2D gravity modeling of shale diapirs in the northern margin of the West Alboran Basin
Modelado gravimétrico 2D de dlapiros arcillosos en el margen norte de la Cuenca Oeste de Alborán
-
Publication Date
2017 -
Publisher
Sociedad Geológica de España -
Abstract
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 inte rval velo cities from sonic logs measured in the nearby Andalucía G 1 well. Free Air gravity anomaly has been the gravity anomaly modeled, extracted from a regional dataset. During the 2D gravity modeling, various average densities and Moho depths were tested. The best gravimetric adjustment is obtained with a model which comprises seven layers: Pilo-Pleistocene successions (2.00g/cm3), Miocene successions (2.30 g/cm3), shale diapirs (lower Miocene) with three la yers ( 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)