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3-D seismic travel-time tomography validation of a detailed subsurface model: A case study of the Záncara river basin (Cuenca, Spain)

AuthorsMartí, David ; Marzán, Ignacio ; Sachsenhauser, Jana; Alvarez-Marrón, Joaquina ; Ruiz Fernández, Mario ; Torné, Montserrat ; Mendes, Manuela; Carbonell, Ramón
Seismic prospecting
Seismic waves
Structural geology
Underground structures
Velocity distribution
Well logging
Geophysical measurements
High resolution seismic
Sedimentary sequence
Seismic travel time
Seismic velocities
Tomographic inversion
Travel time tomography
Wedge-shaped structure
Issue DateFeb-2019
PublisherEuropean Geosciences Union
CitationSolid Earth, 10: 177-192 (2019)
AbstractA high-resolution seismic tomography survey was acquired to obtain a full 3-D P-wave seismic velocity image in the Záncara river basin (eastern Spain). The study area consists of lutites and gypsum from a Neogene sedimentary sequence. A regular and dense grid of 676 shots and 1200 receivers was used to image a 500 m×500 m area of the shallow subsurface. A 240-channel system and a seismic source, consisting of an accelerated weight drop, were used in the acquisition. Half a million travel-time picks were inverted to provide the 3-D seismic velocity distribution up to 120 m depth. The project also targeted the geometry of the underground structure with emphasis on defining the lithological contacts but also the presence of cavities and fault or fractures. An extensive drilling campaign provided uniquely tight constraints on the lithology; these included core samples and wireline geophysical measurements. The analysis of the well log data enabled the accurate definition of the lithological boundaries and provided an estimate of the seismic velocity ranges associated with each lithology. The final joint interpreted image reveals a wedge-shaped structure consisting of four different lithological units. This study features the necessary key elements to test the travel time tomographic inversion approach for the high-resolution characterization of the shallow subsurface. In this methodological validation test, travel-time tomography demonstrated to be a powerful tool with a relatively high capacity for imaging in detail the lithological contrasts of evaporitic sequences located at very shallow depths, when integrated with additional geological and geophysical data.
Publisher version (URL)https://doi.org/10.5194/se-10-177-2019
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