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Rasmussen, Thorkild MaackORCID iD iconorcid.org/0000-0002-1629-2920
Alternative names
Publications (10 of 25) Show all publications
Guarnieri, P., Brethes, A. & Rasmussen, T. M. (2017). Geometry and kinematics of the Triassic rift basin in Jameson Land (East Greenland). Tectonics, 36(4), 602-614
Open this publication in new window or tab >>Geometry and kinematics of the Triassic rift basin in Jameson Land (East Greenland)
2017 (English)In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 36, no 4, p. 602-614Article in journal (Refereed) Published
Abstract [en]

The Triassic rift basin along the east Greenland margin described in this paper is represented by NE-SW trending basins and highs segmented by NW-SE trending transfer zones. Coarse-grained sediments along the eastern side of Jameson Land are shown to be hosted in half-graben structures belonging to the Carlsberg Fjord Basin that is bounded by NW dipping normal faults mapped and described after fieldwork in the Klitdal area in Liverpool Land. New aeromagnetic and electromagnetic data together with new drill cores allow the reinterpretation of available seismic lines showing the continuation of the Triassic rift basin toward the SW where it is buried under the Upper Triassic postrift sediments and the Jurassic successions of the Jameson Land Basin. The N-S trending Liverpool Land, interpreted as the boundary block of the Triassic basin, is shown to represent a structural high inherited from the Late Carboniferous tectonics and faulted during the Triassic rifting. The Carlsberg Fjord Basin and the Klitdal Fault System described in this paper should be seen as analogues to the Helgeland Basin in the Norwegian offshore that is bounded by the Ylvingen Fault Zone and to the Papa and West of Shetlands Basins that are bounded by the Spine Fault. The Triassic rift zone and transfer faults on both conjugate margins show a straightforward correlation with the trends of the initial spreading line and fracture zones of the northeast Atlantic indicating a possible inheritance of the Triassic rifting

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2017
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-62932 (URN)10.1002/2016TC004419 (DOI)000403718200001 ()2-s2.0-85017620952 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-05-19 (andbra)

Available from: 2017-04-07 Created: 2017-04-07 Last updated: 2018-11-07Bibliographically approved
Darwesh, A. K., Maack Rasmussen, T. & Al-Ansari, N. (2017). Kicks controlling techniques efficiency in term of time. Engineering, 9(5), 482-492
Open this publication in new window or tab >>Kicks controlling techniques efficiency in term of time
2017 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 9, no 5, p. 482-492Article in journal (Refereed) Published
Abstract [en]

Kicks are the result of under balance drilling operation. Time consumed to control the kicks will be different in depending on the controlling technique. Drilling fluid considered as a first barrier to control formation pressure and well kicks. Any advance in drilling fluids leads to more controlled operation in term of time. This paper will follow the general increasing profile of pressure before entering the reservoir. Both methods of well controlling technique; circulating techniques and non-circulating have been implemented in many oil blocks. The process of designing and casing selection, setting depth and many other issues is predominately dependent on the utilization of accurate values of formation pressure. Formation pressures used to design safe mud weights to overcome fracturing the formation and prevent well kicks. Hence the emphasis has been placed on the practical utilization of kicks pressure near the reservoir. The presented relationships will help the engineer to better understand lithological columns and reduce potential hole problems during the kick appearance. Selecting the best well controlling practical method can lead to not harming the reservoir and more production later. Changes in some drilling fluid properties have been proposed with increasing the depth without damaging the reservoir. Suggestions in relation to the casing setting point of the intermediate section are also proposed. Standard equations with proper modification for gases and safety margin have been proposed for the future drilling operation in oil fields above the reservoir.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2017
Keywords
Driller Technique, Engineer Technique, Drilling Fluid, Kicks, Reservoir
National Category
Geophysics Geotechnical Engineering
Research subject
Exploration Geophysics; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-63554 (URN)10.4236/eng.2017.95028 (DOI)
Note

Validerad;2017;Nivå 1;2017-05-31 (rokbeg)

