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Collaborating Authors
Stø Formation
Summary Marine controlled source electromagnetic (MCSEM) surveys have become an important part of offshore petroleum exploration. However, there exist very near-shore areas, with the depth varying from tens of meters to a few hundred meters, where it is technically difficult to use a towed electrical bipole transmitter. In some cases, the operating of the controlled electric sources in the near-shore zones is prohibited by the environmental concerns of the impact of the powerful electric current on the marine fauna. To address the needs of EM exploration in the near-shore zones, a new marine EM method has been recently developed, which is called marine electromagnetic remote sensing (MEMRS). This method consists of a very high moment onshore electric bipole transmitter and a large array of offshore receivers. In this paper we present a feasibility study of the MEMRS method.
- Africa > South Africa > Western Cape Province > Indian Ocean > Bredasdorp Basin > Block 9 > EM Field (0.99)
- Europe > Norway > Barents Sea > PL 532 > Block 7220/8 > Johan Castberg Field > Tubåen Formation (0.89)
- Europe > Norway > Barents Sea > PL 532 > Block 7220/8 > Johan Castberg Field > Stø Formation (0.89)
- (10 more...)
Summary The Skrugard oil and gas discovery in 2011 was a milestone in the Norwegian Barents Sea and established a new province of commercial hydrocarbons. Since the first discovery, additional wells have proven a separate structure named Havis, appraised the initial discovery, and 400-600 mmbls oil are now the basis for the development concept with the ambition of first oil in 2018. Additional prospects are identified and a campaign of exploration wells in 2013 will target separate structures, and results will be available at the time of the conference.
- Europe > Norway > Barents Sea > Nordmela Formation (0.99)
- Europe > Norway > Barents Sea > Bjørnøya Basin (0.99)
- Europe > Norway > Barents Sea > PL 532 > Block 7220/8 > Johan Castberg Field > Tubåen Formation (0.98)
- (29 more...)
Summary While seismic has a superior structural resolution and is sensitive to porosity and the presence of hydrocarbons, it has very little sensitivity to saturation. Controlled-source electromagnetic (CSEM) is, on the other hand, sensitive to hydrocarbon saturation. Thus, joint interpretation of seismic and CSEM inversion results offer a great potential for hydrocarbon saturation and volume estimations. We describe a new workflow employing high resolution deterministic CSEM inversion and statistical seismic AVO inversion that applies in an exploration setting, i.e. without prior assumptions of the background resistivities or the existence, sizes and shapes of resistive anomalies. The high resolution deterministic CSEM inversion has proven better depth placements and more confined resistive anomalies by incorporating seismic horizons into the inversion. We use a statistical AVO inversion for lithology and fluid predictions, called PCube, where a prior model for the elastic properties is defined for different lithology and fluid classes (LFCs) based on geological knowledge and/or information from nearby wells. PCube outputs posterior probability for each LFC specified in the prior model. The inversion results from CSEM and seismic are then co-interpreted utilizing their complementary information. This offers a direct comparison between expected hydrocarbon-filled reservoirs from seismic and whether these reservoirs are of high or low saturation from CSEM inversion results, and to explain resistive anomalies not related to hydrocarbons. Applying the workflow on Skrugard datasets, the joint interpretation clearly shows the ability to discriminate high hydrocarbon saturated from brine/low saturated sand reservoirs. Furthermore, the workflow can also distinguish hydrocarbon related from non-hydrocarbon related resistive anomalies.
- Geophysics > Seismic Surveying > Seismic Interpretation > Seismic Reservoir Characterization > Amplitude vs Offset (AVO) (1.00)
- Geophysics > Electromagnetic Surveying > Electromagnetic Modeling > Electromagnetic Inversion (0.91)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (0.90)
- Europe > Norway > Norwegian Sea > Vøring Basin > License 218 > Block 6707/10 > Aasta Hansteen Field > Luva Field > Nise Formation (0.99)
- Europe > Norway > Norwegian Sea > Vøring Basin > License 218 > Block 6706/12 > Aasta Hansteen Field > Luva Field > Nise Formation (0.99)
- Europe > Norway > Norwegian Sea > Vøring Basin > License 218 B > Block 6707/10 > Aasta Hansteen Field > Luva Field > Nise Formation (0.99)
- (13 more...)
