RT Journal Article T1 Estudio petrográfico y geoquímico de los principales niveles de lutitas negras del Cretácico de Asturias T1 Petrographic and geochemical study of selected Cretaceous black shales of Asturias A1 Borrego, Ángeles G. A1 García Ramos, José Carlos A1 Prado, J. G. AB The Cretaceous deposits of Asturias are traditionally considered the host rock for the oil offshore.Selected Cretaceous black shale levels of Asturias (Northern Spain) are studied with the aim to check their oil generation potential. Most of the black shales (Albian-Cenomanian) were formed in a mud plain where vegetal debris were transported and accumulated. They have very low oil generation potential.Occasionally, detritic amber levels were formed. They exhibit high pyrolysis yields. Only in Llames de Panes a very rich oil shale was found. It was generated in a restricted marginal setting with high organic productivity and is mostly made up of algal lacustrine material. The maturity level was low in all the study places and no regional trend was detected PB Sociedad Geológica de España YR 1996 FD 1996 LK http://hdl.handle.net/10272/12284 UL http://hdl.handle.net/10272/12284 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026