BL - BIB LEVEL: Analytic
IL - ILLUSTRATION: Refs: 7; 1 table, 3 plates.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute. Reference includes data from Instituto Geologico y Minero de Espana, Madrid, Spain
IS - ISSN: 0213-683X
CO - CODEN: #52651
AN - ACCESSION NUMBER: 2003-051288
UD - UPDATE CODE: 200316
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BK - BOOK TITLE: Geological controls on vegetation reflectance; an example from Middle Magdalena Basin, Colombia.
BA - BOOK AUTHORS: Baquero-Carlos-Mauricio
CP - COUNTRY OF PUBLICATION: United-States
PY - PUBLICATION YEAR: 2002
DG - DEGREE GRANTED: Master's
DI - DEGREE GRANTING INSTITUTION: Bowling Green State University. Bowling Green, OH, United States. Pages: 79. 2002.
LA - LANGUAGE: English
AB - ABSTRACT: In vegetated areas, the main factors that control the reflectance detected in a remote sensor are the topography and the vegetation itself. Underlying lithology influences the topography and, to some extent, the natural vegetation. In order to detect the potential relationship between lithology and reflectance, a Landsat 7 ETM+ image was multispectrally processed using GIS-produced ancillary data as spatial constraint. A series of classifications were performed using different combinations of input data sets, spatial domains, and classification schemes in the eastern border of Middle Magdalena Valley, a sedimentary basin in Colombia. The accuracy of each classification was assessed using a lithological map as reference data in the error matrices. Accuracy values were used to quantitatively compare the classifications and to identify the classification elements that have more control on the results. The classifications were designed by combination of three classification elements: classification scheme, input data set, and spatial domain. Classification scheme is the type of classification, input data set is the data to be classified, and spatial domain is the area where the classification is performed. The simplest combination (an unsupervised classification of a 6 non-thermal bands performed in the whole work area) is considered the standard because requires no previous knowledge of the area and less preprocessing in terms of area and type of bands. Any change in any classification element produced better values than the standard classification. On average, the highest overall accuracy was produced by a supervised classification (30 classes) of 6 non-thermal bands plus homogeneity filtered band 4, in the low vegetated portion of the work area. These 30 classes were agglomerated into 5 lithological classes by a new scheme developed in this thesis. This agglomeration scheme is automatic and purely based on quantitative constraints. The input data set with best performance was the one that employed information of the pixel variability in the band 4, the band that detects more leaf-transmitted energy. This thesis is dedicated to Alba Lucy, who encouraged and inspired me to complete this study.
DE - DESCRIPTORS: accuracy-; classification-; Colombia-; geographic-information-systems; information-systems; Landsat-; lithofacies-; lithostratigraphy-; Magdalena-Valley; outcrops-; reflectance-; remote-sensing; South-America; stratigraphic-units; vegetation-
CC - CATEGORY CODES: 12-Stratigraphy; 20-Applied-geophysics
DT - DOCUMENT TYPE: Thesis-or-Dissertation
BL - BIB LEVEL: Monograph
IL - ILLUSTRATION: Refs: 58; illus.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
AN - ACCESSION NUMBER: 2003-047746
UD - UPDATE CODE: 200315
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TI - TITLE: Recognizing a global stratigraphy.
AU - AUTHORS: Martin-Larry-D; Meehan-T-J
AF - AUTHOR AFFILIATION: University of Kansas, Natural History Museum, Lawrence, KS, United States
SO - SOURCE: TER-QUA Symposium Series - Institute for Tertiary-Quaternary Studies. 3; Pages 175-185. 2002.
PB - PUBLISHER: Nebraska Academy of Science. Lincoln, NE, United States. 2002.
CP - COUNTRY OF PUBLICATION: United-States
PY - PUBLICATION YEAR: 2002
LA - LANGUAGE: English
AB - ABSTRACT: Linnaean systematics lacked a unifying theory that adequately explained its success at an observational level, but this did not prevent it from being highly successful, and its theoretical base was later supplied by evolution. The idea of a global stratigraphy has had a similar history. Zones and stages are correlated regionally and to some extent globally. The North American Land Mammal "Ages" are another example on a continental scale. Observationally, these approaches have been surprisingly successful, suggesting a powerful underlying theoretical base (causal stratigraphy of Krassilov). It is also known that marine stages tend to be around six million years in duration. This pattern corresponds to van der Hammen's pollen stratigraphy of Colombia, Martin's expression of the North American Land Mammal "Ages," and Stout's climatic/sedimentary cycles of the North American midcontinent. The leaf emargination cycles of Wolfe also seem to be equivalent to marine stages or the biostratigraphic triplets of Martin and van der Hammen. We believe that this is the result of global climatic cycles, probably reflecting variations in solar activity, that form the basis of a global stratigraphy. Such a stratigraphy may represent equal or nearly equal units of time, as do other astronomical systems. Because present stratigraphic systems tend to be more local and carry their own historical baggage, we propose a new nomenclature based on the repetition of these units, in a sense, a calendar for earth history. We propose that the smaller stratigraphic unit of about two million years be called a vadh for T. van der Hammen, who first characterized it and recognized its importance. The relationship of the larger unit to a marine stage was well expressed by T. M. Stout and may be named a stout.
