No. Registros Solicitud 1 5614 colombia

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1303. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: Palynofacies and lithofacies from seven stratigraphic sections from the Cretaceous and Quaternary of Colombia, and the Paleogene of the U.S. Gulf Coast were used to reconstruct paleobathymetric and relative sea level curves for these stratigraphic Intervals. These curves were compared with those produced by other techniques. Our palynological methodology consists of two major components: a palynofacies analysis and a paleoecological Interpretation of palynomorph assemblages. The palynofacies analysis includes three main steps: first, 300 organic matter particles are counted in each sample recording composition, size, sorting and degradation. The second step involves the statistical treatment of the recorded data. Under the assumption of a dominance of allocyclic processes, the clustered samples are ordered according to their organic matter content, which indicate their positions relative to the paleoshoreline. The last step consists of constructing the relative paleobathymetric curve based on the composition and relative change of the palynofacies groups along the studied stratigraphic section. The second major component involves the paleoecological analysis of dinoflagellates, pollen and spores. Taxa are clustered according to several statistical treatments and the paleoecological significance of each group is interpreted based on the current literature. When correlating several sections, clusters from every section are compared to obtain strong paleoecological associations that mainly reflect a position relative to the shoreline. This proposed technique is useful either in continental rocks or in marine rocks, increasing the potential for successful basin-wide correlation. Furthermore, it can be used in sediments as old as Carboniferous.

DE - DESCRIPTORS: biofacies-; Cenozoic-; Colombia-; correlation-; Cretaceous-; cycles-; degradation-; Gulf-Coastal-Plain; lithofacies-; Mesozoic-; microfossils-; models-; organic-compounds; organic-materials; paleobathymetry-; paleoecology-; palynomorphs-; processes-; Quaternary-; sea-level-changes; sorting-; South-America; statistical-analysis

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1996-072077

UD - UPDATE CODE: 199622

Registro 4650 de 5614 - GeoRef Disc 4: 1993-1996

TI - TITLE: Comparison of the timing of hydrocarbon generation for major petroleum source rocks in North and South America.

AU - AUTHORS: Jarvie-D-M; Wavrek-D

AF - AUTHOR AFFILIATION: Humble Instruments & Services, Humble Geochemical Services Division, Humble, TX, United States

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1303-1304. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: The timing of hydrocarbon generation is an essential component in assessing the critical moment in the petroleum systems approach. World class petroleum source rocks from North and South America were evaluated to determine their rates of decomposition into hydrocarbons. The kinetics of hydrocarbon generation for the Villeta-Caballos(!) and Barnett (!) petroleum systems were evaluated in detail. Comparison of kerogen decomposition rates of petroleum source rocks reveals relative temperature and maturity differences for the onset of and peak hydrocarbon generation based on an arbitrary constant heating rate model of 3.3 degrees C/million years. These differences reflect differences in composition and structure of source material which will affect the composition of the oil and gas generated from these sources. These data may be used to establish the critical moment limits.

DE - DESCRIPTORS: Argentina-; Barnett-Formation; Cacheuta-Formation; Carboniferous-; Cenozoic-; Colombia-; Cretaceous-; Eocene-; genesis-; Green-River-Formation; Jurassic-; kerogen-; kinetics-; La-Luna-Formation; maturity-; Mesozoic-; Miocene-; Mississippian-; models-; Monterey-Formation; Neogene-; North-America; organic-compounds; organic-materials; Paleogene-; Paleozoic-; petroleum-; Portlandian-; source-rocks; South-America; temperature-; Tertiary-; Tithonian-; United-States; Upper-Cretaceous; Upper-Jurassic; Vaca-Muerta-Formation; Venezuela-; Villeta-Formation

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 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1996-072078

UD - UPDATE CODE: 199622

Registro 4651 de 5614 - GeoRef Disc 4: 1993-1996

TI - TITLE: Structural styles of the foldbelt associated to the Maranon-Oriente-Putumayo (MOP) foreland basins.

