{"id":1034,"date":"2014-07-15T13:38:54","date_gmt":"2014-07-15T13:38:54","guid":{"rendered":"http:\/\/hebergement.u-psud.fr\/brigaud\/?p=1034"},"modified":"2014-11-18T20:29:12","modified_gmt":"2014-11-18T20:29:12","slug":"1034","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/1034\/","title":{"rendered":"Article &#8211; Mod\u00e9lisation 3D du sous-sol : de l\u2019\u00e9chelle microm\u00e9trique \u00e0 celle du r\u00e9servoir"},"content":{"rendered":"<p style=\"text-align: justify;\">L&rsquo;article intitul\u00e9 \u00ab\u00a0<em><a href=\"http:\/\/dx.doi.org\/10.1016\/j.marpetgeo.2014.07.004\" target=\"_blank\">Characterization and origin of permeability-porosity heterogeneity in shallow-marine carbonates : from core scale to 3D reservoir dimension (Middle Jurassic, Paris Basin, France)<\/a><\/em>\u00a0\u00bb par Benjamin Brigaud, Beno\u00eet Vincent, Christophe Durlet, Jean-Fran\u00e7ois Deconinck, Emmanuel Jobard, Niel Pickard, B\u00e9atrice Yven et Philippe Landrein est pr\u00eat pour une publication dans la revue Marine and Petroleum Geology.<\/p>\n<p style=\"text-align: justify;\">Un des d\u00e9fis dans le domaine des sciences de la terre est d\u2019arriver \u00e0 mieux appr\u00e9hender le changement d\u2019\u00e9chelle entre la caract\u00e9ristique d\u2019un \u00e9chantillon de roche observ\u00e9e en laboratoire, parfois jusqu\u2019\u00e0 l\u2019\u00e9chelle microm\u00e9trique et son comportement <i>in situ<\/i>, dans le sous-sol \u00e0 l\u2019\u00e9chelle plurikilom\u00e9trique. Ce changement d\u2019\u00e9chelle peut s\u2019av\u00e9rer particuli\u00e8rement important pour comprendre, pr\u00e9dire et ainsi visualiser en 3D certaines ressources pr\u00e9sentes dans le sous-sol comme l\u2019eau, les hydrocarbures ou les m\u00e9taux. Les roches s\u00e9dimentaires du sous-sol, notamment carbonat\u00e9es, peuvent former des r\u00e9servoirs pour les ressources en eau ou en hydrocarbures, dont une forte porosit\u00e9 et perm\u00e9abilit\u00e9 est un gage de qualit\u00e9. Ces aquif\u00e8res ou r\u00e9servoirs d\u2019hydrocarbures sont \u00e9tudi\u00e9s \u00e0 partir de forages, donnant un aper\u00e7u tr\u00e8s ponctuel de la qualit\u00e9, par exemple 2 km de long avec un diam\u00e8tre ne d\u00e9passant pas 20 cm, de l\u2019ensemble de la roche contenant cette ressource, dont le volume total peut atteindre plusieurs milliers de kilom\u00e8tres cube.<\/p>\n<p style=\"text-align: justify;\">Une collaboration entre universitaires (Universit\u00e9 Paris-Sud et Universit\u00e9 de Bourgogne) et industriels (Cambridge Carbonate, Andra, Statoil, Captair) dirig\u00e9e par Benjamin Brigaud (G\u00e9osciences Paris Sud, Universit\u00e9 Paris-Sud\/CNRS) a apport\u00e9 une m\u00e9thode innovante sur ce changement d\u2019\u00e9chelle en \u00e9tudiant un ensemble de roches carbonat\u00e9es \u00e9pais de 200 m et enfouis \u00e0 plus de 500 m de profondeur dans l\u2019Est du Bassin de Paris. Cette nouvelle m\u00e9thode se d\u00e9roule en cinq \u00e9tapes. (1) La premi\u00e8re consiste \u00e0 reconstruire pr\u00e9cis\u00e9ment, par une \u00e9tude des faci\u00e8s s\u00e9dimentaires, la g\u00e9om\u00e9trie de l\u2019ensemble formant un empilement d\u2019une dizaine de couches. (2) La deuxi\u00e8me \u00e9tape consiste \u00e0 l\u2019analyse en laboratoire de la perm\u00e9abilit\u00e9 (de 0,01 mDarcy \u00e0 1 Darcy), de la porosit\u00e9 (de 1 \u00e0 17%), du rayon de l\u2019espace connectant deux pores entre eux (variant de 0,25 \u00b5m \u00e0 32 \u00b5m) et surtout du signal en r\u00e9sonance magn\u00e9tique nucl\u00e9aire (RMN) des roches carbonat\u00e9es du site pr\u00e9lev\u00e9es dans un forage, rendant compte de leur h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9. Sur ces m\u00eames \u00e9chantillons, l\u2019espace poreux a \u00e9t\u00e9 observ\u00e9 \u00e0 tr\u00e8s petite \u00e9chelle au MEB afin de pr\u00e9ciser la forme des pores ou leur variation de taille (de 1 \u00b5m \u00e0 100 \u00b5m). Ces analyses de laboratoire ont permis de red\u00e9finir les \u00e9quations permettant de calculer \u00e0 partir du signal RMN, la porosit\u00e9 ou la perm\u00e9abilit\u00e9 des roches carbonat\u00e9es. (4) Dans une quatri\u00e8me \u00e9tape, le signal RMN a \u00e9t\u00e9 mesur\u00e9 dans 12 puits \u00e0 partir d\u2019une sonde. Les nouvelles \u00e9quations utilis\u00e9es ont permis d\u2019avoir un enregistrement continu de la porosit\u00e9 sur presque 2 km. (5) Un logiciel de mod\u00e9lisation g\u00e9ologique performant a \u00e9t\u00e9 utilis\u00e9 afin de propager les caract\u00e9ristiques de perm\u00e9abilit\u00e9s et porosit\u00e9s mesur\u00e9es \u00e0 partir du signal RMN entre les 12 forages dans 109 millions de cellules mesurant 150 m de longueur, 150 m de large et 5 m de hauteur. Les investigations dans les forages permettent de conna\u00eetre un volume d\u2019environ 20 m3. Ce volume r\u00e9ellement investigu\u00e9 repr\u00e9sente 1\/1000 d\u2019une cellule du mod\u00e8le, \u00e0 comparer aux 109 millions qu\u2019il faut contraindre&#8230;<\/p>\n<p style=\"text-align: justify;\">Cette calibration tr\u00e8s fine des calculs de perm\u00e9abilit\u00e9s \u00e0 partir des signaux RMN mesur\u00e9s en laboratoire et la mesure de la RMN sur 12 puits en diagraphie permettent d\u2019observer la distribution h\u00e9t\u00e9rog\u00e8ne de la porosit\u00e9 et de la perm\u00e9abilit\u00e9 depuis l\u2019\u00e9chelle ponctuelle dans les forages \u00e0 celle d\u2019un r\u00e9servoir de 400 km3 mod\u00e9lis\u00e9 en 3D.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;article intitul\u00e9 \u00ab\u00a0Characterization and origin of permeability-porosity heterogeneity in shallow-marine carbonates : from core scale to 3D reservoir dimension (Middle Jurassic, Paris Basin, France)\u00a0\u00bb par Benjamin Brigaud, Beno\u00eet Vincent, Christophe Durlet, Jean-Fran\u00e7ois Deconinck, Emmanuel Jobard, Niel Pickard, B\u00e9atrice Yven et Philippe Landrein est pr\u00eat pour une publication dans la revue Marine and Petroleum Geology. Un [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1181,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"gallery","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[75],"tags":[8,108,79,65,80],"class_list":["post-1034","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-article","tag-carbonate","tag-diagenese","tag-modelisation","tag-petrophysique","tag-stratigraphie","post_format-post-format-gallery","post-preview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Article - Mod\u00e9lisation 3D du sous-sol : de l\u2019\u00e9chelle microm\u00e9trique \u00e0 celle du r\u00e9servoir - benjamin brigaud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hebergement.universite-paris-saclay.fr\/brigaud\/1034\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Article - Mod\u00e9lisation 3D du sous-sol : de l\u2019\u00e9chelle microm\u00e9trique \u00e0 celle du r\u00e9servoir - benjamin brigaud\" \/>\n<meta property=\"og:description\" content=\"L&rsquo;article intitul\u00e9 \u00ab\u00a0Characterization and origin of permeability-porosity heterogeneity in shallow-marine carbonates : from core scale to 3D reservoir dimension (Middle Jurassic, Paris Basin, France)\u00a0\u00bb par Benjamin Brigaud, Beno\u00eet Vincent, Christophe Durlet, Jean-Fran\u00e7ois Deconinck, Emmanuel Jobard, Niel Pickard, B\u00e9atrice Yven et Philippe Landrein est pr\u00eat pour une publication dans la revue Marine and Petroleum Geology. 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