DE - DESCRIPTORS: biostratigraphy-; Cenozoic-; Chordata-; climate-change; cyclic-processes; global-; leaves-; Mammalia-; microfossils-; miospores-; paleoclimatology-; paleoecology-; palynomorphs-; Plantae-; pollen-; solar-cycles; stratigraphy-; Tetrapoda-; Vertebrata-
CC - CATEGORY CODES: 12-Stratigraphy
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
IL - ILLUSTRATION: Refs: 22; illus.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
CO - CODEN: #03404
AN - ACCESSION NUMBER: 2003-047590
UD - UPDATE CODE: 200315
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TI - TITLE: A warning model based on temporal changes of coda Q for volcanic activity at Nevado del Ruiz Volcano, Colombia.
AU - AUTHORS: Londono-John-M; Sudo-Yasuaki
SO - SOURCE: Bulletin of Volcanology. 64; 5, Pages 303-315. 2002.
PB - PUBLISHER: Springer International [for the] International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI). Heidelberg, International. 2002.
CP - COUNTRY OF PUBLICATION: International
PY - PUBLICATION YEAR: 2002
LA - LANGUAGE: English
DE - DESCRIPTORS: Andes-; coda-waves; Colombia-; elastic-waves; eruptions-; guided-waves; monitoring-; Nevado-del-Ruiz; precursors-; prediction-; Q-; seismic-waves; South-America; surface-waves; volcanic-risk; volcanoes-
CC - CATEGORY CODES: 24-Quaternary-geology
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
MC - MAP COORDINATES: LAT: N045300; N045300; LONG: W0752200; W0752200.
IL - ILLUSTRATION: Refs: 37; illus. incl. 2 tables.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
IS - ISSN: 0258-8900
CO - CODEN: BUVOEW
AN - ACCESSION NUMBER: 2003-046194
UD - UPDATE CODE: 200315
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TI - TITLE: The Plio-Pleistocene climatic record of the tropical Andes.
AU - AUTHORS: van-der-Hammen-Thomas
AF - AUTHOR AFFILIATION: University of Amsterdam, Hugo de Vries Laboratory, Amsterdam, Netherlands
SO - SOURCE: Journal of the Geological Society of London. 142, Part 3; Pages 483-489. 1985.
PB - PUBLISHER: Geological Society of London. London, United Kingdom. 1985.
CP - COUNTRY OF PUBLICATION: United-Kingdom
PY - PUBLICATION YEAR: 1985
LA - LANGUAGE: English
DE - DESCRIPTORS: absolute-age; Andes-; Angiospermae-; Cenozoic-; Colombia-; Compositae-; Dicotyledoneae-; Eastern-Cordillera; elevation-; fission-tracks; Gramineae-; Holocene-; isotopes-; K-Ar; lacustrine-environment; Lake-Fuquene; lake-sediments; last-glacial-maximum; microfossils-; Monocotyledoneae-; Neogene-; O-18; oxygen-; paleoclimatology-; paleoenvironment-; paleogeography-; palynomorphs-; Plantae-; Pleistocene-; Pliocene-; Quaternary-; relative-age; sediments-; South-America; Spermatophyta-; stable-isotopes; taxonomy-; temperature-; Tertiary-; topography-; tropical-environment
CC - CATEGORY CODES: 12-Stratigraphy
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
IL - ILLUSTRATION: Refs: 16; illus.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0016-7649
CO - CODEN: JGSLAS
AN - ACCESSION NUMBER: 2003-045128
UD - UPDATE CODE: 200314
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TI - TITLE: Cretaceous tholeiitic volcanic rocks from the Western Cordillera of Colombia; discussion and reply.
