Interpreting Rock-Eval Pyrolysis Data Using Graphs of Pyrolizable Hydrocarbons vs. Total Organic Carbon (1)

Langford, F. F.; Blanc-Valleron, Marie-Madeleine

doi:10.1306/0c9b238f-1710-11d7-8645000102c1865d

Cited by 112 publications

(21 citation statements)

References 12 publications

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“…index (HI). Serving as a maturity indicator, T max is defined at the value of the S 2 peak (Langford and Blanc-Valleron, 1990). Finally, the production index (PI) and oil saturation index (OSI) parameters were determined for each sample: PI = S 1 / (S 1 + S 2 ); OSI = S 1 /TOC · 100 (Jarvie, 2012).…”

Section: Sample Collection and Analysismentioning

confidence: 99%

“…Plotting these results on an HI versus T max diagram ( Figure 6A; Espitalié et al, 1984) shows that the sample points are widely distributed within the regions characteristic of kerogen types II and III. Plotting S 2 versus TOC ( Figure 6B; Langford and Blanc-Valleron, 1990) results in an average "true" HI of approximately 396 mg HC /g TOC from the slope of the linear regression line (coefficient of determination [R 2 ] = 0.87). These data indicate a high degree of organic type heterogeneity within the shale lithofacies samples, this heterogeneity being especially evident when the sample TOC is less than 2 wt.…”

Section: Bulk Geochemical Parametersmentioning

confidence: 99%

“…Espitalié et al [1984]) outlining kerogen types and maturity of sedimentary rocks from the first member of the Qingshankou Formation. (B) Correlations between total organic carbon (TOC) and the amount of pyrolyzate released from kerogen (S 2 ) [according to Langford and Blanc-Valleron (1990)]. (C) Plot of T max and TOC.…”

Section: Mineralogy and Lithologymentioning

confidence: 99%

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Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

et al. 2019

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The lacustrine shale of the Upper Cretaceous Qingshankou Formation is the principal prospective unconventional target lithology, acting as source, reservoir, and seal. Lithofacies and associated storage capacity are two significant factors in shale oil prospectivity. This paper describes an investigation of the lower Qingshankou Formation lacustrine shale based on detailed description and analysis of cores, shale lithofacies characteristics, depositional setting, and stacking patterns.Seven lithofacies are recognized based on organic matter content, sedimentary structure, and mineralogy, all exhibiting rapid vertical and lateral changes controlled by the depositional setting and basin evolution. An overall trend from shallow-water to deep-water depositional environments is interpreted from the characteristics of the infilling sequences, characterized by increasing total organic carbon (TOC) and total clay content and decreasing layer thickness (i.e., from bedded to laminated then to massive sedimentary structures). Periods of deposition during shallowing cycles show a reverse trend in the sedimentary characteristics described above. The sedimentary rocks in the studied interval show three complete short-term cycles, each one containing progressive and regressive system tracts.

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Section: Sample Collection and Analysismentioning

confidence: 99%

Section: Bulk Geochemical Parametersmentioning

confidence: 99%

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Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

et al. 2019

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“…5) confirms that the Naokelekan formation in the Bj-1 well and Taq Taq-1 well is immature and lies within Type-II\III, while Jk-1 well samples are immature to over mature Type-II with few samples refer Type IV kerogens. On the other hand, the thermal maturity of organic matter can be assessed through the combined relationship between Tmax and the calculated Production İndex (PI) [15]. The cross plot of Tmax versus PI (Fig.…”

Section: Thermal Maturitymentioning

confidence: 99%

“…Nonindigenous hydrocarbons can be detected, if S1 is high and the TOC is low [15]. Therefore, TOC versus S1 diagram have been used to separates migrated from non-migrated hydrocarbons for the cutting samples taken from selected wells (Fig.…”

Section: Migrated Hydrocarbonsmentioning

confidence: 99%

Organic Geochemistry and Source Rock Potential of Naokelekan Formation in Selected Wells, North Iraq

Ismael

2018

AREES

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In this study, organic geochemical characteristics and potential of Upper Oxfordian–Lower Kimmeridgian aged bituminous shale beds in Naokelekan formation (North Iraq) were investigated by using TOC and pyrolysis analyses. The Total Organic Carbon (TOC) contents for the studied samples varying between from 0.46-21.33%, average 7.06% and Taq Taq-1 well as good hydrocarbon potential (0.85-1.66 %, with average of 1.06%), whereas Jk-1 well can be rated as an very good hydrocarbon potential from 1.04-4.16 %, with average of 2.15 %. The low Hydrogen Index (HI = 24-605 mg HC/g TOC) for Bj-1 well, (HI = 147-673 mg HC/g TOC) in the Jk-1 well while in Taq Taq-1 well (HI = 9-48 mg HC/g TOC) indicate that kerogen type for the vast majority of the studied samples is Type II/I for Bj-1 well and Type IV with few samples, Type of I and II kerogens in the Taq Taq-1 and Jk-1 well. Consequently most of the organic matter of Bj-1 and Jk-1 well tends to generate petrol, even though a small portion of them exhibit a tendency to generate gas. While all samples of Taq Taq-1 well tends to generate gas. The studied bituminous rock samples characterized by low Tmax (434-602 °C) for Bj-1,Taq Taq-1 (344-429 °C) and (419-602 °C) for Jk-1 well. These values show, in terms of potential of hydrocarbon generation, that the studied samples have a source rock potential of organic matter from immature to over mature. Additionally, the S1 hydrocarbon type values indicate no external contribution of migrated hydrocarbons to the bituminous rocks of the studied area.

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Source Rock Quality and Continuous Petroleum System in the Ranikot Formation (Kirthar Foldbelt, Pakistan) Based on Principal Organic Geochemistry

Makos¹,

Drozd

Noor³

et al. 2022

Advances in Science, Technology &Amp; Innovation

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Interpreting Rock-Eval Pyrolysis Data Using Graphs of Pyrolizable Hydrocarbons vs. Total Organic Carbon (1)

Cited by 112 publications

References 12 publications

Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

Organic Geochemistry and Source Rock Potential of Naokelekan Formation in Selected Wells, North Iraq

Source Rock Quality and Continuous Petroleum System in the Ranikot Formation (Kirthar Foldbelt, Pakistan) Based on Principal Organic Geochemistry

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