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Year of grant: 2010 Research Area: Náttúra og náttúrutilfeingi Project type: Ph.d.verkætlan Project title: Epiclastic volcaniclastic influence on potential hydrocarbon reservoirs: A case study from Faroe Shetland Basin and onshore Faroe Islands Grant number: 0422 Project manager: Jana Ólavsdóttir Institution/company: Jarðfeingi/Københavns Universitet Other participants: Lars Erik Boldreel og Morten Sparre Andersen Project period: 01.03.2011 - 20.12.2013 Total budget: 1.896.560,84 DKK Grant from the FRC in DKK: 425.000 DKK Project description: Original The aim of this project is to find out, what influence the volcaniclastic erosion products from the Faroe Platform, Munkagrunnur Ridge and Fugloy Ridge, have on the possible reservoir quality of the post,basalt sedimentary unit in the Faroe,Shetland Basin. So far, there have not been so much focus on the post,basalt section in the Faroese part of the Faroe Shetland Basin The reason for that is most likely because of the higher expecting chances for hydrocarbon discoveries in the sub,basalt layers. During the last decade there have been made some hydrocarbon discoveries in the intra, and post,basalt equivalent strata in the UK area of the Basin, but as understood all these reservoirs are of siliciclastic origin. From seismic interpretation it is seen that most of the volcaniclastic material in the Faroe Sheltand Basin is concentrated in the Faroese part of the Basin. That is why it is appropriate to have the effect of these materials investigated. It is impossible to get offshore samples of volcaniclastic material. Therefore, onshore volcaniclastic samples from Faroe Islands are investigated as an analogy Normally the reservoir quality of a volcaniclastic related rocks have a bad reputation as a reservoir rock. That is because of the high amount of unstable mineral. There are two categorise of volcaniclastic rocks, primary (formed by volcanic activity) and secondary rocks (formed by sedimentary processes). In the post,basalt section in the Faroese area of the Faroe Shetland Basin, the volcaniclastic rocks are secondary rocks deposited as deltas, fans etc in a distal environment. The further away the deposits are from the source area the higher chance is it that the week mineral are destroyed during transport. According to the onshore rocks they are both primary and secondary volcaniclastic rocks where focus will be on the secondary rocks. The onshore secondary volcanicalstic rock did have a shorter transport distance deposited in a more proximal environment then the offshore volcaniclastic rocks. Therefore they most likely are of a lower reservoir quality then the offshore rock. Final: Emplacement of the Cenozoic sediments in the Faroese sector of the Faroe-Shetland Basin appear to be controlled by decelerating thermal subsidence of the basin, and local uplift of sediment source areas. However, the actual distribution of sediments appears to be controlled by re-activation of older, Mesozoic structural elements controlling the sediment path way and restricting the depositional areas. The structural elements being re-activated at different times causing considerable structural complexity. Understanding older, Mesozoic, structural elements control on sedimentation is a potential tool understanding deviations from “normal” thermal subsidence and for predicting the prospectivity in syn- and post-rift succession in the Faroe-Shetland Basin. On top of the basalt in the Faroe-Shetland Basin there is deposited up to 3.5 km thick sedimentary package, which led into the basin from different directions. With interpretations of 2-D and 3-D reflection seismic data of the post-basalt package it is shown which adjacent areas the various sub-sedimentary packages comes from and where they are located in the basin at specific time intervals. The adjacent areas to the Faroe-Shetland Basin are constructed of various compositions, where Munkagrunnur Ridge, Fugloy Ridge and Faroe Platform consist of basaltic material while the NW British Platform area is composed of more stable rocks. The derived erosion products from the different adjacent areas will therefore be of diverse quality