ResumenSe presenta el estudio sobre patrones de asentamiento y arquitectura doméstica para la costa desértica de Tarapacá (norte de Chile). Se analizan los registros constructivos de ocho sitios ubicados entre Pisagua y la desembocadura del río Loa (ca. 19º 55' -21º 43' S.), así como nuevos contextos datados en Punta Patache, que amplían el conocimiento sobre las ocupaciones formativas en la zona. Se discute la variabilidad de los patrones arquitectónicos identificados para finalmente plantear el desarrollo de una Tradición Arquitectónica Costera para el período Formativo (900 AC -900 DC), que expresa las innovaciones y transformaciones percibidas por las sociedades costeras de Tarapacá.Palabras claves: asentamientos -arquitectura -tradición arquitectónica costera -período Formativo -Tarapacá. AbstractWe present a study of settlement patterns and domestic architecture for the Tarapacá Coast (ca. 19º 55' -21º 43' S.). We expose new formative evidence and radiocarbon dates from Patache Peninsula sites and full construction database analysis from eight sites located between Pisagua and the Loa river. We discuss the variability of domestic buildings to argue a durable Coastal Architectonic Tradition during the Formative Period (900 BD -900 AD), that points out long term changes and household innovation process inside coastal societies of Tarapacá.

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fax 01-972-952-9435. AbstractThe main objective of this study was to describe the nature, distribution, and physical characteristics of the reservoir, by integrating geophysical, geological, petrophysical, and production data in a three dimensional geological and simulation model that represents the behavior of the Hollin reservoir in Bermejo field. The Hollin reservoir required significantly higher effort due to the strong aquifer, the complex relationship between heterogeneity influences, the movement of the water from the aquifer into the reservoir, water and gas conning, stagnation of unproduced oil zones, and migration of oil towards gas zones.When production data was analyzed, it was determined that even thin shales (on the order of 2-5 ft. or greater) played a role in enhancing reservoir production by delaying water and gas conning and water influx in the Hollin fluvial sandstone. Mapping the shale barriers was as important as mapping the sand bodies. It was decided to correlate the shales interpreted from well log data and introduce shale tops and bases in the geological model. Therefore, in the geological and simulation models shales have been modeled explicitly, down to a five foot resolution. A Stratigraphic geocellular model was constructed to describe the 3D petrophysical properties, calculate hydrocarbons in place and to prepare reservoir simulation grids. Geological models incorporating shales were modeled. If shale was locally absent, the "shale zone" was assigned the appropriate reservoir properties determined from well and/or seismically derived attributes. J-Function analysis was implemented successfully in assigning oil saturation. Calculated oil saturation profiles at initial and current times were compared with initial well log oil saturations.History matching and initialization were conducted to validate geological, petrophysical, PVT, and reservoir models. Flooded and non-flooded regions of reservoir, current WOC and GOC were identified. Areal extent of localized thin shale lenses were modified during history, matching active water breakthrough well by well. The amount of oil invasion in the original gas zone, stagnated oil, and gas contraction volumes were calculated in the most productive marker, Naranja. Current GOC has moved from the original GOC position. Actually, the amount of oil invasion was not significant when it was compared to the volume of stagnated oil.When geological and simulation models are built and data gathered according reservoir specific problems, successful history matching and predictions can be obtained.