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Hoy A.,Total E and P UK
Society of Petroleum Engineers - SPE/APPEA Int. Conference on Health, Safety and Environment in Oil and Gas Exploration and Production 2012: Protecting People and the Environment - Evolving Challenges | Year: 2012

The Shetland Gas Plant (SGP) is being constructed as part of the Total E&P UK operated Laggan-Tormoregas condensate development, locatedto the west of the Shetland Islands. One of the first challenges was the extensive peat covering the onshore site. Total is committed to site restoration at the end of the plant's operating life and the peat has been excavated and stored on site for site restitution. This was considered the best practicable environmental option. The priority has been to ensure the peat remains saturated so that anaerobic conditions are maintained and the peat degradation is minimised. This extended abstract reviews the peat management process: planning, construction of the peat storage, peat handling, and the regulatory requirements for storage and long term monitoring at the site. Copyright 2012, SPE/APPEA International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production.

Mathieu J.P.,Total E and P UK
74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources | Year: 2012

The Halten Terrace offshore Norway is a prolific but mature petroleum province. It is mostly a Jurassic play basin with conventional tilted blocks and salt induced features. The search for remaining hydrocarbons relies on new concepts and technologies. Seismic imaging is one of the critical tools to unravel complex or subtle traps. Total Norge has a 100% interest in blocks 6406/7 & 8. The main prospect (Phoenix) is a truncation trap updip from well 6406/8-1. It is associated to a large closure at BCU level, often a favorable factor for trapping hydrocarbons. Main objectives are the Lower to Middle Jurassic shoreface reservoirs of the Ile and Tilje formations. Additional plays are evaluated at Upper Jurassic and Lower Cretaceous levels. A 3D seismic dataset was reprocessed through time and depth workflows. As a result, seismic imaging has been substantially improved. This improvement is seen also pre-stack and will enable to investigate attributes such as AVO. An integration of regional basin modeling and pressure cells study enabled to assess sourcing and seal issues. This information together with a quality seismic dataset led to an improved evaluation of risks and stakes for this large prospective structure.

Blanchard T.D.,Total E and P UK
74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources | Year: 2012

Separation of pressure and saturation changes from 4D Amplitude information is becoming more common. Current practice requires elastic properties to be estimated independently from amplitude information (AVO) with few constraints, and pressure and saturation to be estimated from these elastic parameters. We show that inherent uncertainties in the inversion for elastic parameters from 4D AVO data can be very poorly determined, potentially leading to the inability to detect changes in pressure and saturation. Using a calibrated poro-elastic model, we show that pressure changes produce elastic parameters that are poorly determined in the 4D AVO inversion, highlighting the need for using additional constraints in AVO inversion such as the time-shift.

Xu Y.,Total E and P UK Ltd | Thore P.,Total E and P UK | Duplantier O.,Total E and P UK Ltd
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

In this paper we present a new inversion scheme the "3D Propagation". We have applied it to a synthetic model composed of thin layers compared to seismic bandwidth. The synthetics have been created in order to mimic the behavior of a thin bed clastic reservoir from the West Shetland. The synthetic test shows that most of the thin bed boundaries as well as property values are accurately resolved by 3D propagation inversion. For comparison, a conventional deterministic inversion is conducted on the synthetic data. It also achieves a good job when a relatively accurate low frequency model is provided. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved.

Chao G.E.,Total E and P UK
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

In this work we present a comparison of two AVAz inversion methodologies for seismic characterization of fractured reservoirs, one based on Ruger's approximation and a second one based on the singular value decomposition of AVAz data by Varela and coauthors. The comparison is performed in a pilot case study using a patch covering 33 square kilometers from a 3D AVAz seismic dataset. The studied reservoir is a gas sand reservoir. The studied area is centered at a well location where image logs revealed the existence of almost vertical open fractures with a high fracture density. The fracture density distribution obtained through the model-based SVD inversion allowed characterising an area of high fracture density in the vicinity of the well located in the centre of the studied survey. These results are consistent with existing FMI log data. The outcome of this study also indicates that the high degree of anisotropy induced by the fractures cannot be described by Ruger's approximation. The analysis at two markers above the fractured reservoir showed that the fracture density distribution is significantly different than at the top of the fractured target. Therefore, footprint acquisition effects do not seem to influence the fracture density results.

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