EGU2020-22146
https://doi.org/10.5194/egusphere-egu2020-22146
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

SIT4ME: seismic imaging of mineral-hosting structures in Sotiel-Coronada (Spain)

Yesenia Martínez1,2, Juan Alcalde1, David Martí3, Puy Ayarza2, Mario Ruiz1, Ignacio Marzán1, Fernando Tornos4, Alireza Malehmir5, Alba Gil5, Stefan Buske6, Dirk Orlowsky7, Imma Palomeras2, Juan Manuel Pons8, Juan Carlos Videira8, Irene De Felipe1, and Ramon Carbonell1
Yesenia Martínez et al.
  • 1Salamanca University, Geology, Salamanca, Spain (yesimartinez@usal.es)
  • 2Department of Geology, University of Salamanca, Spain
  • 3Lithica SCCL, Spain
  • 4Institute of Geosciences, CSIC-UCM, Spain
  • 5Department of Earth Sciences, Uppsala University, Sweden
  • 6Technische Universität Bergakademie Freiberg, Germany
  • 7DMT GmbH & Co, Germany
  • 8MATSA, Almonaster la Real (Huelva, Spain)

In order to tackle the ever-increasing demand of raw materials, the European Institute of Technology (EIT) promotes research and innovation solutions for safe and sustainable mineral exploration through its Raw Materials Programme. The SIT4ME project (“Seismic Imaging Techniques for Mineral Exploration”) has been funded as part of this program to develop efficient techniques in seismic acquisition and imaging methods for mineral exploration in crystalline environments. Within SIT4ME, a multidisciplinary data acquisition experiment (i.e. 3D-3C active and passive source seismic datasets) took place in November 2009 in Sotiel-Coronada (Iberian Pyrite Belt, SW Spain). The aim of this experiment was to image a 300-500 m depth pyrite-rich massive sulfide orebody interbedded with felsic volcanic rocks and shales. The seismic dataset involves the recording of 875 vibration points in 653 seismic receivers, distributed in a 3D mesh around the target and six 2D crooked lines. Conventional processing workflow (such as static corrections, surface-consistent deconvolution, amplitude equalization, frequency filtering, and velocity analysis) was combined with more advance methods (e.g. ground roll attenuation or post-stack coherency filtering) to obtain robust images of the subsurface of the target area. The processing workflow has been applied to four 2D seismic sections, one in the North-South and three in the East-West directions, distributed across the study area. The preliminary imaging results show coherent reflective packages down to two seconds two-way traveltime (TWT). The North-South line contains a north-dipping ~400 m long highly reflective zone in the center at 130 ms TWT. The east-west profiles show a slightly folded structure (antiform and synform) which is evident down to 0.25 s TWT. Towards the north, the seismic lines become parallel to subsurface structures and therefore the track of these structures is lost. Current work involves the incorporation of well-log data to improve the quality and resolution of the interpretations. The next processing steps will involve pre-stack depth migration, P-wave travel-time tomography and a combined analysis of controlled source imaging and ambient noise interferometry data.

The SIT4ME project has been funded by EIT Raw Materials (17024).

How to cite: Martínez, Y., Alcalde, J., Martí, D., Ayarza, P., Ruiz, M., Marzán, I., Tornos, F., Malehmir, A., Gil, A., Buske, S., Orlowsky, D., Palomeras, I., Pons, J. M., Videira, J. C., De Felipe, I., and Carbonell, R.: SIT4ME: seismic imaging of mineral-hosting structures in Sotiel-Coronada (Spain), EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-22146, https://doi.org/10.5194/egusphere-egu2020-22146, 2020

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Display material version 1 – uploaded on 08 May 2020
  • AC1: Comment on EGU2020-22146, Alba Gil de la Iglesia, 08 May 2020

    Hello Yesenia, nice work.
    In the shot gathers, it is not possible to see any reflection below 1s, do you know which could be the reason?