Available from: 2017-05-27 Created: 2017-05-27 Last updated: 2017-11-24Bibliographically approved
Darwesh, A. K., Rasmussen, T. M. & Al-Ansari, N. (2017). Time Optimizing near the Pay Zone. Engineering, 9(10), 848-858
Open this publication in new window or tab >>Time Optimizing near the Pay Zone
2017 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 9, no 10, p. 848-858Article in journal (Refereed) Published
Abstract [en]

Well control techniques are used in oil and gas drilling operations to control bottom hole pressure and avoid any fluid influx from formation to the well. These techniques are highly important near the pay zone in term of time. Controlling formation fluid pressure and thereby the formations behavior in a predictable fashion will help toward more optimized environmental friendly drilling operation. Time consumed to control the formation fluid pressure will range between few hours to many days. This paper discusses hydrostatic pressure distribution and changes near the pay zone for one oil blocks in Kur- distan, in the northern part of Iraq. Obtaining homogeneous increase in some drilling fluid properties will help the engineer to better interpret sampling of the lithological columns and reduce potential hole problems and operationtime.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2017
Keywords
Fluid Pressure, Well Control, Drilling Fluid, Formation, Pay Zone
National Category
Engineering and Technology Geotechnical Engineering Geophysics
Research subject
Exploration Geophysics; Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-66142 (URN)10.4236/eng.2017.910050 (DOI)
Note

Validerad;2017;Nivå 1;2017-10-19 (andbra)

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-11-24Bibliographically approved
Rasmussen, T. M. (2016). Current trends in geophysical exploration for minerals. In: : . Paper presented at 32nd Nordic Geological Winter Meeting in Helsinki, 13-15 January 2016.
Open this publication in new window or tab >>Current trends in geophysical exploration for minerals
2016 (English)Conference paper, Oral presentation with published abstract (Other academic)
Keywords
geofysik
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-60809 (URN)
Conference
32nd Nordic Geological Winter Meeting in Helsinki, 13-15 January 2016
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2017-11-24Bibliographically approved
Tavakoli, S., Bauer, T., Rasmussen, T. M., Weihed, P. & Elming, S.-å. (2016). Deep massive sulphide exploration using 2D and 3D geoelectrical and induced polarization data in Skellefte mining district, northern Sweden (ed.). Geophysical Prospecting, 64(6), 1602-1619
Open this publication in new window or tab >>Deep massive sulphide exploration using 2D and 3D geoelectrical and induced polarization data in Skellefte mining district, northern Sweden
Show others...
2016 (English)In: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478, Vol. 64, no 6, p. 1602-1619Article in journal (Refereed) Published
Abstract [en]

Geoelectrical and induced polarization data from measurements along three profiles and from one 3D survey are acquired and processed in the central Skellefte District, northern Sweden. The data were collected during two field campaigns in 2009 and 2010 in order to delineate the structures related to volcanogenic massive sulphide deposits and to model lithological contacts down to a maximum depth of 1.5 km. The 2009 data were inverted previously, and their joint interpretation with potential field data indicated several anomalous zones. The 2010 data not only provide additional information from greater depths compared with the 2009 data but also cover a larger surface area. Several high-chargeability low-resistivity zones, interpreted as possible massive sulphide mineralization and associated hydrothermal alteration, are revealed. The 3D survey data provide a detailed high-resolution image of the top ∼450 m of the upper crust around the Maurliden East, North, and Central deposits. Several anomalies are interpreted as new potential prospects in the Maurliden area, which are mainly concentrated in the central conductive zone. In addition, the contact relationship between the major geological units, e.g., the contact between the Skellefte Group and the Jörn Intrusive Complex, is better understood with the help of 2010 deep-resistivity/chargeability data. The bottommost part of the Vargfors basin is imaged using the 2010 geoelectrical and induced polarization data down to ∼1-km depth.

