<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control"^^ . "The Cantabrian Zone in NW Spain represents the foreland fold and thrust belt of the Variscan orogen, formed by Precambrian basement covered by an almost complete\r\nsuccession of Palaeozoic sediments, mostly deposited on a passive margin. Most of the succession underwent deformation with almost no internal strain (Pastor-Galán\r\net al., 2009), and in most areas with only a diagenetic overprint. This includes, however, several thermal events (only locally up to the epizone) and different episodes\r\nof fluid flow. One of these epigenetic fluid flow events produced pervasive dolomitization on a large scale covering over 1000 km2 in todays outcrops. The present research focused on this post-orogenic hydrothermal dolomitization, which strongly increased porosity and permeability in large volumes of rocks. It affected mainly Carboniferous but to a smaller degree also older carbonate successions.\r\nEarlier research (Gasparrini et al., 2006; Lapponi et al., 2007) concentrated on the type of dolomite and its geochemical and isotopic characteristics, as well as the\r\nfluids generating this dolomite (very saline, originally evaporitic brines with elevated temperature). Of special interest was the timing of dolomitization (latest Carboniferous/earliest Permian) and the relation with the geodynamic setting: dolomitization was associated, at least time wise, with the bending of the Cantabrian Arch (see\r\nGutiérrez-Alonso et al., 2004; Weil et al., 2013) related with a lithospheric delamination-induced thermal event. These main results were confirmed by this research.\r\n\r\nThe investigated area was distinctly extended compared with the mentioned earlier research. A study of petrophysical properties, geochemistry and fluid inclusions was\r\ncarried out, in relation to the characterization of the dolomite bodies and the structural setting. Of special interest was the amount, types and regional distribution of\r\nporosity and permeability. Various parameters such as crystal size, orientation of the porosity in relation to dolomite textures and fabrics, and eventual rhythmicity\r\nof pore space are used to identify regional dolomitization patterns The data from the investigated outcrops within the large area of research serve to outline areas of increased porosity and permeability. The latter favourable factors might allow to predict locations of dolomite reservoirs with enhanced porosity elsewhere.\r\n\r\nLarge bodies of hydrothermal dolomite were favoured by: (i) a restricted and large reservoir of highly evaporated sea water; (ii) intense fracturing acting as fluid flow pathways; and (iii) a high thermal gradient enhancing convectional fluid flow. Positive petrophysical properties are affected by specific dolomite fabrics (Zebra, Vuggy,\r\nand Non Macro Porous), over-dolomitization reduced dramatically porosity.\r\n\r\nThe outermost western region of the Cantabrian Orocline provides a combination of the most positive factors for potential dolomite hydrocarbon reservoirs. Here the\r\ndolomite bodies are large, petrophysical properties are favourable, fracturation intensity is high and over-dolomitization is low."^^ . "2015" . . . . . . . "Ingrid Natalia"^^ . "Muñoz Quijano"^^ . "Ingrid Natalia Muñoz Quijano"^^ . . . . . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control (PDF)"^^ . . . "ThesisNMunozQ.pdf"^^ . . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Hydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #18289 \n\nHydrothermal dolomitization of Paleozoic successions in Northern Spain: petrophysical properties and structural control\n\n" . "text/html" . . . "550 Geowissenschaften"@de . "550 Earth sciences"@en . .