Abstract The Western and South Western Barents Sea is the offshore area south ofBjørnøya and east towards the newly agreed delineation boundary between Norwayand Russia while limited by the Norwegian mainland to the south. In this area, the Snøhvit gas field is in production and the Goliat oilfield is being developed. Recently, encouraging oil finds (Skrugard and Havsul)have increased the interests in the geology and the oil and gas potential ofthe area. The older seismic (acquired more than 30 years ago) of the formerdisputed area between Russia and Norway shows potential for large hydrocarbonfinds, although there would be a possibility that the hydrocarbons might haveleaked out from the prospects. This paper summarizes the large challenges for the marine constructioncontractors working in these areas and discusses various phenomena that affectthe marine operations at extreme cold climate conditions:Long fetch length towards the west causes long periodic waves, necessitating vessels with good motion characteristics outside the range of awide wave spectrum. Of particular importance is drilling rigs and drill shipsthat can work effectively in long periodic waves. The normal wind and wave conditions during the summer construction seasonis as for the Norwegian Sea, however, during fall and winter, the weather canbe extremely challenging. Of particular concern is the unpredictability of theweather caused by suddenly occurring polar lows, a phenomena caused by outburstof low air pressures from the ice edge to the north. The polar lows combinedwith low temperatures can cause vessel icing and loss of vessel stability forconstruction vessels with deck equipment having high centre of gravity. Furthermore, long distances and weak infrastructure lead to logisticschallenges as well as challenges related to evacuation and emergency response, in particular for activities outside the main construction season. It must alsobe noted that ice could be encountered early in the construction season, although very rarely, and that ice monitoring is important should activitiesstart as early as March and April. The marine construction contractor will have to show patience when workingin the area. Joint efforts, improved knowledge, top standard equipment and goodunderstanding of the roles of the contractor and the oil company should, however, ensure successful project execution, also in this cold climateregion.
- Europe > Norway > Barents Sea > PL 532 > Block 7220/8 > Johan Castberg Field > Tubåen Formation (0.99)
- Europe > Norway > Barents Sea > PL 532 > Block 7220/8 > Johan Castberg Field > Stø Formation (0.99)
- Europe > Norway > Barents Sea > PL 532 > Block 7220/8 > Johan Castberg Field > Nordmela Formation (0.99)
- (111 more...)
Coastal Oil Spill Preparedness Improvement Programme (COSPIP) and Memorandum of Understanding – Comprehensive Joint&Industrial Project Focusing on Coastal Oil Spill Challenges
Buffagni, M.. (eni e&p division) | Bjørnbom, E.. (Eni Norge AS) | Hansen, O.. (Eni Norge AS) | Foldnes, G. E. (Eni Norge AS) | Thorbjørnsen, S.. (Norwegian Petro Services AS) | Aiello, G.. (eni e&p division) | Engen, F.. (Statoil ASA)
Copyright 2012, SPE/APPEA International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production This paper was prepared for presentation at the SPE/APPEA International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production held in Perth, Australia, 11-13 September 2012. This paper was selected for presentation by an SPE/APPEA program committee following review of information contained in an abstract submitted by the author(s). Contents of the paper have not been reviewed by the Society of Petroleum Engineers or the Australian Petroleum Production & Exploration Association Limited and are subject to correction by the author(s). The material does not necessarily reflect any position of the Society of Petroleum Engineers or the Australian Petroleum Production & Exploration Association Limited, its officers, or members. Electronic reproduction, distribution, or storage of any part of this paper without the written consent of the Society of Petroleum Engineers or the Australian Petroleum Production & Exploration Association Limited is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of SPE copyright. Abstract In the first "Integrated Management Plan for the Barents Sea and the Sea Areas off the Lofoten Islands", issued by the Norwegian government in 2006, oil spill preparedness was one of the main significant issues to be addressed, with a relevant political focus for near shore petroleum activities and environmental vulnerable resources. A need to improve the coastal oil spill response capability was therefore identified early in relation to the planning and development of the Goliat oil field, located in the south western part of the Barents Sea, and consequently a strategy was developed. Eni Norge and eni e&p joined forces to substantially contribute to the development of this strategy through the COSPIP JIP and a Memorandum of Understanding issued with Statoil, the only license partner in Goliat.
- Europe > Norway > Barents Sea (0.48)
- Oceania > Australia > Western Australia > Perth (0.24)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Europe Government > Norway Government (0.34)
- Europe > Norway > Barents Sea > Hammerfest Basin > PL 229 > Block 7122/8 > Goliat Field > Kapp Toscana Group > Realgrunnen Subgroup > Kapp Toscana Group > Realgrunnen Subgroup > Snadd Formation > Realgrunnen Subgroup > Tubåen Formation > Sassendalen Group > Kobbe Formation (0.99)
- Europe > Norway > Barents Sea > Hammerfest Basin > PL 229 > Block 7122/8 > Goliat Field > Kapp Toscana Group > Realgrunnen Subgroup > Kapp Toscana Group > Realgrunnen Subgroup > Snadd Formation > Realgrunnen Subgroup > Tubåen Formation > Klappmyss Formation > Kobbe Formation (0.99)
- Europe > Norway > Barents Sea > Hammerfest Basin > PL 229 > Block 7122/8 > Goliat Field > Kapp Toscana Group > Realgrunnen Subgroup > Kapp Toscana Group > Realgrunnen Subgroup > Snadd Formation > Realgrunnen Subgroup > Sassendalen Group > Sassendalen Group > Kobbe Formation (0.99)
- (111 more...)