Chemical and isotopic composition of gases released by crush methods from organic rich mudrocks

Zhang, Tongwei; Yang, Rongsheng; Milliken, Kitty L.; Ruppel, Stephen C.; Pottorf, Robert J.; Sun, Xun

doi:10.1016/j.orggeochem.2014.05.003

Cited by 55 publications

(26 citation statements)

References 55 publications

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“…The δ 13 C 1 and δ 13 C CO2 values of the crushed gas of the Changning Longmaxi Shale show thermal cracking features similar to the produced gas of the Barnett Shale (Rodriguez and Philp, 2010;Zhang et al, 2014) (Figure 5b). Variation in the carbon isotopes of methane and ethane with C 1 ∕ðC 2 þ C 3 Þ ratios is consistent with those of produced shale gas (Dai et al, 2014; Figure 6).…”

Section: Carbon Isotopic Composition Of Released Gases By Rock Crushingmentioning

confidence: 84%

“…after hydraulic fracturing, indicating that organic-rich shale preferentially retains CO 2 . The organic-rich Barnett Shale also shows similar gas compositional differences between crushed gas and produced gas (Rodriguez and Philp, 2010;Zhang et al, 2014).…”

Section: Origins Of Nonhydrocarbon Gasesmentioning

confidence: 85%

“…The crushed gases show significantly lower C 1 ∕CO 2 ratios (0.19-3.81; average 1.14) for all samples than the C 1 ∕CO 2 ratios of produced gas (108.3-247.6, average 177.9), and have similar C 1 ∕ðC 2 þ C 3 Þ ratios (12.2-312.4, average 291.7) compared to those of the produced gas (183.4-281.5, average 219.76) (Dai et al, 2014). The crushed gas and produced gas of the Longmaxi Shale have similar C 1 ∕CO 2 ratios to those of Barnett Shale (Rodriguez and Philp, 2010;Zhang et al, 2014), but the crushed gas of the Longmaxi Shale show greater C 1 ∕ðC 2 þ C 3 Þ ratios than those of the Barnett Shale ( Figure 4).…”

Section: Chemical Compositions Of Gases Released From Longmaxi Shalesmentioning

confidence: 90%

“…Vacuum rock crushing is a recently improved and effective extraction method for gases trapped in rocks (Aziz and Ming-Li, 1999;Smith and Spanel, 2005;Zhang et al, 2009Zhang et al, , 2014. Chemical and isotopic compositions of the crushed gas released by ball-mill rock crushing from a series of Barnett Shales of different thermal maturities have been used as an indication of gas-thermal maturity .…”

Section: Introductionmentioning

confidence: 99%

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The molecular and carbon isotopic constrains on origin and storage of Longmaxi Formation shale gas in Changning area, Sichuan Basin, China

et al. 2015

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We have developed a vacuum-crushing method for the extraction of gases stored in shale for the determination of gas yield, chemical composition, and carbon isotopic composition by online gas-chromatography and mass spectrometry. Analysis of the evacuation and parallel experiments showed low standard deviation and good reproducibility. This approach significantly improved the detection limits for trace-gas analysis in shale and measured multiple nonhydrocarbon gas components in a single run. We analyzed the chemical and carbon isotopic compositions of the gases released by one-step vacuum crushing from nineteen samples of organic-rich Longmaxi Formation (Fm.) shale in Changning outcrop, Sichuan Basin, China, and we studied the main controls on gas chemistry of retained gas in the Longmaxi Shale. The results showed that the crushed gas is high in N 2 and CO 2 but low in CH 4 . The crushed gas has obviously lower C 1 ∕CO 2 ratios than the gas produced from the Longmaxi Fm. after hydraulic fracturing; it was dominated by CH 4 -dry gas while it is normalized to 100% total gaseous hydrocarbons and similar in chemical composition to hydrocarbon gases in the produced gas. Yields of CH 4 , CO 2 , and H 2 in the crushed gas of most samples showed a weak positive correlation with total organic carbon (TOC) contents. The crushed gas had significantly light δ 13 C 1 (on average −35.8%) values and similar δ 13 C 2 values when compared with the produced gas in the Changning area. The δ 13 C values of C 1 , C 2 , C 3 , and CO 2 have similar features to the produced gas from the Weiyuan shale-gas play. Isotopically reversed trends (δ 13 C 1 > δ 13 C 2 ) between ethane and methane were observed for some samples. Our findings regarding the similarity in chemical and carbon isotopic compositions between crushed gas and produced gas from the Weiyuan shale-gas play might provide important evidence of the origin and storage of shale gas in the organic-rich Silurian Longmaxi Fm.

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Section: Carbon Isotopic Composition Of Released Gases By Rock Crushingmentioning

confidence: 84%

Section: Origins Of Nonhydrocarbon Gasesmentioning

confidence: 85%

Section: Chemical Compositions Of Gases Released From Longmaxi Shalesmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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The molecular and carbon isotopic constrains on origin and storage of Longmaxi Formation shale gas in Changning area, Sichuan Basin, China

et al. 2015

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“…Zhang et al (2014) studied gas geochemical characteristics of the residual gas from Barnett shales. The chemical and carbon isotopic compositions of crushed-rock gases from organic-rich Barnett shale core samples with a wide range of thermal maturities (0.58e2.07%R o ) were analyzed and compared to previously reported the chemical and isotopic compositions of produced gas from Barnett Shale, providing information of great relevance for understanding deep shale gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary and residual gas geochemical characteristics of the Lower Cambrian organic-rich shales in Southeastern Chongqing, China

Tuo

Zhang

et al. 2016

Marine and Petroleum Geology

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Carbon isotope fractionation during shale gas transport: Mechanism, characterization and significance

et al. 2020

Sci. China Earth Sci.

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Chemical and isotopic composition of gases released by crush methods from organic rich mudrocks

Cited by 55 publications

References 55 publications

The molecular and carbon isotopic constrains on origin and storage of Longmaxi Formation shale gas in Changning area, Sichuan Basin, China

The molecular and carbon isotopic constrains on origin and storage of Longmaxi Formation shale gas in Changning area, Sichuan Basin, China

Sedimentary and residual gas geochemical characteristics of the Lower Cambrian organic-rich shales in Southeastern Chongqing, China

Carbon isotope fractionation during shale gas transport: Mechanism, characterization and significance

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