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  • Total organic carbon (TOC)
    The table below<ref name=ch06r3 /> shows average TOC values for different sedimentary rock types. ! Rock type || TOC value, %
    3 KB (428 words) - 16:33, 13 April 2022

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  • LECO method in estimating richness
    ...rbon (TOC)]] uses an instrument known as a LECO carbon analyzer to measure TOC values by combusting the organic carbon and measuring the resulting carbon ==Measuring TOC with LECO==
    2 KB (354 words) - 15:49, 9 February 2022
  • Source rock richness
    ...on techniques of analyzing a rock for TOC are [[Rock-Eval pyrolysis]] with TOC and the [[LECO method in estimating richness|LECO method]]. Conventional we
    1 KB (179 words) - 21:39, 4 February 2022
  • Van Krevelen diagram
    ...nic carbon (TOC)|TOC]]) is plotted versus [[hydrogen index]] ([HI] mg HC/g TOC).<ref name=Petersetal_2012>Peters, Kenneth E., David J. Curry, and Marek Ka
    1 KB (194 words) - 15:46, 8 March 2016
  • Type I kerogen
    ...indices greater than 600 mg [[hydrocarbon]]\g [[total organic carbon (TOC)|TOC]] when thermally immature; contains algal and bacterial input dominated by
    1 KB (176 words) - 21:06, 6 July 2015
  • Total organic carbon (TOC)
    The table below<ref name=ch06r3 /> shows average TOC values for different sedimentary rock types. ! Rock type || TOC value, %
    3 KB (428 words) - 16:33, 13 April 2022
  • Type IV kerogen
    ...rogen]] indices below 50 mg [[hydrocarbon]]/g [[total organic carbon (TOC)|TOC]] in thermally immature rocks; dominated by organic matter that was recycle
    1 KB (185 words) - 21:11, 6 July 2015
  • Type II kerogen
    ...the range of 300 to 600 mg [[hydrocarbon]]\g [[total organic carbon (TOC)|TOC]] when thermally immature; contains algal and bacterial organic matter domi
    1 KB (181 words) - 21:10, 6 July 2015
  • Type III kerogen
    ...n the range of 50 to 200 mg [[hydrocarbon]]\g [[total organic carbon (TOC)|TOC]] when thermally immature; generally contains higher plant organic matter d
    1 KB (180 words) - 21:11, 6 July 2015
  • Hydrogen Index (HI)
    :<math>\mbox{HI} = \mbox{S2} / \mbox{TOC} \times 100</math> ...nalyses.html NL Oil and Gas Portal]</ref> and [[Total organic carbon (TOC)|TOC]] is total organic carbon in %.
    3 KB (409 words) - 15:33, 10 February 2022
  • Rock Eval analysis using hydrogen index (HI) and oxygen index (OI)
    ...and carbon. Therefore, once we know the amount of [[total organic carbon (TOC)]] present in a rock, we then need to know the amount of hydrogen present i :<math>\mbox{HI} = \mbox{S2} \mbox{ (Mg/g)}/\%\mbox{TOC} \times 100</math>
    3 KB (525 words) - 18:09, 9 February 2022
  • Expulsion efficiency estimation
    ...sion efficiencies tend to increase with increasing [[total organic carbon (TOC)]]. Expulsion efficiencies for oil and gas can be as high as 70-80% for ver ...he original kerogen content of the rock using [[total organic carbon (TOC)|TOC]] values measured from source rock samples.
