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Open AccessArticle

Geochemical Analysis for Determining Total Organic Carbon Content Based on ∆LogR Technique in the South Pars Field

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Department of Petroleum Engineering, Mahabad Branch, Islamic Azad University, Mahabad 59135-433, Iran
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Department of Natural Resources Engineering and Management, School of Science and Engineering, University of Kurdistan Hewlêr (UKH), Erbil 44001, Kurdistan Region, Iraq
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Department of Reservoir Geology, National Iranian South Oil Company (NISOC), Ahwaz 61735-1333, Iran
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Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz 51666-16471, Iran
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Korea Polar Research Institute (KOPRI), Songdomirae-ro, Yeonsu-gu, Incheon 21990, Korea
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Institute of Oceanography and Environment (INOS), Universiti Malaysia Terengganu (UMT), Kuala Nerus 21030, Terengganu, Malaysia
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Department of Geosciences, Universiti Teknologi PETRONAS (UTP), Perak 32610, Malaysia
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Southeast Asia Carbonate Research Laboratory, Universiti Teknologi PETRONAS (UTP), Perak 32610, Malaysia
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(12), 735; https://doi.org/10.3390/min9120735
Received: 5 November 2019 / Revised: 25 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
There is a recognized need for the determination of total organic carbon (TOC) as an essential factor in the evaluation of source rocks. In this study, the ∆LogR technique was coupled with logging curves of sonic, resistivity, spectral gamma-ray (SGR), and computed gamma-ray (CGR) to determine an accurate content of TOC in the Gadvan Formation. Multiple linear regression analysis was also applied to the ∆LogR technique. To this aim, 14 samples of the Gadvan Formation were taken from Wells B and C in the South Pars field and analyzed using Rock-Eval pyrolysis. Results from the ∆LogR technique and multiple linear regression analysis, well logs, and Rock-Eval were compared to calculate the accurate content of TOC in the Gadvan Formation. Geochemical data confirmed that the Gadvan Formation was a relatively poor source rock in the South Pars field, as average TOC and Tmax values of the samples were 0.79 and less than 430 °C, respectively. Also, the content of potassium (K < 0.1%) confirmed the origin of the source rock as a pure carbonate, whereas the low content of thorium (Th < 5 ppm) was indicative of the percentage of clays. There was a moderate content of uranium (U < 10 ppm), suggesting that the Gadvan Formation was not deposited in an excellent reducing environment to conserve the organic matter. Moreover, the results from the integration of the multiple linear regression model with SGR and CGR showed that the value of R2 was higher than the results obtained without SGR and CGR. Findings from this study could help the exploration and production team to determine the accurate content of TOC using the ∆LogR technique in association with logging curves.
Keywords: geochemical analysis; ∆LogR; multiple regression analysis; TOC; Gadvan; the South Pars field geochemical analysis; ∆LogR; multiple regression analysis; TOC; Gadvan; the South Pars field
MDPI and ACS Style

Rahmani, O.; Khoshnoodkia, M.; Kadkhodaie, A.; Beiranvand Pour, A.; Tsegab, H. Geochemical Analysis for Determining Total Organic Carbon Content Based on ∆LogR Technique in the South Pars Field. Minerals 2019, 9, 735.

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