First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela
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Redalyc · Ciencias Marinas
The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At th...
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| Publicado en: | Ciencias Marinas |
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Autónoma de Baja California
2011
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| _version_ | 1878325299791265792 |
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| author | E García |
| author_facet | E García |
| collection | Ciencias Marinas |
| container_title | Ciencias Marinas |
| contents | First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela E García A Cróquer C Bastidas D Bone R Ramos Ciencias de la Tierra soft drilling muds Drilling fluids gas exploration sediment chemistry The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At the Ballena well, samples were collected 15 days, 13 months, 19 months, and 30 months after the perforation at 190 m depth. At the Cocuina well, sampling occurred immediately before, and 15 days and 12 months after the perforation at 350 m depth. Principal component analysis and multidimensional scaling were used to assess spatial and temporal patterns of environmental and biotic variables. The temporal pattern was clear, as differences between samples decreased with time after perforation. The results suggest that drilling muds initially changed the chemistry of sediments, but that these changes apparently disappeared approximately two years after perforation and were homogenous at a spatial scale of up to 1 km from the perforation site. A larger spatial scale and more frequent monitoring would be necessary to further understand the potential mechanisms underlying the dispersion and transportation of drilling fluids and muds. This study provides baseline data and the first description of the relevant spatial and temporal scales for monitoring the potential effects of chemicals associated with the exploration of offshore gas in Venezuela. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48020772003 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.37 |
| ctrlnum | oai:cienciasmarinas.com.mx:article/1763 10.7773/cm.v37i2.1763 |
| description | The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At the Ballena well, samples were collected 15 days, 13 months, 19 months, and 30 months after the perforation at 190 m depth. At the Cocuina well, sampling occurred immediately before, and 15 days and 12 months after the perforation at 350 m depth. Principal component analysis and multidimensional scaling were used to assess spatial and temporal patterns of environmental and biotic variables. The temporal pattern was clear, as differences between samples decreased with time after perforation. The results suggest that drilling muds initially changed the chemistry of sediments, but that these changes apparently disappeared approximately two years after perforation and were homogenous at a spatial scale of up to 1 km from the perforation site. A larger spatial scale and more frequent monitoring would be necessary to further understand the potential mechanisms underlying the dispersion and transportation of drilling fluids and muds. This study provides baseline data and the first desciption of the relevant spatial and temporal scales for monitoring the potential effects of chemicals associated with the exploration of offshore gas in Venezuela.
La macrofauna bentónica de dos pozos de gas costa afuera se evaluó por primera vez en Venezuela y se correlacionó con cambios en la química del sedimento después de las perforaciones exploratorias. Para ello, se realizó un análisis de gradiente a cuatro intervalos de distancia desde el sitio de perforación hasta 1000 m del mismo. En el pozo Ballena, las muestras se recolectaron a los 15 días, 13 meses, 19 meses y 30 meses después de la perforación a 190 m de profundidad. En el pozo Cocuina, el muestreo se realizó justo antes y 15 días y 12 meses después del la perforación a 350 m de profundidad. Los patrones espaciales y temporales de las variables ambientales y bióticas se evaluaron a través del análisis de componentes principales y de escalado multidimensional. Se obtuvo un patrón temporal claro dado que las diferencias entre muestras disminuyeron con el tiempo después de la perforación. Los resultados sugieren que los ripios de perforación cambiaron inicialmente la química de los sedimentos, pero estos cambios tendieron a desaparecer aproximadamente dos años después de la perforación y fueron homogéneos a 1 km alrededor del sitio de perforación. Para un mejor entendimiento de los mecanismos de dispersión y transporte de los fluidos de perforación y ripios serían necesarios una mayor escala espacial y monitoreos más frecuentes. Este estudio provee datos de línea base y constituye una primera descripción de las escalas temporales y espaciales relevantes para evaluar los efectos potenciales de desechos químicos asociados a la industria de exploración de gas costa afuera en Venezuela. |
