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. [1] Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Leioa, España

     
• Localización: Geogaceta, ISSN 0213-683X, Nº. 7, 1989, págs. 26-28
• Idioma: español
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• 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.