A New Exploration Play in the southwestern Region of the Golfo San Jorge Basin

摘要

Guillermo Cardinali;Marcelo Borderas;Monica Lucero;Eduardo Figari;rn;;;;rnrnAbstractrnThe Golfo San Jorge basin, located in the central Patagonia, isrnthe oldest producing basin of Argentina. It is an intracratonicrnextensionla basin, where the first economic discovery tookrnplace in 1907.rnIn the sothwestern sector, the Cerro Piedra – Cerro GuadalrnNorte area has a surface of 1835 sq Km, and only one field inrnproduction, the Cerro piedra field that has a daily productionrnof 330 cubic meters of oil and 44500 cubic meters of gas fromrn40 wells. The reservoir unit is the bajo Barreal formation, thatrnbelongs to the Chubut Group (K) and is part of the best knownrnplay of the basin. Though 2D seismic analysis and the use ofrnspecial techniques, an AVO study was made that showed anrninteresting response in the P normal wave incidence and thernfluid factor.rnThis way it was possible to discriminate the top and basernof an important gas bearing zone in the seismic, with a goodrncorrelation in the field with the well logs .From this a newrnPlay is recognized, the Patagonia Formation of Tertiary Age.rnIt consist of sandstone deposit, oroginated in a marinernenvironment, up to 35 m thick, that by wells, with arnproduction of 165000 m3/day.rnThis discovery is a new case in the basin and makes up anrninteresting exploration play in this part of the basin.