National Category
Geophysics Geology
Research subject
Exploration Geophysics; Ore Geology
Identifiers
urn:nbn:se:ltu:diva-15251 (URN)10.1111/1365-2478.12363 (DOI)000386158100014 ()2-s2.0-84961572568 (Scopus ID)ebf80035-8141-4c62-94db-d97a3d1a5641 (Local ID)ebf80035-8141-4c62-94db-d97a3d1a5641 (Archive number)ebf80035-8141-4c62-94db-d97a3d1a5641 (OAI)
Note

Validerad; 2016; Nivå 2; 2016-11-21 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Darwesh, A., Rasmussen, T. M. & Al-Ansari, N. (2016). Evaluation of Limestone Interval in the Drilled Surface Section of Bn-1 Oil Well (ed.). Paper presented at . Engineering, 8(8), 515-524
Open this publication in new window or tab >>Evaluation of Limestone Interval in the Drilled Surface Section of Bn-1 Oil Well
2016 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 8, no 8, p. 515-524Article in journal (Refereed) Published
Abstract [en]

The first exploration oil well in any oil block consumes in general more time and cost than the other wells in the same block. Evaluating the drilled wells serves to improve the future operations. This paper evaluates the drilled surface section through real field data for the first exploration oil well drilled in one of the oil blocks, in Kurdistan north of Iraq. The surface section of the well was drilled with the conventional method to penetrate many different geological formations with tight intervals. Drilling efficiency and the difficulties encountered are discussed and explained using various data sources. All daily drilling reports concerning a specific interval were studied. This includes weight on bit, string rotation, mud pump flow and penetration rate. Evaluation was carried out by analyzing the used controllable drilling parameters with the formations features. Penetration of the Pila Spi formation (Middle Eocene) was the most difficult formation in the drilled section. Microsoft Office 365 Pro Plus used in making graphs and Excel tables. Evaluations showed that the conventional technology used left many negative effects, like increase in None Productive Time NPT, cost and ground water pollution. Simultaneous Casing Drilling method proposed as an alternative method for the future campaign.

National Category
Geotechnical Engineering Geophysics
Research subject
Soil Mechanics; Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-14534 (URN)10.4236/eng.2016.88048 (DOI)de60cbb9-3c17-4a73-8676-969a399480ec (Local ID)de60cbb9-3c17-4a73-8676-969a399480ec (Archive number)de60cbb9-3c17-4a73-8676-969a399480ec (OAI)
Note
Validerad; 2016; Nivå 1; 20160825 (nadhir)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Brethes, A., Guarnieri, P., Rasmussen, T. M. & Bauer, T. (2016). Geological Analysis of Aeromagnetic Data over the Blyklippen Lead-zinc Mine at Mesters Vig, Central East Greenland. In: First Conference on Geophysics for Mineral Exploration and Mining: Near Surface Geoscience 2016, Barcelona, Spain, 4-8 September 2016. Paper presented at 1st Conference on Geophysics for Mineral Exploration and Mining, Barcelona, Spain, 4-8 September 2016. Houten, Article ID Mo MIN 05.
Open this publication in new window or tab >>Geological Analysis of Aeromagnetic Data over the Blyklippen Lead-zinc Mine at Mesters Vig, Central East Greenland
2016 (English)In: First Conference on Geophysics for Mineral Exploration and Mining: Near Surface Geoscience 2016, Barcelona, Spain, 4-8 September 2016, Houten, 2016, article id Mo MIN 05Conference paper, Published paper (Refereed)
Abstract [en]

In the Mesters Vig area epithermal Pb-Zn sulphide-bearing quartz veins are associated with the border faults of a NNW-SSE elongated graben down-faulting Carboniferous to Lower Triassic sediments. The analysis of the total magnetic field, tilt derivative, vertical derivative and analytic signal allowed to define subcropping magnetic domains and identify structural trends. Doleritic dykes, sills and faults were mapped and structural relationships were established between them. Finally, aeromagnetic data allowed here to delineate structural trends along and in the vicinity of which mineralized quartz veins are mapped.

Place, publisher, year, edition, pages
Houten: , 2016
Keywords
aeromagnetic, lead, zinc
National Category
Geophysics Geology
Research subject
Exploration Geophysics; Ore Geology
Identifiers
urn:nbn:se:ltu:diva-60806 (URN)2-s2.0-85007285687 (Scopus ID)9789462821958 (ISBN)
Conference
1st Conference on Geophysics for Mineral Exploration and Mining, Barcelona, Spain, 4-8 September 2016
Projects
CRUS3D Nordmin
Funder
Nordic Council of Ministers
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2018-02-15Bibliographically approved
Brethes, A., Rasmussen, T. M., Guarnieri, P. & Bauer, T. (2016). Mapping and characterization of Induced Polarization in airborne TEM data from central East Greenland: application of a Self-Organizing Map procedure. In: : . Paper presented at 4th International Workshop on Induced Polarization - IP2016, Aarhus, June 6-8, 2016.
Open this publication in new window or tab >>Mapping and characterization of Induced Polarization in airborne TEM data from central East Greenland: application of a Self-Organizing Map procedure
2016 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

