Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
ECOPETROL S.A.
2006
|
| Soggetti: | |
| Accesso online: | https://www.redalyc.org/articulo.oa?id=46530201 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866814285139673088 |
|---|---|
| author | Carlos Cuartas |
| author_facet | Carlos Cuartas |
| contents | Quantitative biostratigraphic model for the tertiary of the lower Magdalena Basin, Colombian Caribbean Carlos Cuartas José-Ignacio Martínez Carlos Jaramillo Ingeniería tertiary graphic correlation geology calibration planktonic foraminifera quantitative biostratigraphy The reinterpretation of biostratigraphic information by new models and quantitative correlation techniquessubstantially improves its resolution and its correlative potential, thus minimizing oil exploration risks. Withthis aim, biostratigraphic information, i.e. first (FO) and last (LO) occurrence events of benthonic andplanktonic foraminifera was analysed from sixteen wells from the Lower Magdalena Valley (LMV).The inconsistencies found in the biostratigraphic record, i.e. varying successions of first and last appearances ofspecies from well to well as a result of several factors such incomplete sampling and preservation, true variationin the distribution of fosil taxa, etc., and the great amount of biostratigraphic data makes it practically impossibleto accurately constrain basin history from biostratigraphic information by unaided visual inspection. Thismotivates the treatment of biostratigraphic information with new quantitative approaches, such as constrainedoptimization (CONOP9 software) and graphic correlation concepts (GraphCor 3,0) and the comparativemethod approach of Cooper et al. (2001).The succession of biostratigraphic events found through the application of each technique was statistically filteredand compared with Kendall tau coefficients whose values were 0,8. An optimal biostratigraphic succession ofLOs was found and calibrated with the Berggren et al. (1995) global time scale by a LOESS regression model forthe middle Eocene-Pliocene interval, thus revealing three major changes in sediment accumulation rates for thebasin during this time interval: (1) middle Eocene to Oligocene, with low accumulation rates, (2) early Miocene tomiddle Miocene, with high accumulation rates and (3) late Miocene to Pliocene, with lower accumulation rates.The calibrated composite succession enabled the construction of age-well depth plots, which indicate periodsof local deposition and accumulation rates, and periods of erosion, no deposition or very low accumulationrates (unconformities). The best plots were used to build a model for the correlation of unconformities, whichshows that they are heterochronous, lasted at least 2,5 Ma, and are of limited extent.Finally, a correlation model was proposed that includes: (1) a time-calibrated succession of biostratigraphicevents, and (2) a Haq curve that shows how each geologic period is recorded in each well 2006 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530201 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.2 Vol.3 |
| format | Artículo científico |
| id | redalyc_46530201 |
| language | en |
| publishDate | 2006 |
| publisher | ECOPETROL S.A. |
| spellingShingle | Quantitative biostratigraphic model for the tertiary of the lower Magdalena Basin, Colombian Caribbean Carlos Cuartas Ingeniería tertiary graphic correlation geology calibration planktonic foraminifera quantitative biostratigraphy Quantitative biostratigraphic model for the tertiary of the lower Magdalena Basin, Colombian Caribbean Carlos Cuartas José-Ignacio Martínez Carlos Jaramillo Ingeniería tertiary graphic correlation geology calibration planktonic foraminifera quantitative biostratigraphy The reinterpretation of biostratigraphic information by new models and quantitative correlation techniquessubstantially improves its resolution and its correlative potential, thus minimizing oil exploration risks. Withthis aim, biostratigraphic information, i.e. first (FO) and last (LO) occurrence events of benthonic andplanktonic foraminifera was analysed from sixteen wells from the Lower Magdalena Valley (LMV).The inconsistencies found in the biostratigraphic record, i.e. varying successions of first and last appearances ofspecies from well to well as a result of several factors such incomplete sampling and preservation, true variationin the distribution of fosil taxa, etc., and the great amount of biostratigraphic data makes it practically impossibleto accurately constrain basin history from biostratigraphic information by unaided visual inspection. Thismotivates the treatment of biostratigraphic information with new quantitative approaches, such as constrainedoptimization (CONOP9 software) and graphic correlation concepts (GraphCor 3,0) and the comparativemethod approach of Cooper et al. (2001).The succession of biostratigraphic events found through the application of each technique was statistically filteredand compared with Kendall tau coefficients whose values were 0,8. An optimal biostratigraphic succession ofLOs was found and calibrated with the Berggren et al. (1995) global time scale by a LOESS regression model forthe middle Eocene-Pliocene interval, thus revealing three major changes in sediment accumulation rates for thebasin during this time interval: (1) middle Eocene to Oligocene, with low accumulation rates, (2) early Miocene tomiddle Miocene, with high accumulation rates and (3) late Miocene to Pliocene, with lower accumulation rates.The calibrated composite succession enabled the construction of age-well depth plots, which indicate periodsof local deposition and accumulation rates, and periods of erosion, no deposition or very low accumulationrates (unconformities). The best plots were used to build a model for the correlation of unconformities, whichshows that they are heterochronous, lasted at least 2,5 Ma, and are of limited extent.Finally, a correlation model was proposed that includes: (1) a time-calibrated succession of biostratigraphicevents, and (2) a Haq curve that shows how each geologic period is recorded in each well 2006 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530201 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.2 Vol.3 |
| title | Quantitative biostratigraphic model for the tertiary of the lower Magdalena Basin, Colombian Caribbean |
| topic | Ingeniería tertiary graphic correlation geology calibration planktonic foraminifera quantitative biostratigraphy |
| url | https://www.redalyc.org/articulo.oa?id=46530201 |