Correlación entre registros de sondeos y series de superficie del Aptiense-Albiense continental del extremo SW de la Cuenca Vascocantábrica y su aplicación a la identificación de zonas lignitíferas.

Resumen

Gamma-ray well logs of Aptian and Albian fluvial facies of Palencia, Cantabria and Burgos (SW Basque-Cantabrian Basin, N Spain), show serrated bell and funnel shaped patterns for the Utri/las Fm. and cylindrica/ shaped thicker sequences for the underlying Escucha Fm. Taking into account outcrop data, such differences in log patterns are attributed to different overbank-channel fill facies ratio and to the type of channe/-fill sequences. Coal seams, mainly identified by sonic logs, occur on top of both cylindrical and bel/ shaped gamma-ray facies. Coal occurrence is facies dependent, the major coa/-bearing unit in the fluvial facies (but sti/l non-economic) being the overbank facies rich middle member of the Escucha Fm. Restored cross-section of Aptian-Albian fluvial deposits show that the sedimentation of the Escucha Fm. was strongly controlled by N400 E trending synsedimentary folds