Isotopic reversal (‘rollover’) in shale gases produced from the Mississippian Barnett and Fayetteville formations

Zumberge, J. Alex; Ferworn, Kevin; Brown, Stephen

doi:10.1016/j.marpetgeo.2011.06.009

Cited by 282 publications

(211 citation statements)

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“…The isotope reversal occurs in Shanxi Formation gas (Fig. 5b), also generally in the North America's shale gas (isotope values of ethane and propane become more negative with the increase of maturation) or reversal (δ 13 C 2 < δ 13 C 1 ) in high or over mature stage (Ferwond et al, 2008;Zumberge et al, 2012, Tilley and Muehlenbachs, 2013, Hao and Zou, 2013Xia et al, 2013;Burrows anhd Laughey, 2010), as well as in the shale gas in Longmaxi Formation and other associated conventional gas in the Sichuan Basin (Dai et al, 2014;Dai et al, 2010). Isotope rollover or reversal is closely related to secondary cracking (Tilley et al, 2011;Tilley and Muehlenbachs, 2013;Ferwond et al, 2008, Hao andZou, 2013;Xia et al, 2013;Rodriguez and Philip, 2010).…”

Section: Characteristics Of Light Hydrocarbon In Shale Gasmentioning

confidence: 98%

“…Shale gas with typical positive carbon isotope sequence (a) and shale gas with typical reversed carbon isotope sequence (b). (Shale gas data of North America from Hill et al, 2007;Osborn and McIntosh, 2010;Zumberge et al, 2012;Rodriguez and Philip, 2010;Tilley and Muehlenbachs, 2013. Similarly hereinafter).…”

Section: Characteristics Of Light Hydrocarbon In Shale Gasmentioning

confidence: 99%

“…(Data of 6 (a) is from Kong, 2013;Xia et al, 2013;Yang et al, 2009;Dai et al, 2003;Zou et al, 2007. Data of 6 (b) is from Tilley and Muehlenbachs, 2013;Ferwond et al, 2008;Rodriguez and Philip, 2010;Zumberge et al, 2012;Osborn and McIntosh, 2010;Burruss and Laughrey, 2010;Dai et al, 2014). Table 3.…”

Section: Geochemical Characteristics Of Shale Gas In Xiasiwan Area Omentioning

confidence: 99%

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Geochemical Characteristics of Shale Gas in Xiasiwan Area, Ordos Basin

Dong

et al. 2015

Energy Exploration & Exploitation

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Well head gas samples from nine shale gas wells in Xiasiwan area were collected to examine their geochemical characteristics through analyzing their composition, carbon and hydrogen isotopes, and light hydrocarbon. The study shows the shale gas from Yanchang Formation is wet gas from primary cracking of sapropelic kerogen, and the shale system, still a closed system, has expelled only small amount of gas, and thermal maturity is the paramount factor restricting shale gas exploration; the shale gas from Shanxi Formation is dry coal-derived gas from secondary cracking, characterized by isotope reversal and δ 13 C 2 of less than -29‰, which proves that the ethane's carbon isotope of coalderived gas can be very low in high or over mature stage. A similar isotope "rollover" phenomenon in shale gas has also been observed in conventional gas of the Ordos Basin, so it is concluded that the gas in Lower Paleozoic is coalderived gas and the 13 C light ethane is the result of secondary cracking instead of mixing with oil-associated gas. Analysis of some indexes (such as δ 13 C 1 , δ 13 C 2 -δ 13 C 1 and light hydrocarbon) shows that the recoverable resources of shale gas in the mature stage are overestimated.

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Section: Characteristics Of Light Hydrocarbon In Shale Gasmentioning

confidence: 98%

Section: Characteristics Of Light Hydrocarbon In Shale Gasmentioning

confidence: 99%

Section: Geochemical Characteristics Of Shale Gas In Xiasiwan Area Omentioning

confidence: 99%

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Geochemical Characteristics of Shale Gas in Xiasiwan Area, Ordos Basin

Dong

et al. 2015

Energy Exploration & Exploitation

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“…Productive shale gas formations in North America generally have 4 2.0% TOC, type II kerogen, and 41.3% (vitrinite reflectance equivalent) thermal maturity (Zumberge et al, 2012). However, the geological settings of organic-rich, marine shale formations in China are distinct from those in North America.…”