AU - AUTHORS: McCourt-W-J; Aspden-J-A; Millward-D; Marriner-G-F; Saunders-A-D
AF - AUTHOR AFFILIATION: British Geological Survey, GBR, United Kingdom
SO - SOURCE: Journal of the Geological Society of London. 142, Part 3; Pages 585-587. 1985.
PB - PUBLISHER: Geological Society of London. London, United Kingdom. 1985.
CP - COUNTRY OF PUBLICATION: United-Kingdom
PY - PUBLICATION YEAR: 1985
LA - LANGUAGE: English
DE - DESCRIPTORS: Andes-; basalts-; chemical-composition; chemical-ratios; Colombia-; Cretaceous-; deformation-; depositional-environment; Ecuador-; faults-; gabbros-; granites-; igneous-rocks; intrusions-; island-arcs; layered-intrusions; Mesozoic-; mid-ocean-ridge-basalts; ocean-floors; plate-tectonics; plutonic-rocks; sediments-; South-America; stratigraphic-units; subduction-; tholeiitic-composition; trenches-; volcanic-rocks; Western-Cordillera
CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
NN - ANNOTATION: For reference to original see Millward, D., et al., J. Geol. Soc. London, Vol. 141, p. 847-860, 1984.
IL - ILLUSTRATION: Refs: 18
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0016-7649
CO - CODEN: JGSLAS
AN - ACCESSION NUMBER: 2003-045122
UD - UPDATE CODE: 200314
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TI - TITLE: Comparacion de los flujos de nitrogeno y fosforo inorganicos disueltos en la Cienaga Grande de Santa Marta, Caribe Colombiano, obtenidos a partir de camaras de incubacion in situ e incubacion de nucleos de sedimento en laboratorio
Translated Title: Comparison of the dissolved inorganic nitrogen and phosphorus fluxes in Cienaga Grande de Santa Marta, Colombian Caribbean, obtained with in situ incubation chambers and sediment cores for laboratory incubation.
AU - AUTHORS: Navas-S-Gabriel-R; Zea-Sven; Campos-Nestor-Hernando
AF - AUTHOR AFFILIATION: INVEMAR, Instituto de Investigaciones Marinas y Costeras, Santa Marta, Colombia
SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 26; 101, Pages 519-531. 2002.
PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 2002.
CP - COUNTRY OF PUBLICATION: Colombia
PY - PUBLICATION YEAR: 2002
LA - LANGUAGE: Spanish
LS - LANGUAGE OF SUMMARY: English
AB - ABSTRACT: This research focused on the comparison of low cost methodologies to determine ionic nitrogen and phosphorous fluxes across the soft sediment-water interface in Cienaga Grande de Santa Marta. In situ transparent incubation chambers and sediment cores for laboratory incubation were employed. It was found that inside the incubation chambers a depletion of dissolved oxygen occurred thus the incubation can not be extended for more than six hours, time insufficiently to detect important variations in concentration of the analyzed ions. Furthermore in addition, chambers were difficult to handle. Twenty-four hour sediment core incubation in the laboratory did not have the above-mentioned problems. Oxygen concentration could be kept constant, and ion concentration changes were generally large enough to allow quantitative estimations of the fluxes.
DE - DESCRIPTORS: ammonium-ion; Caribbean-region; Cienaga-Grande-de-Santa-Marta; coastal-environment; Colombia-; concentration-; dissolved-materials; dissolved-oxygen; ecology-; lagoonal-environment; Magdalena-Colombia; nitrification-; nitrogen-; nutrients-; oxygen-; phosphate-ion; phytoplankton-; plankton-; Santa-Marta-Colombia; sediments-; South-America; wetlands-
CC - CATEGORY CODES: 22-Environmental-geology; 02A-General-geochemistry
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
MC - MAP COORDINATES: LAT: N104500; N110000; LONG: W0741000; W0743000.
IL - ILLUSTRATION: Refs: 40; illus. incl. sketch map.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0370-3908
CO - CODEN: RCCFAO
AN - ACCESSION NUMBER: 2003-044811
UD - UPDATE CODE: 200314
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TI - TITLE: Aspectos morfometricos y teoricos de un embalse tropical de alta montana; Represa La Fe, El Retiro, Colombia
Translated Title: Morphometry and theoretical aspects of a tropical high mountain freshwater reservoir; La Fe Dam, El Retiro, Antioquia.
AU - AUTHORS: Hernani-T-Alejandra; Ramirez-R-John-J
AF - AUTHOR AFFILIATION: Universidad de Antioquia, Instituto de Biologia, Medellin, Colombia
SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 26; 101, Pages 511-518. 2002.
PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 2002.
CP - COUNTRY OF PUBLICATION: Colombia
PY - PUBLICATION YEAR: 2002
LA - LANGUAGE: Spanish
LS - LANGUAGE OF SUMMARY: English
AB - ABSTRACT: Bathymetric and morphometric characteristics of La Fe reservoir are described. Theoretical predictions are derived from morphometric parameters and shape elements. The shore development index (F = 2,25) shows a more or less dendritic system. In accordance with the values of the volume development index (Dv = 1,05), La Fe reservoir has a conical basin, and slightly convex shape with several inflection points (SCx-micro). The values of relative depth (Dr = 2,07%) and effective fetch (L (sub f) = 5,9X10 (super -3) km) show a waterbody with a reduced road for the wind action and a considerable depth in the sampling point. It is predicted that La Fe reservoir is a freshwater system with thermal stability, considerable light penetration and allotrophy, low productivity, restricted mixing to first meters of water column and a littoral zone widely developed.
DE - DESCRIPTORS: Antioquia-Colombia; Colombia-; drainage-basins; ecology-; fresh-water; fresh-water-environment; highlands-; hydrology-; La-Fe-Dam; lacustrine-environment; landform-description; limnology-; morphometry-; South-America; surface-water; tropical-environment; water-resources
CC - CATEGORY CODES: 21-Hydrogeology
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
MC - MAP COORDINATES: LAT: N055900; N061200; LONG: W0752800; W0753500.
IL - ILLUSTRATION: Refs: 22; illus. incl. 2 tables.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0370-3908
CO - CODEN: RCCFAO
AN - ACCESSION NUMBER: 2003-044810
UD - UPDATE CODE: 200314
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TI - TITLE: Geomorfologia y unidades ecologicas del complejo de arrecifes de las Islas del Rosario e Isla Baru (Mar Caribe, Colombia)
Translated Title: Geomorphology and ecological units of Del Rosario Islands and Baru Island reef complexes; Caribbean Sea, Colombia.
AU - AUTHORS: Cendales-Maria-Helena; Zea-Sven; Diaz-Juan-Manuel
AF - AUTHOR AFFILIATION: Universidad Nacional de Colombia, Departamento de Biologia, Santa Marta, Colombia
SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 26; 101, Pages 497-510. 2002.
PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 2002.
CP - COUNTRY OF PUBLICATION: Colombia
PY - PUBLICATION YEAR: 2002
LA - LANGUAGE: Spanish
LS - LANGUAGE OF SUMMARY: English
AB - ABSTRACT: The thematic cartography of the reef biotopes of the Islas del Rosario archipelago and Isla Baru was complemented. The archipelago is an Holocene reef complex with terraces, fringing reefs and bank reefs, formed from the interaction between mud diapirism, relative sea level changes and reef growth. Marine ecological units correspond with the vertical reef zonation described for the continental Caribbean. There is a great extension of dead Acropora spp. among which several other kinds of organisms (mainly algae) develop. As a result, there has been a replacement of dominant species and changes in zonation patterns. Health of survivor species is moderate, being chronically affected by regional and local stress conditions.
DE - DESCRIPTORS: Atlantic-Ocean; Baru-Island; biota-; biotopes-; Caribbean-region; Caribbean-Sea; Cenozoic-; Colombia-; continental-shelf; Del-Rosario-Islands; ecology-; geomorphology-; habitat-; Holocene-; marine-terraces; North-Atlantic; Quaternary-; reefs-; sea-level-changes; shore-features; Sierra-Nevada-de-Santa-Marta; South-America
CC - CATEGORY CODES: 07-Oceanography
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
MC - MAP COORDINATES: LAT: N100700; N101700; LONG: W0753700; W0755200.
IL - ILLUSTRATION: Refs: 43; illus. incl. 2 tables, geol. sketch maps.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0370-3908
CO - CODEN: RCCFAO
AN - ACCESSION NUMBER: 2003-044809
UD - UPDATE CODE: 200314
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TI - TITLE: Las Calizas de Tetuan; una nueva unidad litoestratigrafica para la subcuenca de Neiva, Valle Superior del Magdalena; estratigrafia, petrografia y ambiente sedimentario
Translated Title: The Tetuan Limestone; a new lithostratigraphic unit for the Neiva Sub-basin, upper Magdalena Valley; stratigraphy, petrography, and sedimentary environment.