    4 KB (569 words) - 21:54, 14 February 2022
  • Primary migration and compositional changes
    * High levels of [[total organic carbon (TOC)]] * Low [[Total organic carbon (TOC)]]
    3 KB (438 words) - 15:17, 14 February 2022
  • AAPG Wiki:Wikification
    {{TOC limit|2}} | || Limit TOC if too many sections
    8 KB (1,043 words) - 14:09, 6 August 2013
  • Source rock
    ...ic matter is commonly assessed by a measure of the [[total organic carbon (TOC)]] contained in a rock. Quality is measured by determining the types of [[k | Quantity of source rock || Total organic carbon (TOC) present in the source rock
    4 KB (569 words) - 21:38, 4 February 2022
  • Using conventional well logs to estimate richness
    ...table measurement technique. Using the calibrated logs, we can extrapolate TOC values to uncalibrated logs to estimate source rock richness over large are
    5 KB (768 words) - 15:48, 9 February 2022
  • Rock-Eval pyrolysis
    The percent [[total organic carbon (TOC)]] is actually a value that is calculated, not measured directly, using the :<math>\%\mbox{TOC} = [0.082(\mbox{S1} + \mbox{S2}) + \mbox{S4}]/10</math>
    4 KB (573 words) - 18:22, 8 February 2022
  • Utica Shale, Ohio, Pennsylvania, West Virginia and Kentucky
    ...st in the organic rich Point Pleasant interval ranging from 3% to 12%. The TOC increases to the east and to the southeast. This same interval is an organi
    3 KB (542 words) - 22:36, 4 March 2022
  • China Shale Gas & Liquids - Sichuan Basin
    ...ommercially producing shale interval has a thickness of 20-40m, an average TOC content of 2-4%, vitrinite reflectance (Ro) of 2-3.5%, porosity of 1.85-8.3 ...for good gas preservation conditions. In summary, the combination of high TOC content, high quartz content, high porosity and good gas preservation condi
    7 KB (985 words) - 18:54, 4 December 2023
  • Australia, Northern TerritoryVelkerri Formation, Beetaloo Sub-basin
    ...rvals of the Velkerri Formation with hydrogen index as high as 800 mg HC/g TOC. Peak hydrocarbon generation is estimated to occur at thermal maturity quan
    11 KB (1,597 words) - 15:02, 9 January 2024
  • China Shale Gas & Liquids - Bohai Bay Basin
    ...ood-very good source rock containing Type I-II kerogen, in average of 3.6% TOC, and at the oil-mature stage with 0.68% to 1.16% Ro (Zhao et al., 2018). Th ...31% (Song et al., 2015). The lacustrine Shahejie shale contains 1.5-19.6% TOC in general of Type I-II organic matter origin and mainly at the immature to
    8 KB (1,251 words) - 15:51, 14 March 2022
  • Organic facies
    ...C (at % R<sub>o</sub> = 0.5) || H (mg HC/g TOC) || Ol (mg CO<sub>2</sub>/g TOC) ...netrates beyond the observable changes in color and induration and reduces TOC and HI values. It appears that the quantity and quality of all are diminish
    17 KB (2,472 words) - 17:39, 13 April 2022
  • Haynesville and Bossier Shales (Upper Jurassic), East Texas and Northwest Louisiana
    ...he “sweet spot” related to higher percent weight of total organic content (TOC), higher average total porosity and higher original gas in place (OGIP; Fig
    4 KB (628 words) - 23:05, 3 March 2022
  • Geological fieldwork benefits
    ...shale samples, for example, when analyzed for age, [[Total organic carbon (TOC)|organic richness]], and acoustic velocity can advance the understanding of
    5 KB (771 words) - 21:12, 1 February 2022
  • Silurian Qusaiba shales
    ...ain]] Formations as the principal source rocks, with an average resident [[TOC]] content of about 3.5 wt.%, and sometimes as high as 14.3 wt.% (Cantrell e ...ntains poor to moderate [[organic]] richness (up to a few weight percent [[TOC]]) with mixed oil and gas potential (Cole et al., 1994)<ref name=Coleetal19
    18 KB (2,569 words) - 22:50, 8 January 2019
  • Super basins
    ...uality oil-prone marine kerogen) and the Early Cretaceous Agrio Formation (TOC 2%–5%). Superimposed petroleum systems, combined with different structura ...n-Turonian Eagle Ford- Tuscaloosa super sequence has black shales and 4-7% TOC. These rocks also work as unconventional reservoirs. Three main reservoirs
    27 KB (3,791 words) - 19:35, 11 October 2022
  • Iran petroleum systems
    ...At Kuh-e Bangestan, where the oil window was reached (Tmax 443°C), current TOC varies between 3.1 and 4.4%, and current HI varies from 190 to 260 g HC/kg ...with the isopach map of the Hanifa–Tuwaiq Mountain and Diyab source rocks (TOC in excess of 1%), their current thermal maturity expressed as vitrinite ref
    27 KB (3,901 words) - 13:51, 26 January 2017
  • Petroleum basins of Turkey
    ...pper Silurian-Lower Devonian (D1, D2, and D3) are considered for analysis. TOC values are as follows: * B3 has six samples analyzed. TOC values vary from 0.14% to 0.38% and the mean is 0.25% ± 0.09%. This level
    52 KB (7,769 words) - 20:28, 18 January 2017
  • Shale-gas resource systems
    ...TOC) and porosity. The Montney Shale shows poor and inverse correlation to TOC, whereas the Doig Phosphate shows good and positive correlation indicative ...een expelled, assuming an original [[hydrogen index]] (HIo) of 434 mg HC/g TOC. By difference, this suggests that 40% of the generated petroleum was retai
    73 KB (10,728 words) - 18:16, 11 January 2024
  • Bakken and Three Forks Formations, Williston Basin, North Dakota and Montana
    ...hales of the Bakken, which average approximately 11% total organic carbon (TOC) and contain Type II kerogen. The primary reservoir targets are the low por
    7 KB (1,004 words) - 22:08, 4 March 2022
  • Marcellus Shale (Devonian) -- Appalachian Basin
    ...rcellus Shale. Published data indicates the total organic carbon content (TOC) of the Marcellus Shale is as high as 11% (Repetski and others, 2008). As r ...re and others (2015), in northern West Virginia, the total organic carbon (TOC) content is generally 10% or greater, and reservoir pressures range from 0.
