Hot shale in an ice world: Paleoceanographic evolution of the northern Gondwana margin during the early Paleozoic (Tanezzuft Formation, Tunisia)

Gambacorta, Gabriele; Caronni, V.; Antonielli, E.; Massara, Elisabetta Previde; Riva, A.; Scotti, Paolo; Trincianti, E.; Erba, Elisabetta

doi:10.1016/j.marpetgeo.2016.02.015

Cited by 16 publications

(1 citation statement)

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“…The SGR is a powerful tool in estimating the mineralogy, picking stratigraphic surfaces, and evaluating the depositional conditions [9,10]. Referring to depositional conditions of source rocks, U values differ from free to rich depending on oxidizing or reducing environments [11]. While shales are present in the interval of source rocks, radioactivity elements are amplified.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Section: Introductionmentioning

confidence: 99%