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[PDF] Mode conversion noise attenuation, modelling and removal: case studies from Cyprus and Egypt
Author: Jyoti Kumar, Marcus Bell, Mamdouh Salem, Tony Martin, Stuart Fairhead
First Break - 3 December 2018The authors propose a method to attenuate converted mode energy to improve the imaging for prospective sub-salt targets.
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[PDF] Increased resolution and penetration from a towed dual-sensor streamer
Author: David Carlson, Andrew Long, Walter Söllner, Hocine Tabti, Rune Tenghamn, Nils Lunde
First Break - 1 December 2007The authors discuss the theory behind a towed dual-sensor (GeoStreamer)developed by PGS to operate at deeper depths and deliver deghosted data.
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[PDF] Offshore Ivory Coast: Reducing Exploration Risk
Author: Patrick Coole, Matthew Tyrrell, Christine Roche
GEO ExPro - 1 October 2015In 1996 PGS acquired a 1,600 km2 3D survey over blocks CI-104, 515, 115 and 116. This survey has now been through reprocessing using a broadband processing workflow and reinterpreted by PGS. Here we present an introduction to the petroleum geology of Ivory Coast and discuss the results of the interpretation project.
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[PDF] Santos Vision: Innovative Seismic Data Processing in a Super Giant Oil Basin
Author: Hermann Lebit, Sriram Arasanipalai, Jeff Tilton, Pascal Ollagnon
GeoExpro - 1 May 2019PGS has rejuvenated its Santos portfolio and final products from the reprocessing effort are available now. Covering around 34,000 km2, the Santos Vision program delivers the most comprehensive and geologically conformable dataset to date, mitigating exploration risk in the prolific pre-salt play of the basin. The latest in broadband processing has been applied and the single data volume represents the largest Reverse Time Migration (RTM) and Kirchhoff prestack depth migration (KPSDM) successfully completed by the industry.Extension of the dataset to more than 60,000 km2 of full and seamless coverage is in progress. The recent application of PGS Least-Squares Migration (LSM) to a subset of the seismic data demonstrates a further uplift in image resolution that provides unprecedented resolution in post- and pre-salt imaging.
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[PDF] MegaSurvey Key to Understanding Prospectivity
Author: Øystein Lie, Jörn Fürstenau, John Comstock
GEO ExPro - 1 June 2013The Ministry of Energy and Water of the Republic of Lebanon opened their first bid round on 2 May 2013 with a closing date of 4 November 2013. Twelve companies qualified as operators and 34 as non-operators and bids with consortiums of a minimum of 3 companies are invited.
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[PDF] North Sea case study: Heavy oil reservoir characterization from integrated analysis of Towed Streamer EM and dual-sensor seismic data
Author: Zhijun Du, Kerry Key
ASEG - 15 February 2015Integrated analysis of geophysical data can provide valuable information on reservoir properties, on the basis of which exploration, appraisal, and development decisions can be made. Hence, we have introduced a quantitative interpretation workflow that integrates dual-sensor seismic and Towed Streamer controlled-source electromagnetic (CSEM) data. The workflow was designed to facilitate a reliable extraction of the complementary information from the two datasets. The seismic contribution starts with a depth-converted sparse horizon model to initialize the EM inversion, but it is not placed rigidly. This makes good sense when taking into account the uncertainties in seismic data, in the time to depth conversion, and more importantly, the fact that a reservoir can be hydrocarbon-charged to an unknown degree corresponding to the spill-point or less. We show how this approach enables a robust and reliable workflow for integrating EM and 3D seismic data with data examples acquired in an area with the complex geology of the Bressay, Bentley and Kraken (BBK) fields in the North Sea. The three heavy oil reservoirs are injectites, located in close proximity to other high resistivity settings, such as the shallow gas in the overburden, regional Balder Tuff and granite intrusions, resulting in challenging imaging issues.
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[PDF] Towed Streamer EM – reliable recovery of sub-surface resistivity
Author: Allan McKay, Johan Mattsson, Zhijun Du
First Break - 1 April 2015The authors present a seismically guided inversion and illustrate the workflow of the data integration, which remains driven purely by the seismic and EM data.
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[PDF] Solving imaging challenges in a deep-water, complex ooze regime: a case study from the Outer Vøring area, Norwegian Sea
Author: Sören Naumann, Øystein Korsmo, Grunde Rønholt
First Break - 1 June 2018 -
[PDF] Efficient broadband LS-WEM
Author: Shaoping Lu, Xiang Li, Alejandro Valenciano, Nizar Chemingui, Cheng Cheng
E&P Daily News - 14 June 2017A new methodology for LS-WEM is much less compute-intense.
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[PDF] Making the Transition from Discrete Shot Records to Continuous Wavefields – Real Data Application
Author: Tilman Klüver, Stian Hegna, Jostein Lima
EAGE - 4 June 2018In this paper, we present real data applications of the acquisition and processing method outlined in the companion paper (Hegna, S., Klüver, T., and Lima J., 2018, Making the transition from discrete shot records to continuous
wavefields – Methodology: Expanded abstract submitted to the EAGE annual meeting). We discuss the design of sources that emit continuous wavefields approaching the properties of white noise using air-guns. The design
minimizes correlation between sources and allows a six-source configuration with a vessel towing six strings of airguns, thereby increasing efficiency or cross-line sampling. The environmental benefit of spreading source energy in time will be demonstrated. We illustrate the processing method based on continuous source and receiver wavefields on seismic data acquired on top of data acquired previously based on discrete shot records. Both data sets will be compared at image level.