    19 KB (2,773 words) - 21:36, 4 March 2022
  • Shale-oil resource systems
    ...ined by organic carbon. It is postulated that as much as 70 to 80 mg oil/g TOC is retained by organic-rich source rocks, thereby limiting producibility in ...ntents without performing the solvent extraction procedures and a separate TOC analysis. In this approach, free oil from the rock is thermally vaporized a
    97 KB (14,873 words) - 19:53, 11 January 2024
  • Mudstones
    ...TOC] versus uranium; clay minerals versus thorium or potassium; pyrite and TOC versus bulk density; after Bohacs et al. .<ref name=Bhcs2014a />). Oc. Chem
    16 KB (2,352 words) - 18:46, 4 December 2023
  • Vaca Muerta, La Luna Shale, South America
    ...highest producing wells in the play occur outside of the areas of thickest TOC accumulation (Figure 8). Recognition of these concepts and resultant explor
    11 KB (1,644 words) - 16:14, 11 May 2023
  • Bakken and Three Forks Formations, Williston Basin, North Dakota and Montana (USGS)
    | TOC (wt%) || Avg 11% for Upper and Lower Bakken shales
    11 KB (1,595 words) - 20:20, 2 June 2021
  • Petroleum source rocks
    ...urce rocks are evaluated by their carbon richness as total organic carbon (TOC) in weight percent (wt. %). They are also evaluated by their hydrogen richn
    12 KB (1,616 words) - 17:35, 13 April 2022
  • Vaca Muerta play
    ...rocks in these sectors show the best reservoir characteristics (averages: TOC 5%; porosity 12%; clay 10%–20%; water saturation 20%), the most adequate ...aca Muerta Formation (VMF). (D) Thickness of the organic-rich section (>2% TOC) (OVM). (E) Line drawing showing the Vaca Muerta-Quintuco system (VMQS), th
    77 KB (11,201 words) - 20:07, 15 January 2024
  • Appalachian Basin Marcellus gas play
    # Total organic carbon (TOC) content ...n (abs.)]: AAPG Eastern Section meeting.</ref> suggest calculated original TOC contents in the Marcellus Shale to be in the 4 to 20% range.
    89 KB (13,415 words) - 19:16, 16 January 2024
  • Mudstone nomenclature
    ...ox Formation in the Paradox Basin of southeastern Utah, where the original TOC content ranges in the same bed from 1 to 4 wt. % over a distance of 3 km<re
    58 KB (8,391 words) - 19:46, 20 February 2024
  • Basin modeling: identifying and quantifying significant uncertainties
    * Thickness, original [[total organic carbon (TOC)|total organic carbon]] and [[hydrogen index]] ...en]] index of the [[source rock]]; oTOC = original [[total organic carbon (TOC)|total organic carbon]] content of the source rock; OMT = organic matter ty
    38 KB (5,890 words) - 15:16, 23 August 2016
  • Kerogen
    ...matrix effect related to organic richness occur in whole-rock samples with TOC values less than 10%.<ref name=Esptl1980 /><ref name=Hrsfld1980 /><ref name
    17 KB (2,363 words) - 17:40, 9 February 2022
  • The Neuquén Basin: Sequence Stratigraphy of Vaca Muerta Formation
    ...n, carbonate platform facies; Vaca Muerta Formation, slope facies and high TOC.<ref name=Galeazzi>Galeazzi, S., F. Pose, & A. Gangui, 2014, Estratigrafía
    16 KB (2,490 words) - 15:32, 8 January 2021
  • Gas chromatography: data obtained
    {{Limit TOC|2}}
    22 KB (3,123 words) - 21:38, 15 February 2022
  • Wattenberg field
    ...Shale. Total source rock thickness in Wattenberg is 200 to 250 ft (>2 wt.% TOC). The source beds are dominantly Type II with some Type III kerogen present ...than the marls. This is attributed to higher clay and total organic clay (TOC) in the marls compared to the chalks. The chalks tend to have higher resist
    72 KB (10,249 words) - 20:06, 15 January 2024
  • West Texas Super Basin
    ...d higher total TOC in the Wolfcamp A versus argillaceous mudrock and lower TOC in the Wolfcamp B. Also shown are the thicker, amalgamated debrites, carbon ...esource reservoir play. These are that although the Woodford has some high TOC values and is perhaps the most regional of the potential West Texas Basin s
    157 KB (23,278 words) - 18:36, 16 January 2024
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