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Unlocking Gas Reserves in Bypassed Stratigraphic Traps in a Deep-water Brownfield using Prestack Seismic Inversion, A Case Study Offshore Nile Delta, Egypt

The Leading Edge, July, 2018
Mohammed Ibrahim | Hamed Z. El-Mowafy | Dallas B. Dunlap
©2018 SEG

In deep-water depositional systems such as the slope canyon-turbidite channel system encountered on the continental slope, offshore West Nile Delta Basin, deterministic prestack seismic inversion followed by facies classification delineated thick-bedded and thin-bedded gas-sand reservoirs encased in bypassed stratigraphic traps and also delineated prospective areas for development.

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Geologically-consistent multiphysics imaging of the Darajat geothermal steam field

First Break, June, 2018
Wolfgang Soyer | Randall Mackie | Stephen Hallinan | Alice Pavesi | Gregg Nordquist | Aquardi Suminar | Rindu Intani and Chris Nelson
©2018 EAGE

This paper presents joint 3D MT, gravity, and MEQ tomography inversions at the Darajat geothermal filed, in Java, Indonesia, using cross-gradients to link the different geophysical properties. An additional structural constraint is provided via cross-gradients to the current geological porosity model for the field. The intention is to include this manuscript in the First Break special edition "Energy, Technology, Sustainability” in June 2018.

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ReGenerating the Gippsland Basin

PESA News, May, 2018
Jo Firth | Kai Zhao | Sergey Birdus | Nigel Mudge | Joe Zhou

The Gippsland Basin in South-Eastern Australia has been producing hydrocarbons since the early 1960’s when several giant oil and gas fields were discovered. It can therefore be considered to be a mature area, where production rates have been declining for the last twenty years and, with diminishing reserves, new reservoirs are being sought to meet the energy supply needs in this region. Since the initial discoveries there has been limited seismic exploration in this area and recent developments in broadband imaging technology, tomography and Full-Waveform Inversion mean that the existing data sets can be significantly improved by reprocessing to help to regenerate this basin.

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Structurally oriented coherent noise filtering

First Break, May, 2018
Geoffrey Dorn
©2018 EAGE

All seismic data, whether 2D, 3D, post-stack or pre-stack contains noise. Typically, this noise is comprised of both coherent and random components. Coherent noise presents itself as regular patterns in the seismic data. It may appear to be random or coherent depending on the orientation of the slice on which it is being observed. For example, coherent noise associated with acquisition may appear random on vertical slices through the volume, with its coherent nature becoming apparent on horizontal slices through the volume.

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Imaging challenges and processing solution in the Brazilian Equatorial margin: a case study in the Barreirinhas basin

The Leading Edge, April, 2018
Karine Pereira | Yamen Belhassen | Erick Tomaz | Sonia Domont | Diego Carotti
©2018 SEG

Barreirinhas basin is located in the north-east of Brazil and is part of the Brazilian equatorial margin, a new exploration frontier with complex geology. This basin is characterized by a rugose water bottom, a fast carbonate platform, shallow gas pockets and a complex channel network. All these elements represent a big challenge for the velocity model building and the imaging of the depositional system. From the pre-processing to the final imaging, high-end technologies were required to meet the processing objectives: 3D de-signature and 3D de-ghost, dip-constrained tomography and FWI, Q tomography and Q-PSDM.

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