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On top of the spread

Oilfield Technology, September, 2018
Jo Firth | Vetle Vinje
©2018 Palladian Publications Ltd

In order to solve the challenges of imaging the shallow reservoirs of the Barents Sea, CGG, in collaboration with Lundin Norway, have developed an innovative source-over-spread acquisition solution, known as TopSeis. This addresses the lack of near-offset data recorded in conventional towed-streamer acquisition by enabling recording of short and zero-offset data with a split spread, significantly increasing the illumination density of the subsurface. This article looks at the development of this technique with some recent results, including AVO.

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Seismic characterization and porosity workflow to support geological model update: a case study from presalt carbonate reservoir, Brazil

First Break, September, 2018
©2018 EAGE

In this paper, we present an integrated study that combines geophysical and geological approaches to perform porosity estimation and populate the reservoir geological model with the estimated property. For pre-salt oilfields, due to the complex porosity distribution in carbonate reservoirs, predicting a reliable porosity is a fundamental step for reservoir modeling.

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A Log Based Method of Determining Dynamic Biot’s Coefficient

Hart's E & P, August, 2018
Reza Saberi | Fred Jenson
©2018 Hart Energy

This study uses multiple wells with high-quality acoustic and density logs to demonstrate a rock physics workflow for determining dynamic Biots’s coefficient from detailed petrophysical evaluation. One of the important inputs needed for determining dynamic Biots’s coefficient is a detailed interpretation of the rock which has been modeled in this study with a generic stochastic method. In this analysis saturated bulk modulus (Ksat) is assumed to be very close to dry bulk modulus (Kdry) which in unconventional reservoirs, because of the very low porosity, is reasonable. This condition, furthermore, is verified during analysis of the well log curve data.

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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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