AU - AUTHORS: Pena-John-J; Annicchiarico-Giovanni-P; Jaramillo-Jose-M; Velasquez-Enrique
AF - AUTHOR AFFILIATION: Carrera 26, No. 6-38, Bogota, Colombia
SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 26; 101, Pages 481-496. 2002.
PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 2002.
CP - COUNTRY OF PUBLICATION: Colombia
PY - PUBLICATION YEAR: 2002
LA - LANGUAGE: Spanish
LS - LANGUAGE OF SUMMARY: English
AB - ABSTRACT: The term Tetuan Limestone is formally proposed in order to designate the inner part of the Villeta Group placed in the Neiva Sub-basin. The lithostratigraphic gap is defined from outcropping sequences in El Ocal, Itaibe and El Tobo streams where tree segments (I, II and III) are established. These segments are simultaneously correlated with four segments (A, B, C, and D) defined in subsoil through wireline logs. The regional aspects of the unit are documented with a map and four correlation sections. The sedimentary environment is proposed as an open carbonate platform (ramp); flooded by warm water and development during time of a transgressive cycle from the Middle Albian to the Upper one, over a pericratonic basin.
DE - DESCRIPTORS: Albian-; Andes-; biomicrite-; carbonate-rocks; Central-Cordillera; Colombia-; correlation-; Cretaceous-; description-; electrical-methods; electrical-properties; geophysical-methods; geophysical-surveys; Huilla-Colombia; limestone-; lithofacies-; lithostratigraphy-; Lower-Cretaceous; Magdalena-Valley; Mesozoic-; Neiva-Basin; nomenclature-; paleoenvironment-; sea-level-changes; sedimentary-rocks; South-America; stratotypes-; surveys-; Tetuan-Limestone; Tolima-Colombia; transgression-; type-localities; Villeta-Group
CC - CATEGORY CODES: 12-Stratigraphy; 20-Applied-geophysics
DT - DOCUMENT TYPE: Serial
BL - BIB LEVEL: Analytic
MC - MAP COORDINATES: LAT: N020000; N040000; LONG: W0740000; W0760000.
IL - ILLUSTRATION: Refs: 34; illus. incl. strat. cols., sketch map.
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0370-3908
CO - CODEN: RCCFAO
AN - ACCESSION NUMBER: 2003-044808
UD - UPDATE CODE: 200314
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TI - TITLE: Fracture patterns in the Guaduas Formation and its relationship with the coal-bed methane, Colombia.
AU - AUTHORS: Velez-Beatriz; Rueda-Edgar
AF - AUTHOR AFFILIATION: Consorcio GyG, Bucaramanga, Colombia
BK - BOOK TITLE: In: American Association of Petroleum Geologists 2001 annual meeting.
BA - BOOK AUTHORS: Anonymous
SO - SOURCE: Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists. 2001; Pages 207. 2001.
PB - PUBLISHER: American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists. Tulsa, OK, United States. 2001.
CP - COUNTRY OF PUBLICATION: United-States
PY - PUBLICATION YEAR: 2001
CN - CONFERENCE INFORMATION: American Association of Petroleum Geologists 2001 annual meeting. Denver, CO, United States. June 3-6, 2001.
LA - LANGUAGE: English
DE - DESCRIPTORS: balanced-cross-sections; Checua-Lenguazaque-Syncline; coalbed-methane; Colombia-; cross-sections; deformation-; folds-; fractures-; geometry-; Guadas-Formation; kinematics-; mechanism-; migration-; natural-gas; naturally-fractured-reservoirs; patterns-; petroleum-; petroleum-accumulation; petroleum-exploration; South-America; strike-; structural-controls; synclines-; tectonics-; three-dimensional-models
CC - CATEGORY CODES: 29A-Economic-geology,-geology-of-energy-sources
DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document
BL - BIB LEVEL: Analytic
RF - REFERENCE SOURCE: GeoRef, Copyright 2003, American Geological Institute.
IS - ISSN: 0094-0038
CO - CODEN: APGAB2
AN - ACCESSION NUMBER: 2003-044756
UD - UPDATE CODE: 200314
Registro 347 de 5614 - GeoRef : 2002-2004/12
TI - TITLE: Stratigraphy-guided rock-physics reservoir characterization.
AU - AUTHORS: Gutierrez-Mario-A; Dvorkin-Jack; Nur-Amos
AF - AUTHOR AFFILIATION: Stanford University, Stanford, CA, United States
BK - BOOK TITLE: In: American Association of Petroleum Geologists 2001 annual meeting.
BA - BOOK AUTHORS: Anonymous
SO - SOURCE: Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists. 2001; Pages 77. 2001.
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