GEOSCAN, résultats de la recherche


TitreSeabed geo-environmental constraints to offshore hydrocarbon development, Canadian Beaufort Sea
AuteurBlasco, S
SourceProceedings, United States and Canada Northern Oil and Gas Research Forum; 2008 p. 138
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080397
RéunionUnited States and Canada Northern Oil and Gas Research Forum: Current Status and Future Directions in the Beaufort Sea, North Slope and Mackenzie Delta; Anchorage, Alaska; CA; Octobre 28-30, 2008
Mediaen ligne; numérique
ProvinceRégion extracotière du nord
Sujetshydrocarbures; capacité de production d'hydrocarbures; analyse environnementales; etudes de l'environnement; effets sur l'environnement; géologie de l'arctique; climat arctique; milieux marins; géologie de l'environnement; géologie marine
Résumé(disponible en anglais seulement)
The seabed of the Canadian Beaufort Shelf presents unique challenges to Arctic offshore hydrocarbon development. The impact rates of extreme ice scours/gouges need to be understood to determine trenching and burial depths for subsea pipelines. The extent and engineering properties of ice-bearing permafrost to depths of 700 m below seabed must be clearly defined to constrain production well design. Seabed foundation conditions including soft sediments and slope stability need to be assessed for stable gravity based structure emplacement. The distribution of seabed geohazards including over-pressured shallow gas zones, mud volcanism, diapirism, pockmarks and faulting have to be determined to mitigate exploration drilling risks. Knowledge of the distribution of ecologically and biologically sensitive benthic ecosystems is necessary to avoid conflict with development plans. With renewed vessel traffic, navigation hazards such as submerged abandoned artificial drilling islands from the first phase of exploration in the 1970's need to be investigated. Adequate knowledge of these geo-environmental impediments to offshore hydrocarbon development is required to set appropriate and timely codes, standards and regulations as well as to feed engineering design scenarios for offshore structures. Survey technologies such as multibeam sonar and high resolution multichannel reflection seismic profilers combined with seabed sampling are well suited to investigate geo-environmental issues. Knowledge gained from this type of research will allow development to proceed while minimizing the risk to the environment and ensuring human safety.