No. Registros Solicitud 1 5614 colombia
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DE - DESCRIPTORS: absolute-age; Aburra-Valley; Altavista-Stock; Amaga-Stock; Antioqueno-Batholith; Antioquia-Colombia; areal-geology; Arquia-Complex; basins-; batholiths-; Cenozoic-; Colombia-; complexes-; Cretaceous-; dates-; deformation-; dunite-; faults-; field-trips; geomorphology-; guidebook-; Honda-Stock; igneous-rocks; intrusions-; K-Ar; lithostratigraphy-; mafic-composition; Medellin-Colombia; Mesozoic-; metamorphic-rocks; ophiolite-; ophiolite-complexes; Paleozoic-; peridotites-; plutonic-rocks; pull-apart-basins; Quaternary-; Quebradagrande-Complex; San-Diego-Stock; sediments-; South-America; stratigraphic-units; tectonics-; ultramafics- CC - CATEGORY CODES: 13-Areal-geology DT - DOCUMENT TYPE: Serial BL - BIB LEVEL: Analytic MC - MAP COORDINATES: LAT: N060000; N062500; LONG: W0752500; W0754500. IL - ILLUSTRATION: Refs: 42; geol. sketch map. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. IS - ISSN: 0120-3630 CO - CODEN: #01536 AN - ACCESSION NUMBER: 2005-014568 UD - UPDATE CODE: 200506 Registro 817 de 5614 - GeoRef : 2005/01-2005/07 TI - TITLE: La diversidad del relieve y los suelos en el altiplano de Santa Rosa de Osos (Antioquia); sus significados ambientales Translated Title: Geomorphologic diversity and soils of the Santa Rosa de Osos Plateau (Antioquia, Colombia); paleoenvironmental implications. AU - AUTHORS: Arias-L-Luis-Alberto; Gonzalez-Luis-Hernan-S AF - AUTHOR AFFILIATION: Universidad Nacional de Colombia, Escuela de Geociencias, Medellin, Colombia SO - SOURCE: Boletin de Ciencias de la Tierra. 15; Pages 51-72. 2003. PB - PUBLISHER: Universidad Nacional de Colombia, Departamento de Ciencias de la Tierra, Facultad de Ciencias. Medellin, Colombia. 2003. CP - COUNTRY OF PUBLICATION: Colombia PY - PUBLICATION YEAR: 2003 LA - LANGUAGE: Spanish LS - LANGUAGE OF SUMMARY: English AB - ABSTRACT: The geomorphic structure of Central cordillera in Antioquia department of Colombia consists of a mosaic of first order landforms: uplifted etchplains, regional scraps, linear and branched canyons and the "Aburra valley as an intramontane basin. Etchplains and regional scarps are spatially arranged as stepped patterns; lineal and branched canyons correspond to the youngest first order generation in the Colombian Central range and they are modelled simultaneously with the final Colombian north cordillera uplift. The Aburra valley is a unique type relief, not only on the northern of the Central cordillera but for all the Colombian Andes. The Santa Rosa de Osos etchplain is distinguished from the others stepped etchplains by the preservation of old (Tertiary) relief types, relief elements, landforms and soils. DE - DESCRIPTORS: Aburra-Valley; Andes-; Antioquia-Colombia; basins-; canyons-; Central-Cordillera; Colombia-; erosion-; erosion-features; fluvial-features; geomorphology-; horizons-; hydrology-; inselbergs-; intermontane-basins; landforms-; metamorphic-rocks; metasedimentary-rocks; pedogenesis-; Penoles-Colombia; physical-properties; plateaus-; rainfall-; relief-; rivers-; San-Pedro-de-los-Milagros-Colombia; Santa-Rosa-de-Osos-Plateau; scarps-; soil-profiles; soils-; South-America; uplifts-; valleys-; weathering- CC - CATEGORY CODES: 23-Geomorphology; 25-Soils DT - DOCUMENT TYPE: Serial BL - BIB LEVEL: Analytic NN - ANNOTATION: Includes appendices. IL - ILLUSTRATION: Refs: 18 RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. IS - ISSN: 0120-3630 CO - CODEN: #01536 AN - ACCESSION NUMBER: 2005-014567 UD - UPDATE CODE: 200506 Registro 818 de 5614 - GeoRef : 2005/01-2005/07 TI - TITLE: Geologia de las cordilleras Central y Occidental de Colombia entre Medellin, Ciudad Bolivar y el rio Arquia, Departamento de Antioquia Translated Title: Geology of the Central and Western cordilleras between Medellin, Ciudad Bolivar, and the Arquia River; Antioquia, Colombia. AU - AUTHORS: Gonzalez-Iregui-Humberto AF - AUTHOR AFFILIATION: Universidad Nacional de Colombia, Escuela de Geociencias y Medio Ambient, Medellin, Colombia SO - SOURCE: Boletin de Ciencias de la Tierra. 