| format | Artículo científico |
| id | redalyc_48020772003 |
| institution | Redalyc Ciencias Marinas |
| language | en |
| publishDate | 2011 |
| publisher | Universidad Autónoma de Baja California |
| spelling | First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela Primer estudio ambiental de descargas asociadas a perforaciones de gas costa afuera- Plataforma Deltana, Venezuela García, E Cróquer, A Bastidas, C Bone, D Ramos, R drilling fluids drilling muds gas exploration sediment chemistry soft-bottom communities fluidos de perforación ripios exploración de gas química del sedimento comunidades de fondos blandos The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At the Ballena well, samples were collected 15 days, 13 months, 19 months, and 30 months after the perforation at 190 m depth. At the Cocuina well, sampling occurred immediately before, and 15 days and 12 months after the perforation at 350 m depth. Principal component analysis and multidimensional scaling were used to assess spatial and temporal patterns of environmental and biotic variables. The temporal pattern was clear, as differences between samples decreased with time after perforation. The results suggest that drilling muds initially changed the chemistry of sediments, but that these changes apparently disappeared approximately two years after perforation and were homogenous at a spatial scale of up to 1 km from the perforation site. A larger spatial scale and more frequent monitoring would be necessary to further understand the potential mechanisms underlying the dispersion and transportation of drilling fluids and muds. This study provides baseline data and the first desciption of the relevant spatial and temporal scales for monitoring the potential effects of chemicals associated with the exploration of offshore gas in Venezuela. La macrofauna bentónica de dos pozos de gas costa afuera se evaluó por primera vez en Venezuela y se correlacionó con cambios en la química del sedimento después de las perforaciones exploratorias. Para ello, se realizó un análisis de gradiente a cuatro intervalos de distancia desde el sitio de perforación hasta 1000 m del mismo. En el pozo Ballena, las muestras se recolectaron a los 15 días, 13 meses, 19 meses y 30 meses después de la perforación a 190 m de profundidad. En el pozo Cocuina, el muestreo se realizó justo antes y 15 días y 12 meses después del la perforación a 350 m de profundidad. Los patrones espaciales y temporales de las variables ambientales y bióticas se evaluaron a través del análisis de componentes principales y de escalado multidimensional. Se obtuvo un patrón temporal claro dado que las diferencias entre muestras disminuyeron con el tiempo después de la perforación. Los resultados sugieren que los ripios de perforación cambiaron inicialmente la química de los sedimentos, pero estos cambios tendieron a desaparecer aproximadamente dos años después de la perforación y fueron homogéneos a 1 km alrededor del sitio de perforación. Para un mejor entendimiento de los mecanismos de dispersión y transporte de los fluidos de perforación y ripios serían necesarios una mayor escala espacial y monitoreos más frecuentes. Este estudio provee datos de línea base y constituye una primera descripción de las escalas temporales y espaciales relevantes para evaluar los efectos potenciales de desechos químicos asociados a la industria de exploración de gas costa afuera en Venezuela. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas 2011-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/1763 10.7773/cm.v37i2.1763 Ciencias Marinas; Vol. 37 No. 2 (2011); 141-155 Ciencias Marinas; Vol. 37 Núm. 2 (2011); 141-155 2395-9053 0185-3880 eng https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/1763/1720 ['Redalyc'] redalyc_48020772003 First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela ['First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela', 'E García', 'Ciencias de la Tierra', 'soft', 'drilling muds', 'Drilling fluids', 'gas exploration', 'sediment chemistry', 'First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela E García A Cróquer C Bastidas D Bone R Ramos Ciencias de la Tierra soft drilling muds Drilling fluids gas exploration sediment chemistry The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At the Ballena well, samples were collected 15 days, 13 months, 19 months, and 30 months after the perforation at 190 m depth. At the Cocuina well, sampling occurred immediately before, and 15 days and 12 months after the perforation at 350 m depth. Principal component analysis and multidimensional scaling were used to assess spatial and temporal patterns of environmental and biotic variables. The temporal pattern was clear, as differences between samples decreased with time after perforation. The results suggest that drilling muds initially changed the chemistry of sediments, but that these changes apparently disappeared approximately two years after perforation and were homogenous at a spatial scale of up to 1 km from the perforation site. A larger spatial scale and more frequent monitoring would be necessary to further understand the potential mechanisms underlying the dispersion and transportation of drilling fluids and muds. This study provides baseline data and the first description of the relevant spatial and temporal scales for monitoring the potential effects of chemicals associated with the exploration of offshore gas in Venezuela. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48020772003 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.37'] ['E García'] ['E García'] ['Artículo científico'] ['2011'] ['Universidad Autónoma de Baja California'] ['en'] ['Ciencias de la Tierra', 'soft', 'drilling muds', 'Drilling fluids', 'gas exploration', 'sediment chemistry'] ['https://www.redalyc.org/articulo.oa?id=48020772003'] ['First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela E García A Cróquer C Bastidas D Bone R Ramos Ciencias de la Tierra soft drilling muds Drilling fluids gas exploration sediment chemistry The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At the Ballena well, samples were collected 15 days, 13 months, 19 months, and 30 months after the perforation at 190 m depth. At the Cocuina well, sampling occurred immediately before, and 15 days and 12 months after the perforation at 350 m depth. Principal component analysis and multidimensional scaling were used to assess spatial and temporal patterns of environmental and biotic variables. The temporal pattern was clear, as differences between samples decreased with time after perforation. The results suggest that drilling muds initially changed the chemistry of sediments, but that these changes apparently disappeared approximately two years after perforation and were homogenous at a spatial scale of up to 1 km from the perforation site. A larger spatial scale and more frequent monitoring would be necessary to further understand the potential mechanisms underlying the dispersion and transportation of drilling fluids and muds. This study provides baseline data and the first description of the relevant spatial and temporal scales for monitoring the potential effects of chemicals associated with the exploration of offshore gas in Venezuela. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48020772003 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.37'] |
| spellingShingle | First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela E García Ciencias de la Tierra soft drilling muds Drilling fluids gas exploration sediment chemistry First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela E García A Cróquer C Bastidas D Bone R Ramos Ciencias de la Tierra soft drilling muds Drilling fluids gas exploration sediment chemistry The benthic macrofauna of two Deltana Platform offshore gas wells was assessed for the first time in Venezuela and correlated with changes in sediment chemistry after exploratory perforation. A gradient analysis was performed at four distance intervals from the perforation site to 1000 m away. At the Ballena well, samples were collected 15 days, 13 months, 19 months, and 30 months after the perforation at 190 m depth. At the Cocuina well, sampling occurred immediately before, and 15 days and 12 months after the perforation at 350 m depth. Principal component analysis and multidimensional scaling were used to assess spatial and temporal patterns of environmental and biotic variables. The temporal pattern was clear, as differences between samples decreased with time after perforation. The results suggest that drilling muds initially changed the chemistry of sediments, but that these changes apparently disappeared approximately two years after perforation and were homogenous at a spatial scale of up to 1 km from the perforation site. A larger spatial scale and more frequent monitoring would be necessary to further understand the potential mechanisms underlying the dispersion and transportation of drilling fluids and muds. This study provides baseline data and the first description of the relevant spatial and temporal scales for monitoring the potential effects of chemicals associated with the exploration of offshore gas in Venezuela. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48020772003 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.2 Vol.37 |
| title | First environmental monitoring of offshore gas drilling discharges in the Deltana Platform, Venezuela |
| title_alt | Primer estudio ambiental de descargas asociadas a perforaciones de gas costa afuera- Plataforma Deltana, Venezuela |
| topic | Ciencias de la Tierra soft drilling muds Drilling fluids gas exploration sediment chemistry |
| topic_facet | drilling fluids drilling muds gas exploration sediment chemistry soft-bottom communities fluidos de perforación ripios exploración de gas química del sedimento comunidades de fondos blandos |
| url | https://www.redalyc.org/articulo.oa?id=48020772003 https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/1763 |