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    LA-ICP-MS U–Pb dating of calcite cement in Upper Triassic tight-gas sandstone reservoirs, western Sichuan Basin, SW China

    Access Status
    Fulltext not available
    Authors
    Yu, Y.
    Lin, L.
    Li, Zhen
    Rankenburg, Kai
    Evans, Noreen
    McInnes, Brent
    Date
    2022
    Type
    Journal Article
    
    Metadata
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    Citation
    Yu, Y. and Lin, L. and Li, Z. and Rankenburg, K. and Evans, N.J. and McInnes, B. 2022. LA-ICP-MS U–Pb dating of calcite cement in Upper Triassic tight-gas sandstone reservoirs, western Sichuan Basin, SW China. Terra Nova. 34 (4): pp. 359-368.
    Source Title
    Terra Nova
    DOI
    10.1111/ter.12609
    ISSN
    0954-4879
    Faculty
    Faculty of Science and Engineering
    School
    John de Laeter Centre (JdLC)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE140100150
    URI
    http://hdl.handle.net/20.500.11937/95551
    Collection
    • Curtin Research Publications
    Abstract

    The absolute timing of carbonate cement formations can provide insights into porosity evolution and hydrocarbon accumulation in reservoirs. In this study, scanning electron microscopy-based cathodoluminescence (SEM-CL), quantitative mineralogical analysis and laser ablation inductively coupled plasma-mass spectrometry U–Pb dating were performed on calcite cements from sandstones in the fourth member of the Upper Triassic Xujiahe Formation in the western Sichuan Basin. Two samples yielded U–Pb ages of 149.5 ± 31.1 Ma and 190.0 ± 180.5 Ma (2σ), suggesting late diagenetic precipitation of calcite cements. The backscattered electron and SEM-CL images indicated that the cements precipitated after feldspar dissolution. Combined with palaeo-temperature evolution, these results suggest that the timing of calcite cement precipitation occurred between the Late Jurassic to Early Cretaceous. Rapid accumulation of sediment in the western basin in response to the Yanshanian Orogeny may have caused stratum overpressure, resulting in geofluid activity and calcite precipitation in the Xu4 sandstone.

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