regarding to a possible future hydrocarbon reservoirs in the intra- and post-basalt strata. Volcanic derived erosion material has always been avoided as potential hydrocarbon reservoirs due to its bad reputation as a hydrocarbon reservoir. In this study the potential reservoir quality of the intra basalt tuff and epi-volcaniclastic layers onshore Faroe Islands are investigated and some of the intervals hold interesting properties. The results can be used as a first attempt for future studies of intra basalt tuff and epi-volcaniclastic reservoirs. Project status: Liðug Project output: Scientific Publications: 1. Development of a Shelf Margin Delta due to Uplift of Munkagrunnur Ridge at the Margin of Faroe–Shetland Basin: A Seismic Sequence Stratigraphic Study. Petroleum Geoscience. 2. Seismic stratigraphic analysis of the Cenozoic sediments on East Faroe Platform – implications for inherited structural control of sediment distribution 3. Reservoir quality of the intra-basalt volcaniclastic units onshore Faroe Islands, North Atlantic Igneous Province, NE Atlantic. 4. Distribution of progradational units and deep water fans on the East Faroe Platform – implications for structural controls and sediment source areas. Scientific Presentations: 1. Ólavsdóttir, J. & Stoker, M., Post basalt prospectivity. Oral presentation presented by Ólavsdóttir J. at the second Faroe Islands Exploration Conference (FIEC06), Tórshavn, Faroe Islands 12-13 September 2006. 2. Ólavsdóttir, J., Hydrocarbon exploration in volcanic rocks. Oral presentation, presented by Ólavsdóttir at the 1st Jóannes Rasmussen Conference 2007: Evolution of Basaltic Provinces, Tórshavn, Faroe Islands 29-30 august 2007. 3. Ólavsdóttir, J., Reservoir quality assessment of the volcaniclastic intra- and post-basalt sediments in the Faroe-Shetland Basin with comparison to world wide examples, Oral Presentation presented by Ólavsdóttir at the FORCE Seminar called Prospectivity in the Volcanic Province of the NW Atlantic Oslo, Norway, 4-6 June 2008. 4. Ólavsdóttir, J., 3-D Seismic Sequence Stratigraphic study of Mid-Eocene clinoforms in the Faroe-Shetland Basin, NE Atlantic Ocean, Clinoform Sedimentary Deposits, Poster Presentation presented by Ólavsdóttir at the Processes Producing Them And The Stratigraphy Defining Them, Rock Springs, Wyoming USA, August 15-18 2008. 5. Ólavsdóttir, J., Three-dimensional Seismic Sequence Stratigraphic study of Mid-Eocene clinoforms in the Faroe-Shetland Basin, NE Atlantic Ocean, Oral Presentation presented by Ólavsdóttir at the Deltas & Beaches: Traps for Fossil Fuels, London UK 6-7 November 2008. 6. Ólavsdóttir, J. Post-basalt deposits in the Faroese sector of the Faroe-Shetland Basin, NE Atlantic Ocean, Poster Presentation presented by Ólavsdóttir at the Seventh Petroleum Geology Conference: from Mature Basins to New Frontiers QEII Centre, London, UK, 30 March – 02 April 2009. 7. Ólavsdóttir, J. Reservoir quality of the intra-basalt units onshore Faroe Islands as an analogy to the offshore intra- and post-basalt epiclastic sedimentary rocks, Oral Presentation presented by Ólavsdóttir at the 3rd Faroe Islands Exploration Conference (FIEC09), Tórshavn, Faroe Islands, 15-16 September 2009. 8. Ólavsdóttir, J., Andersen, M. S. and Boldreel, L. O., Structural controle on the distribution of Eocene progradational units and deep water fans in the NW Faroe-Shetland Basin - implications for hydrocarbon exploration, Oral Presentation presented by Ólavsdóttir at the 4th Faroe Islands Exploration Conference (FIEC12), Tórshavn, Faroe Islands, 1-2 May 2012. 9. Ólavsdóttir, J., Implications of inherited structural control of post volcanic sediment influx, NW Faroe-Shetland Basin, Oral Presentation presented by Ólavsdóttir at the NAG-TEC Reykjavik workshop, Iceland 11 June 2012. 10. Ólavsdóttir, J., Andersen, M. S. and Boldreel, L. O., Seismic stratigraphic analysis of the Cenozoic sediments in NW Faroe-Shetland Basin – implications for inherited structural control of sediment distribution, Oral presentation presentation presented by Ólavsdóttir, J. at the 3rd Conjugate Margin Conference , Dublin, Ireland, 22-24- August 2012. << Back |
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