A novel hybrid method for gas hydrate filling modes identification via digital rock

Huaimin Dong, Jianmeng Sun, Muhammad Arif, Naser Golsanami, Weichao Yan, Yihuai Zhang

    Research output: Contribution to journalArticlepeer-review

    48 Scopus citations

    Abstract

    Gas hydrates are one of the most abundant clean energy resources and can effectively solve the energy crisis with a lower carbon footprint. Gas hydrates typically exhibit complex microscopic filling modes, including adhesive mode, cemented mode and scattered mode. Furthermore, the scientific understanding of such filling modes and the associated petrophysical parameters is essential for successful exploitation and development of hydrate formations. However, a precise identification of such filling modes remains a big challenge. Thus, here we proposed a novel hybrid gas hydrate filling mode identification method via digital rock technique. The hybrid method uses a combination of multiple methodologies. Firstly, the dry core samples were scanned by the high-resolution micro-scale 3D X-ray computed tomography (μCT) and the digital rock models were built. Then the resistivity was simulated as a function of gas hydrate saturation with three idealized gas hydrate-filling modes. The differences between the resistivity of three idealized gas hydrate-filling modes were analyzed, and based on the correlations obtained, the idealized gas hydrate saturation calculation models were formulated. We then considered well log data from a real hydrate reservoir in order to evaluate the application of proposed hydrate saturation model and identify the filling mode. Essentially, the gas hydrate saturation results from digital rock models and field well logging data are compared, and the filling modes in the research reservoir were successfully identified.

    Original languageBritish English
    Article number104255
    JournalMarine and Petroleum Geology
    Volume115
    DOIs
    StatePublished - May 2020

    Keywords

    • Filling modes
    • Gas hydrate
    • Gas hydrate saturation
    • Geophysical logs
    • Rock physics
    • Saturation exponent

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