PETROLEUM EXPLORATION

Pyrolysis of coal measure source rocks at highly to over mature stage and its geological implications

  • GAO Jinliang ,
  • NI Yunyan ,
  • LI Wei ,
  • YUAN Yilin
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  • Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Received date: 2019-10-10

  Revised date: 2020-03-10

  Online published: 2020-07-20

Abstract

The influence of water on gas generation from humic type organic matter at highly to over mature stage was investigated with thermal simulation experiments at high temperature and pressure. The result of the experiments indicates that the effect of water on gas generation was controlled by the thermal maturity of organic matter. Water could enhance gas generation and increase hydrocarbon gas yields significantly at over mature stage of humic type organic matter. Hydrogen isotopic compositions of coal-derived gases generated at highly to over mature stage were mainly controlled by thermal maturity of source rocks, but also affected by formation water. Highly and over mature coal measure source rocks are widely distributed in China. The hydrocarbon gas generation capacity of coal measure source rocks and resources potential of coal-derived gases in deep formations would be significantly enhanced assuming that formation water could be involved in the thermal cracking of highly to over mature organic matter in real geological settings.

Cite this article

GAO Jinliang , NI Yunyan , LI Wei , YUAN Yilin . Pyrolysis of coal measure source rocks at highly to over mature stage and its geological implications[J]. Petroleum Exploration and Development, 2020 , 47(4) : 723 -729 . DOI: 10.11698/PED.2020.04.08

