Las formaciones esponjiolíticas del Dogger de la región Vasco-Cantábrica:Características y posibilidades petrolíferas

  1. S. Quesada 1
  2. V. Pujalte 1
  3. S. Robles 1
  4. J. C. Vicente 1
  1. 1 Dpto. Estratigrafía, Geodinámica y Paleontología. Universidad del País Vasco
Revista:
Geogaceta

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.