Section: Introductionmentioning

confidence: 99%

The origin and evolution of thermogenic gases in organic-rich marine shales

Xiong

Zhang

Chen

et al. 2016

Journal of Petroleum Science and Engineering

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“…Such high concentrations of short-chain carboxylic acids are not atypical of oilfield waters (Kharaka et al, 1973;Willey et al, 1975;Carothers and Kharaka, 1978;Seewald, 2003), and may reflect stepwise oxidation of C 2+ alkanes to carboxylic acids during residence of the hydrocarbon fluids in the deep reservoirs (Shock, 1988; Seewald, 2001b). Considering that temperatures in the lower reservoir exceed 120°C currently, and were likely much higher in the past given that several kilometers of overburden may have eroded since the Permian (Godo et al, 2011), decomposition of C 2+ alkanes at depth may also explain features of the isotopic reversals observed (Burruss and Laughrey, 2010;Tilley et al, 2011;Zumberge et al, 2012;Tilley and Muehlenbachs, 2013). …”

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confidence: 99%

The geochemistry of methane isotopologues

Wang¹

2017

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This thesis documents the origin, distribution, and fate of methane and several of its isotopic forms on Earth. Using observational, experimental, and theoretical approaches, I illustrate how the relative abundances of 12 CH 4 , 13 CH 4 , 12 CH 3 D, and 13 CH 3 D record the formation, transport, and breakdown of methane in selected settings.Chapter 2 reports precise determinations of 13 CH 3 D, a "clumped" isotopologue of methane, in samples collected from various settings representing many of the major sources and reservoirs of methane on Earth. The results show that the information encoded by the abundance of 13 CH 3 D enables differentiation of methane generated by microbial, thermogenic, and abiogenic processes. A strong correlation between clumped-and hydrogen-isotope signatures in microbial methane is identified and quantitatively linked to the availability of H 2 and the reversibility of microbially-mediated methanogenesis in the environment. Determination of 13 CH 3 D in combination with hydrogen-isotope ratios of methane and water provides a sensitive indicator of the extent of C-H bond equilibration, enables fingerprinting of methane-generating mechanisms, and in some cases, supplies direct constraints for locating the waters from which migrated gases were sourced. Chapter 3 applies this concept to constrain the origin of methane in hydrothermal fluids from sediment-poor vent fields hosted in mafic and ultramafic rocks on slow-and ultraslow-spreading mid-ocean ridges. The data support a hypogene model whereby methane forms abiotically within plutonic rocks of the oceanic crust at temperatures above ca. 300• C during respeciation of magmatic volatiles, and is subsequently extracted during active, convective hydrothermal circulation. Chapter 4 presents the results of culture experiments in which methane is oxidized in the presence of O 2 by the bacterium Methylococcus capsulatus strain Bath. The results show that the clumped isotopologue abundances of partially-oxidized methane can be predicted from knowledge of 13 C/ 12 C and D/H isotope fractionation factors alone.: Shuhei Ono, Ph.D. Acknowledgments I fear that this section will not do justice to the people I have not the space to thank individually. Alas, here goes. To those whose names are not specifically listed here, thank you too. I wish first to thank Shuhei Ono. The work this thesis represents could not have happened without his bold vision and the license to explore and question that working in his lab afforded. His unbridled optimism, breadth of scientific curiosity, personal integrity, and accessibility to his personnel are traits I one day hope to emulate. I thank him for his nonjudgmental yet appropriately measured support of many of my ideas-even those that led nowhere-, for believing in me even when I found it difficult to do so myself, and for teaching me to change pump oil, build vacuum lines, and drink Icelandic vodka.I also wish to thank my thesis committee members Jeff Seewald, Roger Summons, and John Pohlman, for their in...

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Isotopic reversal (‘rollover’) in shale gases produced from the Mississippian Barnett and Fayetteville formations

Cited by 282 publications

References 17 publications

Geochemical Characteristics of Shale Gas in Xiasiwan Area, Ordos Basin

Geochemical Characteristics of Shale Gas in Xiasiwan Area, Ordos Basin

The origin and evolution of thermogenic gases in organic-rich marine shales

The geochemistry of methane isotopologues

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