Uncovering The Potential of Low Resistivity Reservoirs Through Integrated Analysis: A Case Study from The Talang Akar Formation in The South Sumatra Basin

Fiqya Fairuz Zaemi, Rian Cahya Rohmana, Widi Atmoko


The study area is an oil and gas field that has a low resistivity reservoir zone in the Talang Akar

Formation, South Sumatera Basin. The reservoir zone is composed of siltstone and sandstone that was deposited

in a shallow to transitional marine environment. The aim of this study is to identify and determine the potential of

low resistivity reservoirs in the study formation. The data used in the study include well log, mud log, core data

(porosity, permeability, petrography), formation water analysis, and biostratigraphy. The methodology includes

qualitative analysis to determine reservoir potential zones (quick look interpretation) and the reason for low resistivity

reservoirs, as well as quantitative analysis to calculate petrophysical parameters. The results of the quick

look analysis showed 77 low resistivity reservoir zones, but the petrophysical analysis identified 25 low resistivity

reservoir zones as potential candidates for drill steam test (DST). Factors causing low resistivity reservoirs in

the study area include clay mineral content (kaolinite and illite), conductive minerals (pyrite and siderite), high

salinity formation water (>10,000 ppm), very fine to medium sand grain size (0.063 - 0.5 mm) distribution of

clay minerals (laminated and dispersed clay), and thin laminates. The results of the petrophysical analysis show

that shale volume is less than 30%, porosity is greater than 14%, permeability is greater than 10 mD, and water

saturation is less than 70%.


Formation Evaluation, Low Resistivity, Petrophysics, Talang Akar Formation

Full Text:



Adiyat, R. M. (2018). Paleogeographic stratigraphic

sequence analysis in the RMA field based on log

and seismic data of the Talang Akar Formation,

South Sumatra Basin. Universitas Indonesia.

Aryanto, M. D., Darsono, D., Julikah, J., & Purba,

H. (2014). Reservoir Characterization Using Simultaneous

Inversion to Delineate Hydrocarbon

Reservoir. Scientific Contributions Oil and Gas,

(3), 185-194.

Bai, Z., Tan, M., Li, G., & Shi, Y. (2019). Analysis

of low-resistivity oil pay and fluid typing method

of Chang 81 Member, Yanchang Formation in

Huanxian area, Ordos Basin, China. Journal of

Petroleum Science and Engineering, 175, 1099-

Bishop, M. G. (2001). South sumatra basin province,

indonesia: the lahat/talang akar-cenozoic total

petroleum system. Denver, Colorado, USA: US

Geological Survey.

Boyd, A., Darling, H., Tabanou, J., Davis, B.,

Lyon, B., Flaum, C., Klein, J., Sneider, R. M.,

Sibbit, A., & Singer, J. (1995). The Lowdown

on Low-Resistivity Pay. Oilfield Review 7, no 3.

Chu, W.C., Steckhan, J. (2011). A practical approach

to determine low-resistivity pay in clastic

reservoirs. SPE Annual Technical Conf. and

Exhibition, Denver, Colorado, USA.

Das, B., Chatterjee, R. (2018). Well log data

analysis for lithology and fluid identification in

Krishna-Godavari Basin, India. Arab. J. Geosci.

(10) 1866-7511.

Evdokimova E. (2013). Log Evaluation in Low Resistivity

Formation of Tomsk Region Oil Fields.

SPE Annual Technical Conference and Exhibition,

New Orleans, Louisiana, USA.

Fan, Z.Q., Yang, G.P., Ding, X., Yang, L., Zhou,

W., Zhu, Y.J., Yang, Q.W., Sun, J.W. (2015.)

The well fluid identification method and its

application for tight sandstone gas reservoir of

Shan 2 reservoir in Zizhou gasfield. Natural Gas

Geoscience 26 (6), 1113–1119.

Gai, S., Liu, H., He, S., Mo, S., Lei, G., Huang,

X., Yang, Y. & Liu, R. (2015). Reinterpreting

the Low-resistivity Reservoir by Using New

Logging Model: A Case Study from a Block in

Sulige Tight Gas Field. SPE Middle East Oil &

Gas Show and Conference.

Gandhi, A., Kubik, P., Termina, J.J., Rocque, T.,

Volkmar, M. (2011). Low resistivity petrophysical

mapping expands the terry (sussex) play in

Wattenberg field. Colorado SPWLA 52nd Annual

Logging Symp, pp. 14–18.

Holis, Z., Prayogi, A., Purwaman, I., & Damayanti,

S. (2016). The Petrophysic Role of Low

Resistivity Pay Zone of Talang Akar Formation,

South Sumatera Basin, Indonesia. Society of

Petroleum Engineers. SPE-182448-MS

Julikah, J., Sriwidjaya, S., Hadimuljono, J. S., &

Panuju, P. (2015). Hydrocarbon Shale Potential

In Talang Akar And Lahat Formations On South

And Central Palembang Sub Basin. Scientific

Contributions Oil and Gas, 38(3), 213-223.

Melfi, F. M., Setyowiyoto, J., Wintolo, D., & H, M.

Y. H. (2017). Evaluasi petrofisika low-resistivity

pada potensi reservoir hidrokarbon formasi gumai

cekungan sumatera selatan. Seminar Nasional

Kebumian Ke-10, September, 590–599.

Ming, L., Haimin, G., Jun, L., Hong, Y., En, X., &

Yun, Y. (2013). A method to identify low resistivity

reservoir for the N1 reservoir of Shizigou

oilfield of northwest Qaidam. Proceedings - 2013

International Conference on Computational and

Information Sciences, ICCIS 2013,1257–1260.

Oifoghe S. (2014). Challenges in Identifyng and

Quantifying Hidrocarbons in Thinly Bedded,

Laminated, and Low-Resistivity Pay Zones. OTC

Asia held in Kuala Lumpur, Malaysia.

Rajput, S., Bt Abdullah, I., Roy, A., B Khalid, A.,

Onn, C., & Khalil, A. (2019). Characterizing

Thinly-Bedded Low Resistivity Reservoirs in

Mature Fields. In SPE Annual Technical Conference

and Exhibition.

Rohmana, R. C., Setyowiyoto, J., Husein, S., Indra,

Y., & Ramadhan, A. (2017). Evaluasi dan

perbandingan reservoir low-resistivity formasi

cibulakan atas, cekungan jawa barat utara dengan

formasi gumai, sub-cekungan jambi. Seminar

Nasional Kebumian Ke-10, September.

Su-juan, Jing (2009). The well log interpretation

research of low resistivity gas zone in the Sulige

eastern area. Chang’an University, Xi’an, China.

United States Geological Survey. (2018). Saline

Water and Salinity. From: https://www.usgs.



DOI: https://doi.org/10.29017/SCOG.45.3.1258

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.