AU - AUTHORS: Kendall-Jerome-J; Aleman-Antenor-M; Guerra-Jaime

AF - AUTHOR AFFILIATION: Mobil New Business Development, Dallas, TX, United States

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1305. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: Along strike variations in structural style of the foldbelt associated with the MOP basins reflect changes in mechano-stratigraphy and cross sectional taper in space and time. Oblique convergence of the Farallon/Nazca and South America plates accounts for strain partitioning along the foldbelt and significant orogen parallel strike slip faulting. Inversion of Jurassic grabens was coeval with compressional deformation along the entire foldbelt. In the Colombia-Ecuador segment, the late Senonian Peruvian phase of the Andean Orogeny was dominated by thin-skinned deformation coeval with collision of allochthonous terranes along the Peltetec Fault. The buttressing effect of the Jurassic plutons along the Cosanga/Mendez Fault accounts for changes in deformation to thick-skinned style from Middle Eocene (Incaic Phase) onward (Quechua Phase). Near to the Peru-Ecuador border the margin changed southward to an arc-trench system. Deformation also changed from basement involved near and along the "Maranon Geanticline" during Late Cretaceous and Paleogene to a salt related fold and thrust belt from Late Miocene onward. salt. Seismic data in the Santiago and Huallaga foldbelts documents outward and lateral salt movement since Mesozoic enhanced by Jurassic extension and by Late Cretaceous to Paleogene molasse deposition. Late Miocene/Pliocene compressional deformation partially overprinted these early salt structures. Folding is characterized by anticlinal thickening and synclinal thinning of the salt and faulting is dominated by back thrusts with diffuse forward vergent thrusts. Salt piercement accounts for narrow periclinal structures and enlargement of pre-existing broad synclines. The frontal thrust is characterized by box-folds, overturned folds and upright folds above a major salt core. There is a lack of a preferred structural vergence of ramps and folds.

DE - DESCRIPTORS: allochthons-; Andean-Orogeny; anticlines-; basins-; Cenozoic-; clastic-rocks; Colombia-; compression-tectonics; Cosanga-Mendez-Fault; Cretaceous-; deformation-; deposition-; Ecuador-; evolution-; extension-tectonics; Farallon-Plate; faults-; fold-and-thrust-belts; fold-belts; folds-; foreland-basins; grabens-; intrusions-; Maranon-Basin; Maranon-Geanticline; Mesozoic-; Miocene-; molasse-; Nazca-Plate; Neogene-; Oriente-Basin; orogeny-; overturned-folds; Paleogene-; partitioning-; Peltetec-Fault; Peru-; plate-collision; plate-tectonics; plutons-; Putumayo-Basin; ramps-; salt-tectonics; sedimentary-rocks; South-America; strain-; strike-slip-faults; synclines-; systems-; tectonics-; terranes-; Tertiary-; thick-skinned-tectonics; thrust-faults; Upper-Cretaceous; upright-folds; variations-

CC - CATEGORY CODES: 16-Structural-geology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1996-072084

UD - UPDATE CODE: 199622

Registro 4652 de 5614 - GeoRef Disc 4: 1993-1996

TI - TITLE: Variations in structural style and kinematics of the Medina Block of Columbia.

AU - AUTHORS: Linares-Roberto; Rowan-Mark; Villamil-Tomas

AF - AUTHOR AFFILIATION: Ecopetrol, Bogota, Colombia

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1308. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: The Medina area is located in the Llanos foothills of the Eastern Cordillera, 100 km southwest of the giant Cusiana discovery. We illustrate a variety of fault/fold styles using both a regional, balanced cross section that traverses the entire Cordillera and a detailed, three dimensional interpretation of the Medina block derived from surface, seismic, and well data. The Eastern Cordillera represents a Triassic/Jurassic rift that evolved into a passive margin and that was subsequently inverted during Tertiary compression. Reactivation of the old basement rift blocks resulted in both thick and thin-skinned structures that are interpreted as part of the same tectonic event, rather than as separate phases. Paleozoic basement exposed in the hanging wall of the Tesalia Fault, west of the Medina block, represents the footwall of the west-dipping Mesozoic normal fault reactivated during shortening. The Tesalia Fault is a footwall shortcut that branched off from the normal fault at depth. In the hanging wall of the old normal fault, the structural style is dominated by detachment folds within Cretaceous, shale-rich strata; folding may have been caused by buttressing against the basement footwall to the East. The Medina block itself, located to the East in the footwall of the Tesalia Fault, is characterized by a different structural style. The Medina anticline is a large, fault-bend fold flanked on both sides by broad synclines. The western syncline forms the eastern flank of a duplex in the footwall of the Tesalia Fault. These thin-skinned geometries are attributed to the higher proportion of sandstone in this area, located between the old basement footwall and the craton to the East.

