong ground roll, which obscures already poor data quality, especially at lower frequencies ...

Full-waveform inversion (FWI) has demonstrated tremendous potential to provide high-resolution subsurface models. However, obtaining an accurate FWI velocity model can still be challenging in steep continental slope shelf geologic environments. The uncertainties, often caused by shallow abrupt velocity contrasts, limited diving-wave penetration depth, and ...

Historically, Brazilian pre-salt fields have been imaged by narrow-azimuth towed-streamer (NATS) data. More recently, ocean bottom node (OBN) acquisitions have been employed to image and monitor already producing fields. In cases as such, 4D seismic monitoring is only possible via NATS/OBN hybrid pairs, where ...

We present a means to estimate porosity and permeability at cm-scale resolution using whole-core computed tomography (CT) scans. We focus on carbonate reservoir intervals of the Buah Formation and Khufai Formation, both part of the Precambrian Nafun Group, from two wells located onshore Oman ...

Marine vibrator sources offer the ability to emit a fully customisable and accurately repeatable sweep signature. Resulting peak amplitude levels are much lower than for airguns, making marine vibrators potentially preferable for the welfare of marine life. While the highly repeatable nature of the ...

We present the use of elastic full waveform inversion (FWI) of surface waves to create a detailed shear velocity model of the near surface in the Middle East, where the shallow geology features strong velocity contrasts, making traditional velocity model building techniques challenging. The ...