15; Pages 31-45 ; 2 sheets. 2003. PB - PUBLISHER: Universidad Nacional de Colombia, Departamento de Ciencias de la Tierra, Facultad de Ciencias. Medellin, Colombia. 2003. CP - COUNTRY OF PUBLICATION: Colombia PY - PUBLICATION YEAR: 2003 LA - LANGUAGE: Spanish LS - LANGUAGE OF SUMMARY: English AB - ABSTRACT: The field trip of the Medellin-Ciudad Bolivar-Arquia river route, within the Antioquia Department, enables a general view of the geological features of the northernmost Central and Western Cordilleras, particularly the geological characteristics and structural position of different lithostratigraphic units, relative to the main faults systems that mark the boundary between a continental environment to the east and an oceanic environment to the west, and their incidence on the tectonic models formulated for this area of Colombia. The Medellin-Ciudad Bolivar section between the western flank of the Central Cordillera and the eastern flank of the Occidental Cordillera, near the Cauca-Patia depression, shows the spatial-structural relationships between the Paleozoic metamorphic rocks and the Mesozoic oceanic rocks along the Silvia-Pijao an the Cauca-Almaguer fault systems. In the Cauca river canyon, between the Arquia river and municipality of La Pintada, and in the western flank of the Central Cordillera, between La Pintada and Medellin, the Paleozoic medium pressure (Arquia Complex) and low pressure (Sinifana metasediments and Cajamarca complex) metamorphic rocks are separated tectonically from each other by Cretaceous oceanic volcano-sedimentary rocks (Quebradagrande Complex). These units are separated from west to east by the Cauca-Almaguer, Silvia-Pijao and San Jeronimo fault systems. DE - DESCRIPTORS: Amaga-Formation; Andes-; Antioquia-Colombia; areal-geology; Arquia-Complex; Arquia-River; Cajamarca-Complex; Cauca-River; Cauca-Almaguer-Fault; Cenozoic-; Central-Cordillera; Ciudad-Bolivar-Colombia; Colombia-; Combia-Formation; Cretaceous-; cross-sections; crust-; deformation-; depositional-environment; facies-; faults-; field-trips; geologic-maps; geotraverses-; granites-; igneous-rocks; intrusions-; La-Pintada-River; lithostratigraphy-; maps-; Medellin-Colombia; Mesozoic-; metamorphic-rocks; Neogene-; oceanic-crust; ophiolite-; paleoenvironment-; Paleozoic-; petrography-; plutonic-rocks; Quebradagrande-Complex; San-Jeronomio-Fault; sedimentary-rocks; sedimentation-; Silvia-Pijao-Fault; South-America; stratigraphic-units; systems-; tectonics-; Tertiary-; Western-Cordillera CC - CATEGORY CODES: 13-Areal-geology DT - DOCUMENT TYPE: Serial; Map BL - BIB LEVEL: Analytic MC - MAP COORDINATES: LAT: N054500; N063000; LONG: W0750000; W0760000. MS - MAP SCALE: 1:333,333 MP - MAP TYPE: color-geologic-maps IL - ILLUSTRATION: Refs: 23; sects., sketch map. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. IS - ISSN: 0120-3630 CO - CODEN: #01536 AN - ACCESSION NUMBER: 2005-014566 UD - UPDATE CODE: 200506 Registro 819 de 5614 - GeoRef : 2005/01-2005/07 TI - TITLE: Geologia de los marmoles de la concesion minera Rio Claro de Sumicol S.A. Translated Title: Geology of the Rio Claro marble deposits, Antioquia, Colombia. AU - AUTHORS: Tobon-Jorge-Ivan; Aristizabal-Edier-Vicente; Arango-Ivan-Dario AF - AUTHOR AFFILIATION: Universidad Nacional de Colombia, Escuela de Geociencias y Medio Ambiente, Medellin, Colombia SO - SOURCE: Boletin de Ciencias de la Tierra. 15; Pages 23-30. 2003. PB - PUBLISHER: Universidad Nacional de Colombia, Departamento de Ciencias de la Tierra, Facultad de Ciencias. Medellin, Colombia. 