2D gravity modeling of shale diapirs in the northern margin of the West Alboran Basin

  1. José Luis Sánchez-Roldán 1
  2. Juan Ignacio Soto 1
  3. Lorenzo Cascone 2
  1. 1 Universidad de Granada, España
  2. 2 Geophysics Group, Repsol Exploración SA, España
Aldizkaria:
Geogaceta

ISSN: 0213-683X

Argitalpen urtea: 2017

Zenbakien izenburua: Comunicaciones presentadas en la LXII Sesión Científica / Guadalupe, 25 de Mayo de 2017

Zenbakia: 62

Orrialdeak: 71-74

Mota: Artikulua

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Beste argitalpen batzuk: Geogaceta

Laburpena

Using a regional seismic profile in the northern margin of the West Alboran Basin, a 2D gravity model was made to assess the gravity response of shale structures in this basin. Time-depth conversion was accomplished taking interval velocities from sonic logs measured in the nearby Andalucía G1 well. Free Air gravity anomaly has been the gravity anomaly modeled, extracted from a regional dataset. During the 2D gravity modeling, various averaged ensities and Moho depths were tested. The best gravimetric adjustment is obtained with a model which comprises seven layers: Plio-Pleistocene successions (2.00 g/cm3), Miocene successions (2.30 g/cm3), shale diapirs (lower Miocene) with three layers (2.05, 2.15 and 2.35 g/cm3; from top to bottom and 60% kaolinite and 40% smectite of average composition), crustal basement (2.82-2.75 g/cm3) and lithosphere mantle (3.20 g/cm3).

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This work was made possible thanks to the support of Repsol. We also acknowledge ConocoPhillips® for providing the seismic line which is the base of this study. IHS® for providing a Kingdom license and Geosoft® for an Oasis Montaj license through academic agreements with the Granada University. We are indebited to Antonio Azor and Antonio Olaiz for their comments, which have help to improve this paper. This contribution is part of the Research Group RNM-376.

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