Estimation of critical and maximum gas saturation using multiple 4D seismic surveys

Dennis Chinedu Obidegwu, Colin MacBeth

    Research output: Contribution to conferencePaper

    1 Citation (Scopus)

    Abstract

    Estimates for critical and maximum gas saturation are obtained using time-lapse seismic signatures from multiple surveys shot during gas liberation and dissolution in a producing hydrocarbon reservoir. To aid this process, hydrocarbon gas properties and behaviour are studied, and their relation to the fluid-flow physics is understood using numerical simulation and seismic modelling. It is concluded that for seismic surveys repeated at time intervals of six months or more, the gas saturation distribution during either liberation or dissolution exists in two fixed saturation conditions defined by the critical and the maximum gas saturation. This understanding is then used to interpret seismic data from a turbidite field in the North Sea, which has surveys repeated every 12 to 24 months. We find a critical gas saturation of between 0.6 and 4%, but that the maximum gas saturation is relatively unconstrained. These low critical gas saturation values are consistent with the range of measurements from other similar fields in the open literature.
    Original languageEnglish
    Pages1-5
    Number of pages5
    DOIs
    Publication statusPublished - Jun 2014
    Event76th EAGE Conference and Exhibition 2014 - Amsterdam, Netherlands
    Duration: 16 Jun 201419 Jun 2014

    Conference

    Conference76th EAGE Conference and Exhibition 2014
    CountryNetherlands
    CityAmsterdam
    Period16/06/1419/06/14

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  • Cite this

    Obidegwu, D. C., & MacBeth, C. (2014). Estimation of critical and maximum gas saturation using multiple 4D seismic surveys. 1-5. Paper presented at 76th EAGE Conference and Exhibition 2014, Amsterdam, Netherlands. https://doi.org/10.3997/2214-4609.20140760