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|+{{table number|1}}P90, P50, and P10 values for HI<sub>o</sub> for a worldwide collection of marine source rocks.
|+{{table number|1.}}P90, P50, and P10 values for HI<sub>o</sub> for a worldwide collection of marine source rocks.
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! || HI<sub>o</sub> (mg HC/g TOC) || GOC% of TOC<sub>o</sub> || NGOC% of TOC<sub>o</sub>
! || HI<sub>o</sub> (mg HC/g TOC) || GOC% of TOC<sub>o</sub> || NGOC% of TOC<sub>o</sub>
{| class=wikitable
{| class=wikitable
|+{{table number|2}}Computation of original TOC from measured TOC and Rock-Eval data.
|+{{table number|2.}}Computation of original TOC from measured TOC and Rock-Eval data.
! Geochemical Description || Value || Derivation
! Geochemical Description || Value || Derivation
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| S2<sub>o</sub> (in boe/af) || 595 || boe/af <math>(\text{S}2_{\text{o}} \times 21.89)</math>
| S2<sub>o</sub> (in boe/af) || 595 || boe/af <math>(\text{S}2_{\text{o}} \times 21.89)</math>
|}
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<sup>TOC = total organic carbon; HI = hydrogen index; subscript ‘‘o’’ = original value; subscript ‘‘pd’’ = present-day measured or computed value; TR = transformation ratio, the change in original HI, where TR = (HI<sub>o</sub>HIpd)/HI<sub>o</sub>; GOC = generative organic carbon (in weight percentage); NGOC = nongenerative organic carbon (in weight percentage); bkfree = bitumen- and kerogen-free TOC values; subscript ‘‘NGOCcorrection’’ = minor correction to TOCpd for added carbonaceous char from bitumen and/or oil cracking. S1 = Rock-Eval measured oil contents; S2 = Rock-Eval measured kerogen yields; boe/af = bbl of oil equivalent per acre-ft.</sup>
<sup>TOC = total organic carbon; HI = hydrogen index; subscript ‘‘o’’ = original value; subscript ‘‘pd’’ = present-day measured or computed value; TR = transformation ratio, the change in original HI, where TR = (HI<sub>o</sub>HIpd)/HI<sub>o</sub>; GOC = generative organic carbon (in weight percentage); NGOC = nongenerative organic carbon (in weight percentage); bkfree = bitumen- and kerogen-free TOC values; subscript ‘‘NGOCcorrection’’ = minor correction to TOCpd for added carbonaceous char from bitumen and/or oil cracking. S1 = Rock-Eval measured oil contents; S2 = Rock-Eval measured kerogen yields; boe/af = bbl of oil equivalent per acre-ft.</sup>
This nomograph provides a pragmatic method for estimating the elusive TOCo value and the original generation potential via determination of GOCo values when combined with either measured or estimated HI<sub>o</sub> data or using a sensitivity analysis via P10, P50, and P90 HI<sub>o</sub> values in the absence of other data. This is important because the total generation potential of the source rock can be estimated with these assumptions, and as such, the amount retained in the organic-rich shale can be estimated, that is, GIP, as well as the expelled amounts that may be recovered in a hybrid shale-gas resource system.
This nomograph provides a pragmatic method for estimating the elusive TOCo value and the original generation potential via determination of GOCo values when combined with either measured or estimated HI<sub>o</sub> data or using a sensitivity analysis via P10, P50, and P90 HI<sub>o</sub> values in the absence of other data. This is important because the total generation potential of the source rock can be estimated with these assumptions, and as such, the amount retained in the organic-rich shale can be estimated, that is, GIP, as well as the expelled amounts that may be recovered in a hybrid shale-gas resource system.
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{| class=wikitable
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|+ {{table number|4}}Original hydrogen index, present-day TOC, original TOC, and P50-derived original TOC for top 10 shale-gas systems.
|+ {{table number|4.}}Original hydrogen index, present-day TOC, original TOC, and P50-derived original TOC for top 10 shale-gas systems.
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! rowspan = 2 | Formation || rowspan = 2 | System or Series || rowspan = 2 | HI<sub>o</sub> (mg/g) || rowspan = 2 | TOC<sub>pd</sub> High (wt. %) || rowspan = 2 | TOC<sub>pd</sub> Low (wt. %) || rowspan = 2 | TOC<sub>pd</sub> Average (wt. %) || rowspan = 2 | Standard Deviation (wt. %) || rowspan = 2 | %GOC || rowspan = 2 | %NGOC || colspan = 3 | TOC<sub>o</sub> Values || P50 (HI = 475)
! rowspan = 2 | Formation || rowspan = 2 | System or Series || rowspan = 2 | HI<sub>o</sub> (mg/g) || rowspan = 2 | TOC<sub>pd</sub> High (wt. %) || rowspan = 2 | TOC<sub>pd</sub> Low (wt. %) || rowspan = 2 | TOC<sub>pd</sub> Average (wt. %) || rowspan = 2 | Standard Deviation (wt. %) || rowspan = 2 | %GOC || rowspan = 2 | %NGOC || colspan = 3 | TOC<sub>o</sub> Values || P50 (HI = 475)
{| class=wikitable
{| class=wikitable
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|+ {{table number|5}}Available characteristics of the top 10 shale-gas resource systems in core-producing areas of each basin.
|+ {{table number|5.}}Available characteristics of the top 10 shale-gas resource systems in core-producing areas of each basin.
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! Shale || Marcellus || Haynesville || Bossier || Barnett || Fayetteville || Muskwa || Woodford || Eagle Ford || Utica || Montney
! Shale || Marcellus || Haynesville || Bossier || Barnett || Fayetteville || Muskwa || Woodford || Eagle Ford || Utica || Montney