Hydrogeology of a Large Oil-and-Gas Basin in Central by Mario Alberto Hernández, Nilda González, Lisandro Hernández

By Mario Alberto Hernández, Nilda González, Lisandro Hernández

This ebook analyzes an important geohydrological elements of the San Jorge Gulf Basin (Chubut and Santa Cruz provinces, Argentine Patagonia), with a specific specialise in the actual and hydrodynamic features of the approach. came across in 1907, the San Jorge Gulf Basin used to be the 1st petroleum and gas-producing basin in Argentina. it's also some of the most vital parts with actual customers for non-conventional exploitation (shale oil-gas). After characterizing the hydroclimatic historical past (hydrometeorological parameters and water balance), the booklet describes the most actual points: geomorphology, soils and floor in addition to subsoil geology, specially lithology, constructions, stratigraphy and hydrogeology.

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Extra info for Hydrogeology of a Large Oil-and-Gas Basin in Central Patagonia: San Jorge Gulf Basin, Argentina

Example text

It does not include the central area either, as— together with such a disappearance—there are usually no oil reservoirs, and if there are, they lack wells that would provide suitable information. A general direction of the regional flow towards the east (Atlantic Ocean) may be observed, with divergent sectors such as the one located to the southeast of the Cerro Dragón, where the runoff can be locally recognized from a SW–NE-trending groundwater divide towards the large depression where the Musters and Colhué Huapi lakes occur.

Besides, from the legal point of view, the legislation of the Province of Santa Cruz does not differentiate between them (Hernández and Hernández 2013), as shall be analyzed below. At the top of the hydrogeological sequence are the Pleistocene “Rodados Patagónicos” that are part of the vadose zone or host the phreatic aquifer; in the former case, when they are at a shallow depth. The vadose zone may sometimes reach an important development of over 20 m in the tableland areas (Hernández et al. 2009a), while being shallow along the marine coastline.

2 Physical Component of the Local Geohydrological System 47 Fig. 1 Different patterns of hydrolithological behaviour in the Patagonia Formation, based on representative well logs 48 4 Geohydrology In the case of this aquifer, it is significant due to its marked anisotropy (horizontal and vertical) and at times its strong heterogeneity, as shown by the hydrolithological patterns of behaviour described above. This characteristic affects the regularity in the behaviour of the groundwater dynamics, but even more markedly the hydrochemical quality, with major areal changes that have made it difficult, for instance, to apply the ion contents to the entire region, as discussed in the corresponding section.

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