By Mario Alberto Hernández, Nilda González, Lisandro Hernández
This booklet analyzes an important geohydrological facets of the San Jorge Gulf Basin (Chubut and Santa Cruz provinces, Argentine Patagonia), with a selected specialize in the actual and hydrodynamic features of the procedure. came upon in 1907, the San Jorge Gulf Basin was once the 1st petroleum and gas-producing basin in Argentina. it's also some of the most very important parts with genuine customers for non-conventional exploitation (shale oil-gas). After characterizing the hydroclimatic history (hydrometeorological parameters and water balance), the publication describes the most actual features: geomorphology, soils and floor in addition to subsoil geology, particularly lithology, buildings, stratigraphy and hydrogeology.
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Additional resources for Hydrogeology of a Large Oil-and-Gas Basin in Central Patagonia: San Jorge Gulf Basin, Argentina
On the other hand, in other sectors, sandy sedimentary rocks predominate and the ﬁner fractions are subordinate, normally as intercalations. The Santa Cruz Formation is part of a sedimentary complex together with the upper section of the Patagonia Formation, with a succession of ﬁne- to medium-grained sandstones, tuffaceous claystones, claystones, tuffs and tufﬁtes, generally assigned to the Miocene (Nullo and Combina 2002). Normally, it is very difﬁcult to differentiate both formations in well logs, except on the basis of their microfossil content (Hernández and Hernández 2013).
1990). Even though their origin is lacustrine, marine deposits have been assigned to this unit in the west of the basin. The Pozo Cerro Guadal Formation overlies the above-mentioned unit with angular discordance: it is composed of quartz sandstones, hard and compact, with a tuffaceous matrix, tuffaceous siltstones, clear tuffs, and black pelites (Lesta and Ferello 1972). Its thickness in the type location, where it has been completely drilled through, is 560 m, with an average of 300 m. Although its origin is lacustrine like the above-mentioned formation, it has a signiﬁcantly lower organic content (Sylwan et al.
The SGS is the most important system for the objectives of this work due to its relationship with the present-day hydrological cycle, as mentioned above. 46 4 Geohydrology Beginning with the Salamanca Formation, has a poor aquifer capacity at its base, composed of glauconite sandstones where a water-oil-gas system occurs and in which the original ﬁnding of HCs took place. As shall be explained below, the conﬁned aquifer bears saline water, except in one unit in the Western Sector (undocumented) in which fresh to brackish water was found.