Abstract
A set of thick, black organic shale is developed at the bottom of the Chang 7 accumulation, an important oil-producing section of the Triassic Yanchang Formation in Ordos Basin. In this paper, the thermogravimetric (TG) behaviour of different organic-rich shale layers is studied in an argon environment. Changes in activation energy (E) are analysed by the Coats-Redfern kinetic method, and thermodynamic characteristics at different temperature stages are clarified. The TG curve of Chang 7 shale decreases between 400 and 650°C, which is the main temperature range of organic matter pyrolysis. Meanwhile, the pyrolysis rate reaches a maximum at about 500°C. In the low-temperature stage, E is low and increases with the temperature. At a temperature of about 650°C and conversion rate of about 0.8, the E reaches a maximum. The organic carbon content in layers Y4 and Y5 are higher, while the E is relatively low.
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References
Al-Ayed OS, Matouq R, Anbar R, Khaleel RM, Abu-Nameh R (2010) Oil shale pyrolysis kinetics and variable activation energy principle. Appl Energy 87(4):1269–1272. https://doi.org/10.1016/j.apenergy.2009.06.020
Al-Harahsheh M, Al-Ayed O, Robinson J, Kingman S, Al-Harahsheh A, Tarawneh K, Saeid A, Barranco R (2011) Effect of demineralization and heating rate on the pyrolysis kinetics of Jordanian oil shales. Fuel Process Technol 92(9):1805–1811. https://doi.org/10.1016/j.fuproc.2011.04.037
Campbell JH, Gallegos G, Gregg M (1980) Gas evolution during oil shale pyrolysis. 2. Kinetic and stoichiometric analysis. Fuel 59(10):727–732. https://doi.org/10.1016/0016-2361(80)90028-9
Chen Q, Li W, Hao S, Liu Z, Xu J (2011) Carbon isotope evidence for Ordovician marine hydrocarbon source rocks in Ordos Basin, North China. Energy Explor Exploit 29(3):267–289. https://doi.org/10.1260/0144-5987.29.3.267
Coats AW, Redfern JP (1964) Kinetic parameters from thermogravimetric data. Nature 201(4914):68–69. https://doi.org/10.1038/201068a0
Cui J, Zhu R, Li S, Qi Y, Shi X, Mao Z (2019) Development patterns of source rocks in the depression lake basin and its influence on oil accumulation: case study of the Chang 7 member of the Triassic Yanchang Formation, Ordos Basin, China. J NaturalGas Geosci 4(4):191–204. https://doi.org/10.1016/j.jnggs.2019.08.002
Fan B, Shi L, Li Y, Zhang T, Lv L, Shikai T (2019) Lithologic heterogeneity of lacustrine shale and its geological significance for shale hydrocarbon-a case study of Zhangjiatan Shale. Open Geosci 11(1):101–112. https://doi.org/10.1515/geo-2019-0009
Flynn JH, Wall LA (1966) General treatment of the thermogravimetry of polymers. J Res Natl Bur Stand 70A(6):487–523. https://doi.org/10.6028/jres.070A.043
Friedman HL (1965) Pyrolysis of plastics in a high vacuum arc image furnace II. J ApplPolym Sci 9(3):1005–1018. https://doi.org/10.1002/app.1965.070090318
Kissinger HE (1956) Variation of peak temperature with heating rate in differential thermal analysis. J Res Natl Bur Stand 57(4):217–221. https://doi.org/10.6028/jres.057.026
Kissinger HE (1957) Reaction kinetics in differential thermal analysis. Anal Chem 29(11):1702–1706. https://doi.org/10.1021/ac60131a045
Kök MV (2001) Thermal investigation of Seyitomer oil shale. Thermochim Acta 369(1):149–155. https://doi.org/10.1016/S0040-6031(00)00764-4
Kök MV, Pamir MR (2000) Comparative pyrolysis and combustion kinetics of oil shales. J Anal Appl Pyrolysis 55(2):185–194. https://doi.org/10.1016/S0165-2370(99)00096-0
Lei Y, Luo X, Wang X, Zhang L, Jiang C, Yang W, Yu Y, Cheng M, Zhang L (2015) Characteristics of silty laminae in Zhangjiatan Shale of southeastern Ordos Basin, China: implications for shale gas formation. AAPG Bull 99(4):661–687. https://doi.org/10.1306/09301414059
Li YC, Wu D, Han G, Liu J (2014) Pyrolysis characteristic and production analysis of Fushun oil shale. J Liaoning Tech U (Natural Science) 33(12):1613–1616 (in Chinese)
Li DL, Li RX, Zhu ZW, Wu XL, Cheng JH, Liu FT, Zhao BS (2017) Origin of organic matter and paleo-sedimentary environment reconstruction of the Triassic oil shale in Tongchuan city, southern Ordos Basin (China). Fuel 208(15):223–235. https://doi.org/10.1016/j.fuel.2017.07.008
