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    Pore-Throat Structure in the Chang 7 Subformation Influencing the Differential Accumulation of Tight Sandstone Oil: Insight from SEM, Rate-Controlled Mercury, and High-Pressure Mercury Results

    Source: Journal of Energy Engineering:;2023:;Volume ( 149 ):;issue: 005::page 04023036-1
    Author:
    Feisheng Mou
    ,
    Xiangdong Yin
    ,
    Shijia Chen
    ,
    Cong Hu
    ,
    Haifeng Zhang
    ,
    Xin He
    ,
    Linfeng Dai
    ,
    Yifan Lu
    ,
    Meimei Han
    DOI: 10.1061/JLEED9.EYENG-4913
    Publisher: ASCE
    Abstract: The complicated pore-throat structure of unconventional resource formations such as tight sandstones influences petroleum accumulation and even exploitation, because the pore-throat structure is difficult to mark. A pore-throat system was distinguished quantitatively utilizing high-pressure mercury (HPM), scanning electron microscopy (SEM), casting film, and rate-controlled mercury (RCM) methods. According to the analysis of the reservoir, the factors of differential accumulation of tight oil in Longdong and Northern Shaanxi were assessed. The results showed that lamellar throats and tube bundle throats were the primary types of throats in the study area. Tight sandstones from Longdong have a higher content of large throats than those from Northern Shaanxi, both with pore radii of 100–200 μm, whereas Northern Shaanxi has better pore-throat connectivity and better homogeneity of pores and throats. The fractal dimension of fine pores (D2) is significantly correlated with the pore-throat structure, including the median pressure and mercury saturation of macropore throats. Therefore, the pore-throat structure can be characterized by the fractal dimensions of small pores and throats. The continuous distribution of tight oil in Northern Shaanxi, with a higher degree of tight oil than Longdong, is positively related to the good pore-throat connectivity of the reservoir and the relatively small fractal dimension of the small throat. Thus, the differential accumulation of tight oil was influenced by the pore-throat connectivity and heterogeneity of the reservoir structure. The results of this study can be helpful in evaluating reservoir characteristics and selecting exploration zones.
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      Pore-Throat Structure in the Chang 7 Subformation Influencing the Differential Accumulation of Tight Sandstone Oil: Insight from SEM, Rate-Controlled Mercury, and High-Pressure Mercury Results

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4293718
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    • Journal of Energy Engineering

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    contributor authorFeisheng Mou
    contributor authorXiangdong Yin
    contributor authorShijia Chen
    contributor authorCong Hu
    contributor authorHaifeng Zhang
    contributor authorXin He
    contributor authorLinfeng Dai
    contributor authorYifan Lu
    contributor authorMeimei Han
    date accessioned2023-11-27T23:37:23Z
    date available2023-11-27T23:37:23Z
    date issued7/31/2023 12:00:00 AM
    date issued2023-07-31
    identifier otherJLEED9.EYENG-4913.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4293718
    description abstractThe complicated pore-throat structure of unconventional resource formations such as tight sandstones influences petroleum accumulation and even exploitation, because the pore-throat structure is difficult to mark. A pore-throat system was distinguished quantitatively utilizing high-pressure mercury (HPM), scanning electron microscopy (SEM), casting film, and rate-controlled mercury (RCM) methods. According to the analysis of the reservoir, the factors of differential accumulation of tight oil in Longdong and Northern Shaanxi were assessed. The results showed that lamellar throats and tube bundle throats were the primary types of throats in the study area. Tight sandstones from Longdong have a higher content of large throats than those from Northern Shaanxi, both with pore radii of 100–200 μm, whereas Northern Shaanxi has better pore-throat connectivity and better homogeneity of pores and throats. The fractal dimension of fine pores (D2) is significantly correlated with the pore-throat structure, including the median pressure and mercury saturation of macropore throats. Therefore, the pore-throat structure can be characterized by the fractal dimensions of small pores and throats. The continuous distribution of tight oil in Northern Shaanxi, with a higher degree of tight oil than Longdong, is positively related to the good pore-throat connectivity of the reservoir and the relatively small fractal dimension of the small throat. Thus, the differential accumulation of tight oil was influenced by the pore-throat connectivity and heterogeneity of the reservoir structure. The results of this study can be helpful in evaluating reservoir characteristics and selecting exploration zones.
    publisherASCE
    titlePore-Throat Structure in the Chang 7 Subformation Influencing the Differential Accumulation of Tight Sandstone Oil: Insight from SEM, Rate-Controlled Mercury, and High-Pressure Mercury Results
    typeJournal Article
    journal volume149
    journal issue5
    journal titleJournal of Energy Engineering
    identifier doi10.1061/JLEED9.EYENG-4913
    journal fristpage04023036-1
    journal lastpage04023036-18
    page18
    treeJournal of Energy Engineering:;2023:;Volume ( 149 ):;issue: 005
    contenttypeFulltext
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