Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10874810.54859/kjogi108748Research ArticleFeatures of isolation and nature of low-resistivity oil-saturated reservoirs of the Middle Jurassic deposits of the Akshabulak Central field of the South Torgai oil and gas basinDzhumagaliyevaAinagul K.a.jumagaliyeva@kmge.kzhttps://orcid.org/0009-0004-4703-1469NyssangaliyevaShynar O.sh.nysangalieva@kmge.kzhttps://orcid.org/0009-0004-0455-7161AkhmetovDuman A.<p>PhD</p>dakhmetov@kgm.kzhttps://orcid.org/0000-0002-3398-4670SagindykovKairat I.ksagyndykov@kgm.kzhttps://orcid.org/0009-0001-5645-2626MardanovAltynbek S.a.mardanov@kmge.kzhttps://orcid.org/0000-0002-8342-3046JaxylykovTalgat S.t.jaxylykov@kmge.kzhttps://orcid.org/0000-0002-1530-3974MurzagaliyevaZhansaya S.zh.murzagaliyeva@kmge.kzhttps://orcid.org/0000-0002-2657-8324Atyrau branch of KMG EngineeringKazGerMunai151220246425380205202412122024Copyright © 2024, Dzhumagaliyeva A.K., Nyssangaliyeva S.O., Akhmetov D.A., Sagindykov K.I., Mardanov A.S., Jaxylykov T.S., Murzagaliyeva Z.S.2024<p>At the current stage of development of the oil and gas industry of our country, additional exploration of existing fields, understudied promising areas, identification of missed horizons, methods of evaluation and development</p> <p>of non-standard reservoirs are of particular relevance. Reservoirs with low specific electrical resistivity can be referred to non-standard reservoirs, and there are some difficulties in assessing hydrocarbon prospects of these reservoirs. Low resistivity reservoirs can be productive reservoirs with high residual water saturation as well as reservoirs for which generally accepted interpretation techniques are ineffective. Proper analysis of the reasons that lead to underestimation of the resistivity of productive reservoirs allows choosing the most effective interpretation methods.</p> <p>The article is devoted to the study of the features of reservoirs with low electrical resistivity, their nature and role in the process of fluid accumulation. The basic methods of identification of low resistivity zones in reservoir rocks, their physical and chemical characteristics that cause low resistivity, including mineralogical composition, saturation, porosity, permeability and pore space structure, are considered, and their influence on the filtration-capacitance characteristics is analyzed. Approaches to integrating data from various methods (geophysical and geological-technological studies, laboratory measurements) are described. Special attention is paid to the influence of low resistivity on the interpretation of data from geophysical methods. The results of the study have significant practical potential for optimization of field development.</p>low resistivity reservoirresistivitygeophysical well testingoil saturationsandstonemineralsтөмен омдық коллекторменшікті электр кедергісіұңғымаларды геофизикалық зерттеумұнай қанықтылығықұмтасминералдарнизкоомный коллекторудельное электрическое сопротивлениегеофизические исследования скважиннефтенасыщенностьпесчаникминералы1.Oshlakova AS. Analiz geofizicheskikh i ekspluatatsionnykh dannyh nizkoomnyh kollektorov. Bulletin of the Tomsk Polytechnic University. 2011;315(1):68–72. (In Russ).2.Malinovskiy YM. Neftegazovaya litologiya. Moscow : RUDN; 2009. 217 p.3.Semenov VV, Pitkevich VT, Mel'nik IA, Sokolova KI. Issledovaniye nizkoomnykh kollektorov s ispol'zovaniyem dannykh kernovogo materiala i NKT. Geophysics. 2006;2:42–47. (In Russ).4.Chikishev AY, Chikishev YA, Kovaleva NP, et al. Prichina nalichiya nizkoomnykh kollektorov yurskikh otlozheniy Kaimysovskogo svoda. Oil Industry. 2006;8:42–45. (In Russ).5.Dobrynin VM, Vendel'shtein BY, Kozhevnikov DA. Petrophizika (phizika gornykh porod). Uchebnik dlya VUZov. Moscow : Izd-vo «Neft' i gaz» RGU nefti i gaza im.I.M. Gubkina; 2004. 368 p. (In Russ).6.Mel'nik IA. Prichiny ponizheniya elektricheskogo soprotivleniya v nizkoomnyh kollektorah. Geophysical research. 2014;15(4):44–53. (In Russ).7.Yezhova AV. Metodika otsenki neftenasyshchennosti nizkoomnykh kollektorov v yurskih otlshozheniyakh Yugo-Vostoka Zapadno-Sibirskoy plity. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering. 2006;309(6):23–26. (In Russ).8.Yezhova AV, Libina VF, Borkun FY, Sal'nikova NI. Vliyaniye sul'fidnykh obrazovaniy na petrofizicheskiye svoistva kollektorov gorizonta Yu-1. Tomsk: TPU; 1991. 162 p. (In Russ).9.Gusev SI. Analiz prichin, privodyashchikh k snizheniyu udel'nogo elektricheskogo soprotivleniya produktivnykh kollektorov. Oilfield engineering. 2016;5.:36–40. (In Russ).10.Zaripov OG, Sonich VP. Vliyaniye litologii porod-kollektorov na udel'noe elektricheskoye soprotivleniye plastov. Oil Industry. 2001;9:18–21. (In Russ).