DE - DESCRIPTORS: Andes-; balanced-cross-sections; basement-tectonics; Colombia-; cross-sections; decollement-; Eastern-Cordillera; faults-; folds-; foot-wall; geometry-; geophysical-methods; geophysical-surveys; hanging-wall; interpretation-; Jurassic-; kinematics-; Llanos-; Medina-Block; Mesozoic-; normal-faults; reactivation-; seismic-methods; South-America; surveys-; synclines-; tectonics-; Tesalia-Fault; thick-skinned-tectonics; thin-skinned-tectonics; three-dimensional-models; Triassic-; variations-; wells-

CC - CATEGORY CODES: 16-Structural-geology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1996-072095

UD - UPDATE CODE: 199622

Registro 4653 de 5614 - GeoRef Disc 4: 1993-1996

TI - TITLE: Late Cretaceous in western Venezuela; a new biostratigraphical approach.

AU - AUTHORS: Lorente-Maria-A; Duran-Isbelia; Ruiz-Maibi

AF - AUTHOR AFFILIATION: MARAVEN, Caracas, Venezuela

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1309-1310. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: Two major cycles are considered on the late Cretaceous of the Maracaibo Basin: the (upper) La Luna-Tres Esquinas overlain by the Colon-Mito Juan cycle. The (upper) La Luna-Tres Esquinas is a major transgressive - regressive unit. The diachronous nature of La Luna-Tres Esquinas has been previously documented. But the westward younger age trend of its top is probably related with an erosive and/or non-depositional Campanian event, not previously reported from this Basin. For dating purposes of the uppermost La Luna-Tres Esquinas levels a selection of paleontological evidence can be geographically summarized as follows: to the East (Trujillo-Lara) ammonites species Peroniceras aff. canaense and Hauerlceras aff. gardeni dates the top as not younger than Coniacian to early Santonian. In central Lake Maracaibo Dicarinella asymetrica Zone dates Santonian to earliest Campanian. Further to the West (Perija) NK15-NK16 Zones dates as late Santonian. In the Western and Central Andes the Globotruncana ventricosa Zone dates the uppermost levels as Campanian. In some areas La Luna grades to the late Campanian (NK22-NK23 Zones) glauconitic-phosphatic Tres Esquinas Member. The absence of Globotruncanita calcarata and Globotruncanella havanensis Zones points to the possibility of an important hiatus involving part of late Campanian and up to earliest Maastrichtian not detected before in the basin. The section looks continuous to the west (Colombia) where late Campanian and earliest Maastrichtian has been dated with ammonites and dinoflagellates. In the Maracaibo Basin sedimentation started again during the Maastrichtian with progradation of Colon Formation. Subtle discontinuities within this unit were proven using the evolutionary trend of Ceratolithoides. These discontinuities may be related with the change from passive to active margin during the Maastrichtian. The cycle ends during the Danian with the clastics and carbonates from Mito Juan and Guasare formations.

DE - DESCRIPTORS: Ammonoidea-; biostratigraphy-; carbonate-rocks; Cephalopoda-; clastic-rocks; Colon-Formation; Cretaceous-; cycles-; Invertebrata-; La-Luna-Formation; Lake-Maracaibo; Maracaibo-Basin; Mesozoic-; Mito-Juan-Formation; Mollusca-; progradation-; regression-; sea-level-changes; sedimentary-rocks; sedimentation-; South-America; Tetrabranchiata-; transgression-; Tres-Esquinas-Member; unconformities-; Upper-Cretaceous; Venezuela-; western-Venezuela

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1996-072102

UD - UPDATE CODE: 199622

Registro 4654 de 5614 - GeoRef Disc 4: 1993-1996

TI - TITLE: Tectonothermal modeling of hydrocarbon maturation, central Maracaibo Basin, Venezuela.

AU - AUTHORS: Manske-M-Charles

AF - AUTHOR AFFILIATION: OMNI Laboratories, Maracaibo, Venezuela

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1310-1311. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: The petroliferous Maracaibo Basin of northwestern Venezuela and extreme eastern Colombia has evolved through a complex geologic history. Deciphering the tectonic and thermal evolution is essential in the prediction of hydrocarbon maturation (timing) within the basin. Individual wells in two area of the central basin, Blocks III and V, have been modeled to predict timing of hydrocarbon generation within the source Upper Cretaceous La Luna Formation, as well as within interbedded shales of the Lower-Middle Eocene Misoa Formation reservoir sandstones. Tectonic evolution, including burial and uplift (erosional) history, has been constrained with available well data. The initial extensional thermal regime of the basin has been approximated with a Mackenzie-type thermal model, and the following compressional stage of basin development by applying a foreland basin model. Corrected Bottom Hole Temperature (BHT) measurements from wells in the central basin, along with thermal conductivity measurements of rock samples from the entire sedimentary sequence, resulted in the estimation of present day heat flow. An understanding of the basin's heat flow, then, allowed extrapolation of geothermal gradients through time. The relation of geothermal gradients and overpressure within the Upper Cretaceous hydrocarbon-generating La Luna Formation and thick Colon Formation shales was also taken into account. Maturation modeling by both the conventional Time-Temperature Index (TTI) and kinetic Transformation Ratio (TR) methods predicts the timing of hydrocarbon maturation in the potential source units of these two wells. These modeling results are constrained by vitrinite reflectance and illite/smectite clay dehydration data, and show general agreement. These results also have importance regarding the timing of structural formation and hydrocarbon migration into Misoa reservoirs. A final prediction of the modeling results is that the porosity and permeability of Misoa reservoir sandstones may have been diagenetically enhanced by organic acids expulsed from adjacent shales just prior to hydrocarbon maturation.