nduced Polarization (IP) effects were observed in airborne Time Domain EM (TEM) data acquired in central East Greenland in the context of exploration for disseminated sulphides in a sedimentary basin. Some of the IP anomalies were targeted by drilling which revealed the absence of mineralization. In order to understand the possible causes of the IP effects we first identified them in the TEM data. IP indicators were extracted from the shape of the transient curves at every measurement location and were analysed by using a Self-Organizing Map (SOM) procedure. Results from K-mean clustering of the SOM are visualized on a geographical map showing the transient curves’ characteristics. Some of the clusters are clearly correlated with the geology whereas others merely reflect recordings below the noise level. In order to interpret the cause of the IP anomalies the airborne TEM data were inverted for the Cole-Cole parameters.

National Category
Geophysics Geology
Research subject
Exploration Geophysics; Ore Geology
Identifiers
urn:nbn:se:ltu:diva-60805 (URN)
Conference
4th International Workshop on Induced Polarization - IP2016, Aarhus, June 6-8, 2016
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2018-02-15Bibliographically approved
Alakangas, L. & Rasmussen, T. M. (2016). Project: Development, Evaluation and Optimization of Measures to Reduce the Impact on the Environment from Mining Activities in Northern Regions. Paper presented at .
Open this publication in new window or tab >>Project: Development, Evaluation and Optimization of Measures to Reduce the Impact on the Environment from Mining Activities in Northern Regions
2016 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

Min-North is a transnational project financed by the Interreg Nord program and coordinated by LTU. The project is a cooperation between Geological survey of Finland, GTK, Oulo University (Finland), The Arctic University of Norway, UiT and several (>17) small and large enterprises and mining companies in the northern region with expertise within geology, waste management, geophysics and geochemistry. The overall goal is to reduce the environmental impacts of mining in the northern regions by developing, evaluating, optimizing environmental techniques. In Sweden, geophysical and geochemical techniques will be integrated to develop a 4D model for tracing pollution transport in the mine waste, mine areas and in(to) the surroundings.

National Category
Geochemistry Geophysics
Research subject
Applied Geochemistry; Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-36041 (URN)3c0ac9e0-422f-4d05-9df8-85b719d6d55a (Local ID)3c0ac9e0-422f-4d05-9df8-85b719d6d55a (Archive number)3c0ac9e0-422f-4d05-9df8-85b719d6d55a (OAI)
Note

Status: Ongoing; Period: 01/01/2016 → 31/12/2018

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Brethes, A., Rasmussen, T. M., Guarnieri, P. & Bauer, T. (2015). 3D modelling of the base-metal mineralized Jameson Land Basin (central East Greenland) using geologically constrained inversion of magnetic data (ed.). Paper presented at Saying goodbye to a 2D Earth : 02/08/2015 - 07/08/2015. Paper presented at Saying goodbye to a 2D Earth : 02/08/2015 - 07/08/2015.
Open this publication in new window or tab >>3D modelling of the base-metal mineralized Jameson Land Basin (central East Greenland) using geologically constrained inversion of magnetic data
2015 (English)Conference paper, Poster (with or without abstract) (Other academic)
Keywords
Earth sciences - Endogenous eartn sciences, 3d modelling, geophysics, Geovetenskap - Endogen geovetenskap
National Category
Geophysics Geology
Research subject
Exploration Geophysics; Ore Geology
Identifiers
urn:nbn:se:ltu:diva-30776 (URN)4b596824-cf2c-4d5c-8362-c004d77fc2c1 (Local ID)4b596824-cf2c-4d5c-8362-c004d77fc2c1 (Archive number)4b596824-cf2c-4d5c-8362-c004d77fc2c1 (OAI)
Conference
Saying goodbye to a 2D Earth : 02/08/2015 - 07/08/2015
Note
Godkänd; 2015; 20151127 (thomaa)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-02-15Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1629-2920

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