02982nmc a2200337 4500 20260520005441.0 260224s2018 xxu esp Español 068.82 553.28 C62 2018 0015648 Estudio del origen de resistividades anómalas en la formación Lajas 2018 30/06/2022 ; 27/02/2019 21 p. ; 557-578 Near Loma La Lata and Sierra Barrosa fields, Lajas Formation thickness reaches up to 1000m of sediment that includes fine to coarse sandstone to subordinated conglomerates with tight features including low porosity and permeability values, 0.001 to 0.03 mD.These reservoirs exhibit significant net pay, 150-300m, with high lithological, petrophysical and granulometrical complexity. An associated feature is the abnormal response of induction logs, resistivity, in some reservoir levels. This anomaly shows significant different values for the same reservoir level, in which the rest of logs don t́ behave the same (GR, PEF, porosity logs, etc). This behaivoir can t́ be explained by lithological changes or flow capacity variations, and historically it has been assigned to several fluids responses; consequently, those levels were left without stimulation. Based on the available cores and sidewall cores data from wells with this behavior, anintegrated analysis ispresented with the aim of find out what is causing the aforementioned anomaly, and to allow adding extra net pay. Petrographic studies, thin sections, X-ray diffraction and MEB, were integrated with petrophysical data and NMR logs, Neutron Magnetic Resonance. Also, Lithological and Icnological studies were used in the core samples.The results allowed to determine that high non-free water proportion included in nano and micropores from clay minerals, may be the cause of low resistivity anomalies. The parameters with highest influence are granulometry, clay content and pore size, more than total porosity. Compaction degree has also an important influence, showing low resistivity values related to warped clay chips and sutured grain contacts. CONGTP Arregui, Mariano 879 Bedini, Paula 880 Coppo, Romina 881 Montagna, Aldo 882 Rodríguez, Elizabeth 883 Santiago, Emiliano 884 Congreso de Exploración y Desarrollo de Hidrocarburos (10mo. : 2018 nov. 5 - 9 : Mendoza) 573 Simposio de Evaluación de Formaciones (2018 nov. 5 - 9 : Mendoza) 675 Congreso de Exploración y Desarrollo de Hidrocarburos (10mo. : 2018 nov. 5 - 9 : Mendoza) 573 Formación Lajas 885 Resistividad 886 Resistividades anómalas 887 128456 128456 https://biblioteca.iapg.org.ar/ArchivosAdjuntos/Conexplor2018/SEF/1445.pdf 0 0 0 0 199378 BVIAPG BVIAPG 068.82 553.28 C62 2018 0015648 2026-03-02 200064953 0 068.82 553.28 C62 2018 0015648 200064953 2026-03-02 23:32:02 2026-03-02 ARCHIVO