2003. CP - COUNTRY OF PUBLICATION: Colombia PY - PUBLICATION YEAR: 2003 LA - LANGUAGE: Spanish LS - LANGUAGE OF SUMMARY: English AB - ABSTRACT: This work was made inside the boundaries of the Rio Claro Mining Concession of SUMICOL S.A., in an area of 9 km (super 2) , located at the Southeast of the Antioquia Department in the eastern flank of the Central Cordillera. As result of the field observations and petrographic, geochemical, structural and lithologies analyses made by the authors, we propose the following geological model: The marbles of the Rioclaro Mining Concession, which are considered to be Paleozoic, were formed by primary deposition under a transitional environment. In the east part of the basin rich minerals in calcium with low continental contribution were deposited, while in the west part, due to temporary and physiographic variations of the paleobasin, intercalations of calcareous, dolomitic and quarzitic bodies were formed. These materials were subsequently affected by tectonometamorphic events during the Paleozoic and by the Palestina fault system in the Cretaceous, moving the highly pure marbles, initially located on the east, to the southwest by the principal trace of the Palestina fault. The principal evidences are the large amount of calcium oxide and the compositional difference between the calcareous materials limited by the Palestina fault inside the study area. In the south of such an structure there were found highly pure marbles with amounts of CaCO (sub 3) above 98% and oxides below 0.52%, while according to the regional geological model these materials should be on the east side of the marble body. DE - DESCRIPTORS: Andes-; Antioquia-Colombia; Cano-Seco-Fault; Central-Cordillera; chemical-composition; Colombia-; Cretaceous-; deformation-; depositional-environment; faults-; geochemistry-; geomorphology-; lithostratigraphy-; mapping-; marble-deposits; marbles-; Mesozoic-; metamorphic-rocks; metasedimentary-rocks; mineral-assemblages; mineral-composition; models-; paleoenvironment-; Paleozoic-; Palestina-Fault; petrography-; Puerto-Triunfo-Colombia; Rio-Claro-Deposit; San-Francisco-Colombia; San-Luis-Colombia; sedimentation-; Sonson-Colombia; South-America; spectra-; stratigraphic-units; systems-; tectonics-; X-ray-fluorescence-spectra CC - CATEGORY CODES: 28A-Economic-geology,-geology-of-nonmetal-deposits; 05A-Igneous-and-metamorphic-petrology DT - DOCUMENT TYPE: Serial BL - BIB LEVEL: Analytic MC - MAP COORDINATES: LAT: N053000; N063000; LONG: W0733000; W0744500. IL - ILLUSTRATION: Refs: 15; illus. incl. geol. sketch map. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. IS - ISSN: 0120-3630 CO - CODEN: #01536 AN - ACCESSION NUMBER: 2005-014565 UD - UPDATE CODE: 200506 Registro 820 de 5614 - GeoRef : 2005/01-2005/07 TI - TITLE: Estratigrafi secuencial de la formacion Amaga Translated Title: Sequence stratigraphy of the Amaga Formation, Colombia. AU - AUTHORS: Sierra-L-Gloria-Maria; Silva-T-Juan-Carlos; Correa-Luis-Gabriel AF - AUTHOR AFFILIATION: Universidad EAFIT, Departamento de Geologia, COL, Colombia SO - SOURCE: Boletin de Ciencias de la Tierra. 15; Pages 9-22. 2003. PB - PUBLISHER: Universidad Nacional de Colombia, Departamento de Ciencias de la Tierra, Facultad de Ciencias. Medellin, Colombia. 2003. CP - COUNTRY OF PUBLICATION: Colombia PY - PUBLICATION YEAR: 2003 LA - LANGUAGE: Spanish LS - LANGUAGE OF SUMMARY: English AB - ABSTRACT: Located in the western flank of the Central Cordillera of Colombia and having a thickness of approximately 750 m, the Upper Oligocene-Upper Miocene Amaga Formation is divided into two members: the Lower Member, presenting facies associations typical of braided and meandering rivers; and subdivided into Unit 1 and Unit 2, sequentially shows increase in preservation grade of geomorphic elements, sedimentary facies diversity and textural and chemical maturity of sandstone. Compositionally Unit 1 presents conglomeratic quartz arenites and Unit 2 presents well-sorted sub-lithic arenites associated to coal bearings. The Upper Member, presenting facies associations of meandering and braided rivers, is subdivided into Unit 3 