Las formaciones esponjiolíticas del Dogger de la región Vasco-Cantábrica:Características y posibilidades petrolíferas
- S. Quesada 1
- V. Pujalte 1
- S. Robles 1
- J. C. Vicente 1
- 1 Dpto. Estratigrafía, Geodinámica y Paleontología. Universidad del País Vasco
ISSN: 0213-683X
Año de publicación: 1989
Número: 7
Páginas: 26-28
Tipo: Artículo
Otras publicaciones en: Geogaceta
Resumen
Siliceous sponges occur in the western Basque-Cantabrian region at two stratigraphic intervals: at the Lower Bajocian they appear in small mounds (less than 1 m.) isolated within a predominantly mar//limestone succession; an at the Upper Bajocian (Parkinsoni Biozone) as larger bioherms and biostromes, within an extensive carbonate plat form. The latter is up to 20 m. thick and a better hydrocarbon target than the Lower Bajocian mounds, mainly as fractured reservoirs. An example is described where local tectonics have determined a pervasive fracturation of these rocks, thus creating an important secondary porosity.