References

[1] 戴金星, 倪云燕, 廖凤蓉, 等. 煤成气在产气大国中的重大作用[J]. 石油勘探与开发, 2019, 46(3): 417-432.
DAI Jinxing, NI Yunyan, LIAO Fengrong, et al.The significance of coal-derived gas in major gas producing countries[J]. Petroleum Exploration and Development, 2019, 46(3): 417-432.
[2] 戴金星, 秦胜飞, 胡国艺, 等. 新中国天然气勘探开发70年来的重大进展[J]. 石油勘探与开发, 2019, 46(6): 1037-1046.
DAI Jinxing, QIN Shengfei, HU Guoyi, et al.Major progress in the natural gas exploration and development in the past seven decades in China[J]. Petroleum Exploration and Development, 2019, 46(6): 1037-1046.
[3] 付金华, 魏新善, 罗顺社, 等. 庆阳深层煤成气大气田发现与地质认识[J]. 石油勘探与开发, 2019, 46(6): 1047-1061.
FU Jinhua, WEI Xinshan, LUO Shunshe, et al.Discovery and geological knowledge of large deep coal-formed Qingyang Gas Field, Ordos Basin, NW China[J]. Petroleum Exploration and Development, 2019, 46(6): 1047-1061.
[4] 李剑, 佘源琦, 高阳, 等. 中国陆上深层—超深层天然气勘探领域及潜力[J]. 中国石油勘探, 2019, 24(4): 403-417.
LI Jian, SHE Yuanqi, GAO Yang, et al.Onshore deep and ultra-deep natural gas exploration fields and potentials in China[J]. China Petroleum Exploration, 2019, 24(4): 403-417.
[5] GAO J L, LIU J Q, NI Y Y.Gas generation and its isotope composition during coal pyrolysis: The catalytic effect of nickel and magnetite[J]. Fuel, 2018, 222: 74-82.
[6] SU K H, SHEN J C, CHANG Y J, et al.Generation of hydrocarbon gases and CO2 from a humic coal: Experimental study on the effect of water, minerals and transition metals[J]. Organic Geochemistry, 2006, 37(4): 437-453.
[7] LEWAN M D, KOTARBA M J, WIECLAW D, et al.Evaluating transition-metal catalysis in gas generation from the Permian Kupferschiefer by hydrous pyrolysis[J]. Geochimica et Cosmochimica Acta, 2008, 72(16): 4069-4093.
[8] SEEWALD J S.Organic-inorganic interactions in petroleum producing sedimentary basins[J]. Nature, 2003, 426(6964): 327-333.
[9] PAN C C, GENG A S, ZHONG N N, et al.Kerogen pyrolysis in the presence and absence of water and minerals. 1. Gas components[J]. Energy & Fuels, 2008, 22(1): 416-427.
[10] CHENG P, TIAN H, XIAO X M, et al.Water distribution in overmature organic-rich shales: Implications from water adsorption experiments[J]. Energy & Fuels, 2017, 31(12): 13120-13132.
[11] CHENG P, XIAO X M, TIAN H, et al.Water content and equilibrium saturation and their influencing factors of the lower Paleozoic overmature organic-rich shales in the Upper Yangtze Region of Southern China[J]. Energy & Fuels, 2018, 32(11): 11452-11466.
[12] CHENG P, XIAO X M, WANG X, et al.Evolution of water content in organic-rich shales with increasing maturity and its controlling factors: Implications from a pyrolysis experiment on a water-saturated shale core sample[J]. Marine and Petroleum Geology, 2019, 109: 291-303.
[13] 刘金萍, 耿安松, 卢家烂, 等. 热成熟及水的作用对热解烃同位素组成的影响[J]. 石油实验地质, 2007, 29(2): 199-202, 206.
LIU Jinping, GENG Ansong, LU Jialan, et al.The influences of maturation and water in the isotopic composition of pyrolysis[J]. Petroleum Geology & Experiment, 2007, 29(2): 199-202, 206.
[14] 王永诗, 张守春, 朱日房. 烃源岩生烃耗水机制与油气成藏[J]. 石油勘探与开发, 2013, 40(2): 242-249.
WANG Yongshi, ZHANG Shouchun, ZHU Rifang.Water consumption in hydrocarbon generation and its significance to reservoir formation[J]. Petroleum Exploration and Development, 2013, 40(2): 242-249.
[15] WANG X F, LIU W H, XU Y C, et al.Pyrolytic simulation experiments on the role of water in natural gas generation from coal[J]. International Journal of Coal Geology, 2008, 75(2): 105-112.
[16] LEWAN M D, ROY S.Role of water in hydrocarbon generation from Type-I kerogen in Mahogany oil shale of the Green River Formation[J]. Organic Geochemistry, 2011, 42(1): 31-41.
[17] LEWAN M D.Experiments on the role of water in petroleum formation[J]. Geochimica et Cosmochimica Acta, 1997, 61(17): 3691-3723.
[18] BEHAR F, LEWAN M D, LORANT F, et al.Comparison of artificial maturation of lignite in hydrous and nonhydrous conditions[J]. Organic Geochemistry, 2003, 34(4): 575-600.
[19] 孙丽娜, 张明峰, 吴陈君, 等. 水对不同生烃模拟实验系统产物的影响[J]. 天然气地球科学, 2015, 26(3): 524-532.
SUN Lina, ZHANG Mingfeng, WU Chenjun, et al.The effect of water medium on the products of different pyrolysis system[J]. Natural Gas Geoscience, 2015, 26(3): 524-532.
[20] 王晓锋, 刘文汇, 徐永昌, 等. 水介质对气态烃形成演化过程氢同位素组成的影响[J]. 中国科学: 地球科学, 2012, 42(1): 103-110.
WANG Xiaofeng, LIU Wenhui, XU Yongchang, et al.Influences of water media on the hydrogen isotopic composition of natural gas/methane in the processes of gaseous hydrocarbon generation and evolution[J]. SCIENCE CHINA Earth Science, 2011, 54(9): 1318-1325.
[21] 帅燕华, 张水昌, 罗攀, 等. 地层水促进原油裂解成气的模拟实验证据[J]. 科学通报, 2012, 57(30): 2857-2863.
SHUAI Yanhua, ZHANG Shuichang, LUO Pan, et al.Experimental evidence for formation water promoting crude oil cracking to gas[J]. Chinese Science Bulletin, 2012, 57(30): 2857-2863.
[22] 王晓锋, 刘文汇, 徐永昌, 等. 水在有机质形成气态烃演化中作用的热模拟实验研究[J]. 自然科学进展, 2006(10): 1275-1281.
WANG Xiaofeng, LIU Wenhui, XU Yongchang, et al.Role of water in hydrocarbon gas generation from organic matters: Evidence from pyrolysis experiments[J]. Progress in Natural Science, 2006(10): 1275-1281.
[23] ZHANG S C, MI J K, HE K.Synthesis of hydrocarbon gases from four different carbon sources and hydrogen gas using a gold-tube system by Fischer-Tropsch method[J]. Chemical Geology, 2013, 349: 27-35.
[24] NI Y Y, GAO J L, CHEN J P, et al.Gas generation and its isotope composition during coal pyrolysis: Potential mechanism of isotope rollover[J]. Fuel, 2018, 231: 387-395.
[25] ZHANG J L, WENG X X, HAN Y, et al.The effect of supercritical water on coal pyrolysis and hydrogen production: A combined ReaxFF and DFT study[J]. Fuel, 2013, 108: 682-690.
[26] STALKER L, FARRIMOND P, LARTER S R.Water as an oxygen source for the production of oxygenated compounds (including CO2 precursors) during kerogen maturation[J]. Organic Geochemistry, 1994, 22(3): 477-486.
[27] SEEWALD J S, BENITEZ-NELSON B C, WHELAN J K. Laboratory and theoretical constraints on the generation and composition of natural gas[J]. Geochimica et Cosmochimica Acta, 1998, 62(9): 1599-1617.
[28] SCHOELL M.The hydrogen and carbon isotopic composition of methane from natural gases of various origins[J]. Geochimica et Cosmochimica Acta, 1980, 44(5): 649-661.
[29] NI Y Y, MA Q S, ELLIS G S, et al.Fundamental studies on kinetic isotope effect (KIE) of hydrogen isotope fractionation in natural gas systems[J]. Geochimica et Cosmochimica Acta, 2011, 75(10): 2696-2707.
[30] NI Y Y, LIAO F R, GAO J L, et al.Hydrogen isotopes of hydrocarbon gases from different organic facies of the Zhongbai gas field, Sichuan Basin, China[J]. Journal of Petroleum Science Engineering, 2019, 179: 776-786.
[31] SCHIMMELMANN A, SESSIONS A L, MASTALERZ M.Hydrogen isotopic (D/H) composition of organic matter during diagenesis and thermal maturation[J]. Annual Review of Earth and Planetary Sciences, 2006, 34: 501-533.
[32] SCHIMMELMANN A, LEWAN M D, WINTSCH R P.D/H isotope ratios of kerogen, bitumen, oil, and water in hydrous pyrolysis of source rocks containing kerogen types I, II, IIS, and III[J]. Geochimica et Cosmochimica Acta, 1999, 63(22): 3751-3766.
[33] REEVES E P, SEEWALD J S, SYLVA S P.Hydrogen isotope exchange between n-alkanes and water under hydrothermal conditions[J]. Geochimica et Cosmochimica Acta, 2012, 77: 582-599.
[34] ZENG H S, LI J K, HUO Q L.A review of alkane gas geochemistry in the Xujiaweizi fault-depression, Songliao Basin[J]. Marine and Petroleum Geology, 2013, 43: 284-296.
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