and Unit 4. This member shows low geomorphic elements preservation grade, as well as a decrease in facies diversity and textural and chemical maturity of sandstone. Compositionally, this member holds volcanic clastic fragments and feldspatic-lithic arenites. These characteristics were used to define stratigraphic base level fluctuations, throughout which, it was possible to identify changes in the Accommodation space-Sediment supply (A/S) relationship. This relationship permitted the determination of three different sedimentation patterns characterized by: (1) High tectonic activity, with the low A/S relationship (Unit 1); (2) low tectonic activity and high climatic influence, with a moderate high A/S relationship (Unit 2) and (3) high tectonic activity, contemporaneous to Combia Formation Volcanism (Units 3 and 4), with the lowest A/S relationship. DE - DESCRIPTORS: Amaga-Colombia; Amaga-Formation; Amaga-Stock; Andes-; Antioquia-Colombia; Arquia-Complex; Ayura-Montebello-Group; braided-streams; Canasgordas-Group; Cenozoic-; Central-Cordillera; Colombia-; Combia-Formation; Cretaceous-; depositional-environment; facies-; Fredonia-Colombia; granites-; Heliconia-complex; igneous-rocks; intrusions-; lithostratigraphy-; lower-Miocene; mapping-; Mesozoic-; metamorphic-rocks; mineral-composition; Miocene-; Neogene-; Oligocene-; ophiolite-; ophiolite-complexes; Paleogene-; Paleozoic-; petrography-; plutonic-rocks; provenance-; Pueblito-Diorite; Quebragrande-Formation; sedimentary-rocks; sedimentation-; sequence-stratigraphy; South-America; stocks-; streams-; tectonics-; Tertiary-; Titiribi-Colombia; upper-Oligocene; Venecia-Colombia CC - CATEGORY CODES: 12-Stratigraphy; 06A-Sedimentary-petrology DT - DOCUMENT TYPE: Serial BL - BIB LEVEL: Analytic MC - MAP COORDINATES: LAT: N055500; N061000; LONG: W0754000; W0755000. IL - ILLUSTRATION: Refs: 41; illus. incl. 1 table, geol. sketch map. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. IS - ISSN: 0120-3630 CO - CODEN: #01536 AN - ACCESSION NUMBER: 2005-014564 UD - UPDATE CODE: 200506 Registro 821 de 5614 - GeoRef : 2005/01-2005/07 TI - TITLE: Colombian vegetation at the last glacial maximum; a comparison of model- and pollen-based biome reconstructions. AU - AUTHORS: Marchant-Robert; Boom-Arnoud; Behling-Hermann; Hooghiemstra-Henry; Melief-Bert; van-Geel-Bas; van-der-Hammen-Thomas; Wille-Michael AF - AUTHOR AFFILIATION: Trinity College Dublin, Department of Botany, Dublin, Ireland BK - BOOK TITLE: In: Late Quaternary ecosystem dynamics and carbon cycling in the tropics. BA - BOOK AUTHORS: Coxon-P (editor); Mayle-Francis-E (editor) SO - SOURCE: JQS. Journal of Quaternary Science. 19; 7, Pages 721-732. 2004. PB - PUBLISHER: John Wiley and Sons for the Quaternary Research Association. Chichester, United Kingdom. 2004. CP - COUNTRY OF PUBLICATION: United-Kingdom PY - PUBLICATION YEAR: 2004 CN - CONFERENCE INFORMATION: 16th INQUA congress, symposium on Late Quaternary ecosystem dynamics and carbon cycling in the tropics. Reno, NV, United States. July 23-30, 2003. LA - LANGUAGE: English AB - ABSTRACT: Colombian vegetation, at the ecological level of the biome, is reconstructed at the Last Glacial Maximum (LGM) using two methods. A reconstruction of modern biomes shows that, for the majority of the sites, the pollen data accurately reflect the potential vegetation, even though much of the original vegetation has been transformed by agricultural practices. At 18 000 (super 14) C yr BP a generally cool and dry environment is reflected in biome assignments of cold mixed forests, cool evergreen forests and cool grassland/shrub, the latter extending to lower altitudes than presently recorded. Differential responses of the vegetation to climatic shifts are related to changes in moisture sources and the importance of edaphic control on the vegetation. Secondly, biomes at the LGM are also investigated by applying a vegetation model (BIOME-3) set to operate