Li DL, Li RX, Tan CQ, Zhao D, Liu FT, Zhao BS (2019) Depositional conditions and modeling of Triassic oil shale in southern Ordos basin using geochemical records. J CentSouth Univ 26:3436–3456. https://doi.org/10.1007/s11771-019-4265-6
Li DL, Shi QM, Mi NZ, Xu Y, Wang XK, Tao WX (2020) The type, origin and preservation of organic matter of the fine-grain sediments in Triassic Yanhe Profile, Ordos Basin, and their relation to paleoenvironment condition. J Pet Sci Eng 188:106875. https://doi.org/10.1016/j.petrol.2019.106875
Lv QQ, Luo SS, Fu JH, Niu XB, Xu LM, Feng SB, Li SX (2018) Detailed study of lake fine grained deposition characteristics: a case study from Chang 7 of Yanhe section, Ordos Basin. Geosci 32(2):364–373 (in Chinese)
Mahanta B, Ranjith PG, Vishal V, Singh TN (2020) Temperature-induced deformational responses and microstructural alteration of sandstone. J Pet Sci Eng 192:107239. https://doi.org/10.1016/j.petrol.2020.107239
Ozawa T (1970) Kinetic analysis of derivative curves in thermal analysis. J Thermal Anal Calorim 2(3):301–324. https://doi.org/10.1016/j.petrol.2020.107239
Qin XY, Wang ZL, Yu HY, Chen H, Lei YH, Luo XR, Zhang LX, Jiang CF, Gao C (2016) Geophysical well logging in brittleness evaluation based on rock mechanics characteristic—a case study from the member 7 shale of Yanchang Formation in southeast Ordos Basin. Prog Geophys 31(2):762–769 (in Chinese)
Ren ZL, Li WH, Liang Y, Wu XQ, Yu Q, Ren L, Wang W (2014) Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin. Oil Gas Geology 35:190–198. (in Chinese). https://doi.org/10.11743/ogg20140203
Sadhukhan AK, Gupta P, Goyal T, Saha RK (2008) Modelling of pyrolysis of coal–biomass blends using thermogravimetric analysis. Bioresour Technol 99(17):8022–8026. https://doi.org/10.1016/j.biortech.2008.03.047
Thakur DS, HEN J (1987) Kinetics of pyrolysis of Moroccan oil shale by thermogravimetry. Ind Eng Chem Res 26(26):1351–1356. https://doi.org/10.1021/ie00067a015
Vyazovkina S, Burnhamb AK, Favergeonc L, Kogad N, Moukhinae E, Pérez-Maquedaf LA, Sbirrazzuolig N (2020) ICTAC Kinetics Committee recommendations for analysis of multi-step kinetics. Thermochim Acta 689:178597. https://doi.org/10.1016/j.tca.2020.178597t
Wang Q, Yan YH, Jia CX, Zhu YC (2014) FT-IR analysis and pyrolysis characteristics of oil shale from Gansu province. Chem Ind Eng Prog 33(7):1730–1734 (in Chinese)
Williams PT, Ahmad N (2000) Investigation of oil-shale pyrolysis processing conditions using thermogravimetric analysis. Appl Energy 66(2):113–133. https://doi.org/10.1016/S0306-2619(99)00038-0
Yang Y, Li W, Ma L (2005) Tectonic and stratigraphic controls of hydrocarbon systems in the Ordos basin: a multicycle cratonic basin in central China. AAPG Bull 89(2):255–269. https://doi.org/10.1306/10070404027
Yang H, Niu XB, Xu LM, Feng SB, You Y, Liang XW, Wang F, Zhang DD (2016) Exploration potential of shale oil in Chang7 member, Upper Triassic Yanchang Formation, Ordos Basin, NW China. Pet Explor Dev 43(4):560–569. https://doi.org/10.1016/S1876-3804(16)30066-0
Yu YX, Luo XR, Lei YH, Wang XZ, Zhang LX, Jiang CF, Yang W, Cheng M, Zhang LK (2016) Characterization of lacustrine shale pore structure: the Upper-Triassic Yanchang Formation, Ordos Basin, China. Nat Gas Geosci 1(4):299–308. https://doi.org/10.1016/j.jnggs.2016.10.001
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This research was supported by the National Natural Science Foundation of China (Grant No. 41972288, 41902174), the Basic Research Program of Natural Science of Shaanxi Province (Grant No. 2020JQ-744) and the Natural Science Basic Research Program of Shaanxi (Grant No. 2019JM-409).
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Responsible Editor: Zeynal Abiddin Erguler
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Ge, Z., Sun, Q., Li, D. et al. Pyrolysis characteristics of organic-rich shale from the Chang 7 member of Triassic Yanhe Profile in Ordos Basin. Arab J Geosci 14, 1024 (2021). https://doi.org/10.1007/s12517-021-07382-y
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DOI: https://doi.org/10.1007/s12517-021-07382-y