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Dual Effect of Hydrothermal Fluid on Shale Oil Reservoir in Gulong Sag, Songliao Basin: Constrained by C-O Isotope and Geochemistry

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  • Junhui Li

    (Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
    National Key Laboratory of Green Exploitation of Continental Shale Oil with Multi-Resource Collaboration, Daqing 163002, China)

  • Xiuli Fu

    (Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
    National Key Laboratory of Green Exploitation of Continental Shale Oil with Multi-Resource Collaboration, Daqing 163002, China)

  • Yue Bai

    (Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
    National Key Laboratory of Green Exploitation of Continental Shale Oil with Multi-Resource Collaboration, Daqing 163002, China)

  • Haixin Zhang

    (National Key Laboratory of Green Exploitation of Continental Shale Oil with Multi-Resource Collaboration, Daqing 163002, China
    Geoscience College, Northeast Petroleum University, Daqing 163318, China)

  • Zongbao Liu

    (National Key Laboratory of Green Exploitation of Continental Shale Oil with Multi-Resource Collaboration, Daqing 163002, China
    Geoscience College, Northeast Petroleum University, Daqing 163318, China)

  • Rongsheng Zhao

    (College of Earth Sciences, Jilin University, Changchun 130061, China)

Abstract

Hydrothermal activity is widespread in sedimentary basins, but its dual effects (chemistry and temperature) on shale reservoirs are rarely discussed. In this research, we systematically collected 33 well core samples from Q 1 to Q 9 units in Gulong Sag, Songliao Basin, and analyzed them using a variety of analytical techniques, including a field emission scanning electron microscopy (FE-SEM), an energy-dispersive spectrometer (EDS), X-ray diffraction (XRD), and stable C-O isotopes. Combined with the collected vitrinite reflectance (Ro), total organic carbon (TOC), and soluble hydrocarbon content data, which is the sum of free oil (pyrolysis S 1 ) and sorb oil content (pyrolysis S 2 ), the results show that (1) Q 4 and Q 8 units have large amounts of hydrothermal minerals, and its C-O isotope obviously shifts to negative, which implied those units are the main hydrothermal fluid influence area; (2) the hydrothermal activity occurred in the late depositional period of Q 1 –Q 9 units such that its geochemistry has little effect on the proliferation of algae blooms, but its high temperature calculated by δ 18 O temperature formulas (around 208 °C) promoted the organic matter maturation process around Q 4 and Q 8 ; and (3) the overpressure caused by hydrothermal activity protected the shale reservoir and minimized the decrease in mineral reservoir brittleness index caused by hydrothermal fluid influence. We suggest that the shale reservoir affected by hydrothermal fluid will become a good geology “dessert”, and its upper and/or lower bounds can form an engineering “dessert” due to the precipitation of large amounts of brittle carbonate minerals.

Suggested Citation

  • Junhui Li & Xiuli Fu & Yue Bai & Haixin Zhang & Zongbao Liu & Rongsheng Zhao, 2024. "Dual Effect of Hydrothermal Fluid on Shale Oil Reservoir in Gulong Sag, Songliao Basin: Constrained by C-O Isotope and Geochemistry," Energies, MDPI, vol. 17(16), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:16:p:4159-:d:1460728
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    References listed on IDEAS

    as
    1. Rongsheng Zhao & Luquan Ren & Sunhua Deng & Youhong Sun & Zhiyong Chang, 2021. "Constrain on Oil Recovery Stage during Oil Shale Subcritical Water Extraction Process Based on Carbon Isotope Fractionation Character," Energies, MDPI, vol. 14(23), pages 1-12, November.
    2. D. T. Johnston & F. A. Macdonald & B. C. Gill & P. F. Hoffman & D. P. Schrag, 2012. "Uncovering the Neoproterozoic carbon cycle," Nature, Nature, vol. 483(7389), pages 320-323, March.
    3. Alessandro Tagliabue & Andrew R. Bowie & Philip W. Boyd & Kristen N. Buck & Kenneth S. Johnson & Mak A. Saito, 2017. "The integral role of iron in ocean biogeochemistry," Nature, Nature, vol. 543(7643), pages 51-59, March.
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