at CO (sub 2) levels of 200 ppmV and with climatic data from 12 meteorological stations that encompass a range of environments within Colombia. At lower altitudes it is apparent that moisture is the dominant control on driving vegetation change whereas temperature becomes more important at higher altitudes. The combined reconstruction of biome-scale vegetation dynamics in Colombia allows an understanding of the environmental controls on these to be developed that demonstrates the need to invoke different factors to explain the vegetation change rather than a uniform reduction in temperature or moisture. Abstract Copyright (2004), Wiley Periodicals, Inc. DE - DESCRIPTORS: altitude-; BIOME-3; biomes-; Cenozoic-; climate-change; climate-forcing; Colombia-; cooling-; data-processing; digital-simulation; last-glacial-maximum; microfossils-; miospores-; numerical-models; paleoclimatology-; paleoecology-; palynomorphs-; Plantae-; Pleistocene-; pollen-; pollen-analysis; Quaternary-; reconstruction-; South-America; tropical-environment; upper-Pleistocene; vegetation- CC - CATEGORY CODES: 24-Quaternary-geology DT - DOCUMENT TYPE: Serial; Conference-Document BL - BIB LEVEL: Analytic IL - ILLUSTRATION: Refs: 107; illus. incl. 3 tables, sketch maps. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom IS - ISSN: 0267-8179 AN - ACCESSION NUMBER: 2005-013803 UD - UPDATE CODE: 200506 Registro 822 de 5614 - GeoRef : 2005/01-2005/07 BK - BOOK TITLE: Mapa geologico; plancha 38 El Carmen de Bolivar Translated Title: Geologic map; Plate 38; El Carmen de Bolivar. BA - BOOK AUTHORS: Hernandez-Roberto (compiler); Guzman-Georgina-O (compiler) PB - PUBLISHER: INGEOMINAS. Bogata, Colombia. Pages: 1 sheet. 1995. CP - COUNTRY OF PUBLICATION: Colombia PY - PUBLICATION YEAR: 1995 LA - LANGUAGE: Spanish DE - DESCRIPTORS: areal-geology; Colombia-; El-Carmen-de-Bolivar-map-sheet; geologic-maps; maps-; South-America; stratigraphic-units CC - CATEGORY CODES: 14-Geologic-maps DT - DOCUMENT TYPE: Map BL - BIB LEVEL: Monograph MS - MAP SCALE: 1:100,000 MP - MAP TYPE: color-geologic-maps IL - ILLUSTRATION: illus. incl. sect., strat. col. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. AN - ACCESSION NUMBER: 2005-013149 UD - UPDATE CODE: 200506 Registro 823 de 5614 - GeoRef : 2005/01-2005/07 BK - BOOK TITLE: Mapa geologico; plancha 152 Soata Translated Title: Geologic map; Plate 152; Soata. BA - BOOK AUTHORS: Vargas-H-Rodrigo (compiler); Arias-T-Alfonso (compiler); Jaramillo-C-Luis (compiler); Tellez-I-Noel (compiler) PB - PUBLISHER: INGEOMINAS. Bogata, Colombia. Pages: 1 sheet. 1987. CP - COUNTRY OF PUBLICATION: Colombia PY - PUBLICATION YEAR: 1987 LA - LANGUAGE: Spanish DE - DESCRIPTORS: areal-geology; Colombia-; geologic-maps; maps-; Soata-map-sheet; South-America; stratigraphic-units CC - CATEGORY CODES: 14-Geologic-maps DT - DOCUMENT TYPE: Map BL - BIB LEVEL: Monograph MC - MAP COORDINATES: LAT: N060500; N063000; LONG: W0723500; W0730000. MS - MAP SCALE: 1:100,000 MP - MAP TYPE: color-geologic-maps IL - ILLUSTRATION: illus. incl. sect., strat. col. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. AN - ACCESSION NUMBER: 2005-013148 UD - UPDATE CODE: 200506 Registro 824 de 5614 - GeoRef : 2005/01-2005/07 TI - TITLE: Geomorphological and sedimentological study of Providencia and Santa Catalina (Colombia) reef complex. AU - AUTHORS: Gayet-Jacques; Vernette-Georges; Eluyar-Marc; Molina-Amparo AF - AUTHOR AFFILIATION: Universite de Bordeaux I, CIBAMAR, Talence, France BK - BOOK TITLE: In: 14th international sedimentological congress; abstracts. BA - BOOK AUTHORS: Mabesoone-Jannes-M (chairperson) SO - SOURCE: International Sedimentological Congress. 14; Pages D36-D37. 1994. PB - PUBLISHER: International Association of Sedimentologists, Comparative Sedimentology Division. Utrecht, Netherlands. 