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Advances in Earth Science >

2021 , Vol. 36 >Issue 10: 1004 - 1014

DOI: https://doi.org/10.11867/j.issn.1001-8166.2021.019

Oxidizing Materials Involving in Thermochemical Oxidation of Hydrocarbons in the Lower Triassic Baikouquan Formation， Junggar Basin

  • Xun KANG ,
  • Ruipu HU ,
  • Wenxuan HU ,
  • Jingqiang TAN
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  • 1.School of Geosciences and Info-physics，Central South University，Changsha 410012，China
    2.School of Earth Sciences and Engineering，Nanjing University，Nanjing 210023，China
KANG Xun (1989-), male, Zhoukou City, Henan Province, Lecturer. Research areas include evolution of oil and gas in reservoir rocks and deep burial reservoir beds. E-mail: xunkang@csu.edu.cn

Received date: 2020-10-16

  Revised date: 2021-03-29

  Online published: 2021-11-19

Supported by

the National Natural Science Foundation of China Youth Project "Differences and mechanism of thermochemical oxidation of hydrocarbons in the Lower Triassic clastic reservoir of the Mahu Sag, Junggar Basin"(41902137);The Hunan Natural Science Foundation Youth Project "Reaction sequence and mechanism of thermochemical oxidation of hydrocarbons in deep buried clastic reservoir"(2020JJ5703)

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Abstract

Mechanism of Thermochemical Oxidation of Hydrocarbons （TOH） in the clastic strata of sedimentary basins is unclear.In particular， it is urgently needed to clarify the oxidizing substances involved in the reaction and their state of occurrence before and after the reaction. A related study was carried out in the Lower Triassic Baikouquan （T1b） Formation in Junggar Basin， where the TOH reaction has been confirmed in recent years. Based on detailed core logging， systematic petrological and mineral identification， major elements ofbulk rock and in situ area， and chemical valence analysis of iron ions were carried out. The results show that the cores of this formation show obviously irregular distribution of brown and gray-grayish green layers， and the color changesare not limited in lithologic interface and sedimentary structure. Gray-grayish green layers are most likely the products of bleaching of reducible oil-gas bearing fluid during burial diagenesis. Mineral changes indicate that the color transformation from brown to gray-grayish green is the result of the consumption of oxidizing hematite and the generation of chlorite in the rock. Hematite contains a large amount of Fe3+ and a small amount of Mn3+/4+ ions replacing Fe3+ by isomorphism.In the T1b formation both Fe3+ and Mn3+/4+ in hematite provide effective electron acceptor for the TOH reaction. Mn3+/4+ is preferentially involved in reactions， however，the high content of Fe3+ was the main electron acceptor， followed by low content of Mn3+/4+. The content difference of Fe3+ and Mn3+/4+ causes the fact that the reduction product of authigenic chlorite is rich in Fe， whereas Mn is mainly enriched in low content authigenic calcite cements with extremely negative δ13C values. Abundant hematite participated in the reaction， indicating that the TOH reaction may occur generally in the deep layers of continental petroliferous basins. This reaction will causealterations in mineral composition， remoldingreservoir rocks， and meanwhile consuming large amounts of hydrocarbons in the crust. It is necessary to carry out further studies on this process， particularly in sedimentary basins and subduction zone.

Key words： Thermochemical Oxidation of Hydrocarbons; Oxidants; Hematite; Baikouquan Formation; Junggar Basin.

Cite this article

Xun KANG , Ruipu HU , Wenxuan HU , Jingqiang TAN . Oxidizing Materials Involving in Thermochemical Oxidation of Hydrocarbons in the Lower Triassic Baikouquan Formation， Junggar Basin[J]. Advances in Earth Science, 2021 , 36(10) : 1004 -1014 . DOI: 10.11867/j.issn.1001-8166.2021.019

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