02981nmc a2200301 4500 20260520010404.0 260224s2018 xxu esp Español 068.82 553.28 C62 2018 0015658 El reservorio tight de la Fm. Lajas y su relación con la roca madre, Estación Fernández Oro, Cuenca Neuquina, Argentina 2018 02/09/2025 ; 08/04/2019 9 p. ; 291-300 Estación Fernández Oro block is located in the southeastern most sector of the Neuquén Basin. The field produces mainly gas and condensate from Lajas Fm. In this area, Lajas Fm. is characterized as a tight reservoir. Accumulation is explained from the proven petroleum system Los Molles - Lajas (!). Although estimated porosity is similar throughout the formation, only the lower section produces hydrocarbons. This suggests the hypothesis of a predominantly vertical migration through faults and fractures connecting source rock with reservoir levels of Lajas Fm. Characterization and delineation of source rock becomes then very important.A 55 km2 depocenter for Los Molles Fm. was located within the block based on lithological, geochemical and seismic characteristics. Los Molles Fm. is to be found in the condensate to gas window in the area. Wells with highest EURs in the field are located just above the depocenter.Play concept was recently adjusted after the drilling of two exploratory wells. Although petrophysical properties in both wells proved to be similar, oil and gas shows during drilling are completely different. Location from the depocenter differs in each well. Well #1 was drilled just above a thickness of at least 200 m of proven source rock, whilst well #2 was drilled 4 km away from the depocenter, above an area with no source potential for Los Molles Fm.Drilling of these two exploratory wells confirms the hypothesis of migration being mainly vertical from Los Molles Fm. source rock to Lajas Fm. tight reservoirs. Presence of thick levels of source rock immediately below pay levels is emphasized. Therefore, a complete characterization of Los Molles Fm. allows an optimization of the development plan. Play concept proven in EFO should be evaluated in other areas of the basin to check plausibility, and consequently improve development plans CONGTP Rosemblat, Amalia 58750 Utgé, Silvana 58751 Fernández Bell Fano, Francisco 58752 Galarza, Ariel 51925 Guerello, Rodolfo 55641 Congreso de Exploración y Desarrollo de Hidrocarburos (10mo. : 2018 nov. 5 - 9 : Mendoza) 573 Formación Lajas 885 Formación Los Molles 847 Migración vertical 58753 192811 192811 https://biblioteca.iapg.org.ar/ArchivosAdjuntos/Conexplor2018/1346.pdf 0 0 0 0 260530 CDIAPG CDIAPG 068.82 553.28 C62 2018 0015658 2026-03-06 200065114 0 068.82 553.28 C62 2018 0015658 200065114 2026-03-06 00:37:12 2026-03-06 ARCHIVO