1994. CP - COUNTRY OF PUBLICATION: Netherlands PY - PUBLICATION YEAR: 1994 CN - CONFERENCE INFORMATION: 14th international sedimentological congress. Recife, Brazil. Aug. 1994. LA - LANGUAGE: English DE - DESCRIPTORS: Atlantic-Ocean; barrier-reefs; bioclastic-sedimentation; calcium-carbonate; carbonate-sediments; carbonates-; Caribbean-region; Caribbean-Sea; Colombia-; lagoons-; North-Atlantic; pellets-; pinnacle-reefs; Providencia-Island; reefs-; Santa-Catalina-Island; sedimentation-; sediments-; shore-features; South-America CC - CATEGORY CODES: 07-Oceanography DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document BL - BIB LEVEL: Analytic MC - MAP COORDINATES: LAT: N130000; N133500; LONG: W0800000; W0802500. IL - ILLUSTRATION: Refs: 4; sketch map. RF - REFERENCE SOURCE: GeoRef, Copyright 2005, American Geological Institute. CO - CODEN: #03249 AN - ACCESSION NUMBER: 2005-011957 UD - UPDATE CODE: 200505 Registro 825 de 5614 - GeoRef : 2005/01-2005/07 BK - BOOK TITLE: Lithology and fluid seismic determination for the Acae area, Puerto Colon oil field, Colombia. BA - BOOK AUTHORS: Gomez-Frank-Harvey CP - COUNTRY OF PUBLICATION: United-States PY - PUBLICATION YEAR: 2003 DG - DEGREE GRANTED: Master's DI - DEGREE GRANTING INSTITUTION: University of Oklahoma. Norman, OK, United States. Pages: 82. 2003. LA - LANGUAGE: English AB - ABSTRACT: This thesis work applies recently enhanced geophysical techniques with the purpose of assisting the management effort of detecting new prospecting zones in the Puerto Colon oil field. Currently, only the easier-to-produce hydrocarbons are being extracted; this thesis attempts to discover more about the Caballos formation characteristics in order to extract the harder-to-produce hydrocarbons. Acceptable matches have been found between the rockphysics laboratory measurements and the petrophysical properties estimated with seismic data. Well logs were used to guide the seismic calculations in the estimation of both porosity and gamma-ray response (from seismic attributes), and acoustic impedance (via seismic inversion) using a neural network approach. A probabilistic neural network (PNN) was applied because of three characteristics: a) mapping non-linear relationships between seismic and well log data; b) incrementing both accuracy and resolution when performing inversion, compared to conventional inversion (Sun, 2001); and using a mathematical interpolation scheme not implemented as a black box (Hampson et al., 2001; Masters, 1995; Specht, 1990, 1991). The elastic parameters Poisson and Vp/Vs ratio were identified as important to discriminate between good and low reservoir rock quality in the Caballos formation (Petrophysical Consulting Inc., 2000). Elastic inversion was applied to the seismic data to calculate these elastic parameters using the Portniaguine's algorithm (2003, personal communication). The inputs to the portniaguine's elastic inversion algorithm are three angle gather stacks (0 degrees -10 degrees , 11 degrees -20 degrees and 21 degrees -30 degrees ). The possibility of detecting the four genetical units of the Caballos Formation was evaluated using tuning analysis technique and instantaneous spectral analysis (ISA) (Castagna et al., 2003); no reflections from these units were detectable for the 4 millisecond sample rate seismic data available. Frequency cubes generated by applying ISA and partial offset stacks (near, middle and far offsets) proved to be useful techniques in creating external attributes used as input for the porosity and gamma-ray response estimation; additionally the 40 hertz frequency cube is very appropriate for the localization of the faulting area that limits the eastern side of the oil field. Finally, to evaluate the impact of the reservoir fluids in the seismic signature a fluid replacement modeling and preliminary amplitude versus offset analysis was performed. No substantial contribution of the fluids to the seismic signature was detected. Yüklə 20,82 Mb. Dostları ilə paylaş:
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