DE - DESCRIPTORS: basins-; Block-III; Cenozoic-; clastic-rocks; clay-minerals; Colon-Formation; Cretaceous-; Eocene-; evolution-; extension-tectonics; foreland-basins; genesis-; geothermal-gradient; heat-flow; illite-; kinetics-; La-Luna-Formation; lower-Eocene; macerals-; Maracaibo-Basin; maturity-; Mesozoic-; migration-; Misoa-Formation; models-; overpressure-; Paleogene-; permeability-; petroleum-; pressure-; reflectance-; reservoir-rocks; sandstone-; sedimentary-rocks; shale-; sheet-silicates; silicates-; smectite-; source-rocks; South-America; tectonics-; temperature-; Tertiary-; thermal-conductivity; thermal-history; uplifts-; Upper-Cretaceous; Venezuela-; vitrinite-; wells-

CC - CATEGORY CODES: 29A-Economic-geology,-geology-of-energy-sources; 16-Structural-geology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States

IS - ISSN: 0149-1423

CO - CODEN: AABUD2

AN - ACCESSION NUMBER: 1996-072106

UD - UPDATE CODE: 199622

Registro 4655 de 5614 - GeoRef Disc 4: 1993-1996

TI - TITLE: Successful drilling of the first horizontal well in a mature field.

AU - AUTHORS: Marruffo-Ilsis; Achong-Claudio

AF - AUTHOR AFFILIATION: CORPOVEN, Puerto la Cruz, Venezuela

BK - BOOK TITLE: In: AAPG international conference and exhibition; abstracts.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: AAPG Bulletin. 80; 8, Pages 1312-1313. 1996.

PB - PUBLISHER: American Association of Petroleum Geologists. Tulsa, OK, United States. 1996.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1996

CN - CONFERENCE INFORMATION: AAPG international conference and exhibition. Caracas, Venezuela. Sept. 8-11, 1996.

LA - LANGUAGE: English

AB - ABSTRACT: This paper discusses how the decision to drill the first horizontal well of a reservoir was taken, based on production acceleration and the incremental economy of cash flow. The reservoir is located in the Guafita-Norto Field in Western Venezuela, contiguous to the La Yuca-Cano Limon Fields in Colombia. Guafita-Norte has 183 million stb of remaining oil reserves with 26 production wells on electrical submergible pumps. The STOIP of this under saturated reservoir (bubble point pressure is 36 psi) is 160 million stb with an initial GOR of 10 stf/stb, having a permeability between 1.5-12 darcies with a strong water drive, water coning and sanding problems due to fines migration. During 1995, it was decided to drill the first horizontal well in the reservoir based on a 3-D numerical simulation with radial flow (for water coning) and local grid refinement (for horizontal wells) coupled to an economic analysis. The simulation predetermines an initial production rate for a horizontal well 2.5 times greater than for a vertical one, and the incremental cash flow for the horizontal well is 4.5 MM$ larger for the the vertical one in four (4) years, with a ROR of 200%. The horizontal well was drilled with oil-based mud to avoid hole collapse, and it was completed open hole with a single screen pack. The well is currently producing between 2000 and 3500 stb/d, clean, on natural flow. This study has clearly shown that the ultimate and decisive parameter to be weighed before undertaking this type of project, is the economic analysis, which must be performed as extensively as the technical analysis.

DE - DESCRIPTORS: Cano-Limon-Field; Colombia-; drilling-; economics-; Guafita-Norto-Field; horizontal-drilling; La-Yuca-Field; numerical-analysis; oil-and-gas-fields; permeability-; petroleum-; production-; reserves-; reservoir-rocks; simulation-; South-America; three-dimensional-models; Venezuela-; wells-; western-Venezuela

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 2000, American Geological Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States