Petrotectónica y Bioestratigrafía de las areniscas del Grupo Azúcar al suroeste del Ecuador.
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2011
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El Grupo Azúcar del Paleoceno Tardío en el suroeste del Ecuador han producido petróleo por 100 años, pero aún son objetivos atractivos para exploración y desarrollo. El Grupo Azúcar tiene al menos 2750 metros de espesor y consiste de areniscas, conglomerados y lutitas. Las areniscas Azúcar sobreyacen discordantemente a las lutitas silicificadas de la formación Santa Elena (Cretácico-Paleoceno Temprano); se distribuyen al sur de la falla Chongón-Colonche. El objetivo del estudio es determinar la bioestratigrafía, composición y condiciones tectónicas de depositación de la arenisca Azúcar en el suroeste del Ecuador. Para este propósito se reconocieron 4 afloramientos en Playas-cerro Zapotal y se examinaron 33 muestras petrográficas y 23 micropaleontológicas; además, se analizaron datos petrográficos procedentes de 9 pozos de los campos petroleros Ancón y Santa Paula; y finalmente se utilizaron diagramas de procedencia tectónica (Dickinson, 1979 y 1986). El Grupo Azúcar en Playas-cerro Zapotal consiste de monótonas repeticiones de areniscas, conglomerados y menores lutitas, que representan secuencias truncadas de Bouma (Ta, Tb, Te; Ta Tb, Td; Ta, Tb; y Ta). En el afloramiento Playas se identificaron foraminíferos bentónicos aglutinados de edad Paleoceno y de paleoambiente marino profundo mayor a 3000 metros. El conocimiento de la composición de la arenisca Azúcar y sus condiciones tectónicas de depositación permitirán optimizar su exploración y explotación petrolera en la costa sur ecuatoriana.
The Late Paleocene Sugar Group in southwestern Ecuador oil have been produced for 100 years, but are still attractive targets for exploration and development. The Sugar Group has at least 2750 meters thick and consists of sandstones, conglomerates and shales. Sugar sandstones unconformably overlying silicified shales Santa Elena formation (Early Cretaceous-Paleocene) are distributed south of the fault-Colonche Chongón. The aim of the study is to determine the biostratigraphy, composition and tectonic conditions of deposition of the sandstone Sugar in southwestern Ecuador. For this purpose, recognized four-hill outcrops Zapotal Beaches and examined 33 samples petrographic and micropaleontological 23; also petrographic data were analyzed from 9 wells in the oil fields Ancon and Santa Paula, and finally used diagrams of tectonic origin (Dickinson, 1979 and 1986). The Beaches Group-hill Sugar Zapotal consists of monotonous repetitions of sandstones, shales and minor conglomerates that represent truncated Bouma sequences (Ta, Tb, Te, Ta Tb, Td, Ta, Tb, and Ta). Beaches In outcrop identified agglutinated benthic foraminifera and paleoenvironment Paleocene deep marine greater than 3000 meters. The knowledge of the composition of the sandstone Sugar and depositional tectonic conditions to optimize oil exploration on the southern coast of Ecuador.
The Late Paleocene Sugar Group in southwestern Ecuador oil have been produced for 100 years, but are still attractive targets for exploration and development. The Sugar Group has at least 2750 meters thick and consists of sandstones, conglomerates and shales. Sugar sandstones unconformably overlying silicified shales Santa Elena formation (Early Cretaceous-Paleocene) are distributed south of the fault-Colonche Chongón. The aim of the study is to determine the biostratigraphy, composition and tectonic conditions of deposition of the sandstone Sugar in southwestern Ecuador. For this purpose, recognized four-hill outcrops Zapotal Beaches and examined 33 samples petrographic and micropaleontological 23; also petrographic data were analyzed from 9 wells in the oil fields Ancon and Santa Paula, and finally used diagrams of tectonic origin (Dickinson, 1979 and 1986). The Beaches Group-hill Sugar Zapotal consists of monotonous repetitions of sandstones, shales and minor conglomerates that represent truncated Bouma sequences (Ta, Tb, Te, Ta Tb, Td, Ta, Tb, and Ta). Beaches In outcrop identified agglutinated benthic foraminifera and paleoenvironment Paleocene deep marine greater than 3000 meters. The knowledge of the composition of the sandstone Sugar and depositional tectonic conditions to optimize oil exploration on the southern coast of Ecuador.
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BIOESTRATIGRAFIA, DEPÓSITOS MINERALES, GEOTECTÓNICA, GRUPO AZÚCAR, MICROPALEONTOLOGÍA, PETROGRAFÍA