IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
EVOLUCIÓN DIAGENÉTICA DE LA FORMACIÓN TUNAS PARA EL POZO PANG0001, CUENCA DE CLAROMECÓ, PROVINCIA DE BUENOS AIRES, ARGENTINA: SU POTENCIAL COMO RESERVORIO DE HIDROCARBUROS
Autor/es:
FORTUNATTI, NATALIA; TOMEZZOLI, RENATA NELA; CESARETTI N. NORA; FEBBO, M. BELÉN; ARZADÚN, GUADALUPE
Lugar:
Mendoza
Reunión:
Congreso; 10º Congreso de Exploración y Desarrollo de Hidrocarburos; 2018
Institución organizadora:
IAPG
Resumen:
Diagenetic evolution of Tunas Formation in PANG 0001well, Claromecó Basin, Buenos Aires province,Argentina: its potential as a hydrocarbon reservoir. Claromecó Basin (Carboniferous-Permian) is considered a frontier basin due to its limitedgeologic knowledge. This basin has economic potential based on coal beds and seams and associated methane gas, recorded underground. The aim of this work is to evaluate the economic potential of Tunas Formation in the PANG 0001 well, based on petrographic, diagenetic and fluid inclusion studies in sandy facies. In addition, oleogenetic potential of muddy faces through TOC (total organic carbon) analysis is determined. PANG 0001 well is located in the basin center. In this well Tunas Formation is made of medium to fine sized sandstones, tuffs, mudrocks, carbonaceous mudrocks and coal levels. Identified diagenetic processes include mechanical compaction, cement precipitation, alteration, replacement, dissolution and late tectonic fracturing. Physical compaction is the predominant factor, along with precipitation of diagenetic minerals reduce porosity and decrease reservoir quality. Secondary porosity is comprised by rock and grain fracture and feldspar and carbonate cement dissolution; its value reaches 0.2 to 0.6%. Fluid inclusions are aqueous, placed mainly in cements, and also organic, with yellow and light blue fluorescence, located in microfractures and veins; those colors indicate presence of liquid to wet gas hydrocarbons and dry gas (methane) respectively. During early diagenesis precipitation of carbonate cements and mechanical compaction of sandy facies were dominant. Poral space was reduced by these diagenetic processes. Mesogenesis conditions are proper to generate hydrocarbons and an acid environment to dissolve feldspars andcarbonate cement. Subsequent compaction, tectonic events and fluid pressure generate secondary porosity, increase the reservoir quality and allow hydrocarbon migration. Finally, quartz and feldspars overgrowth, late calcite cement precipitation and fractures healing occur during late mesogenesis and reduce porosity. Total organic carbon values are 0.5-5% in mudrocks and 12-26% for carbonaceous mudrocks. Based on previous results, it can be concluded that Tunas Formation has potential as source rock in muddy levels and as reservoir in sandy levels, so the formation can be considered as a potential speculative petroleum system: Tunas-Tunas (?).