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dc.contributor.authorRamírez M., Marina I.nb_NO
dc.date.accessioned2014-12-19T12:15:03Z
dc.date.available2014-12-19T12:15:03Z
dc.date.created2011-06-17nb_NO
dc.date.issued2010nb_NO
dc.identifier424175nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/239466
dc.description.abstractMany sedimentary basins considered for hydrocarbon exploration are overlaid by basalt layers which disrupts seismic wave propagation due to its properties. A single large gun has a nearly spherical directivity and at low frequencies a regular array still generates a significant portion of energy beyond the critical angle to the top basalt interface, I propose the use of long arrays to limit the directivity into a sub critical angle range. Finite difference modelling was performed in order to determine the applicability of long arrays to acquisition considering how extreme directivity patterns affect the source signature and hence the deconvolution process, it was found that a 120m long array has an almost identical time pressure wave let up to 30º-35º in the inline plane for a frequency band of 5-25Hz. Using simple analytical models it becomes evident that long source arrays are more efficient than single sources and regular arrays,into focusing energy to travel vertically down.nb_NO
dc.languageengnb_NO
dc.publisherNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for petroleumsteknologi og anvendt geofysikknb_NO
dc.titleImpact of seismic source/receiver directivity on sub-basalt imagingnb_NO
dc.title.alternativeIrkningen av seismisk kildes/mottakers direktivitet på subbasealt avbildningnb_NO
dc.typeMaster thesisnb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for petroleumsteknologi og anvendt geofysikknb_NO


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