黄苏卫,刘峰,戚家振. 西湖凹陷Y构造花港组致密砂岩成藏特征[J]. 海洋地质前沿,2023,39(3):71-80. DOI: 10.16028/j.1009-2722.2022.045
    引用本文: 黄苏卫,刘峰,戚家振. 西湖凹陷Y构造花港组致密砂岩成藏特征[J]. 海洋地质前沿,2023,39(3):71-80. DOI: 10.16028/j.1009-2722.2022.045
    HUANG Suwei, LIU Feng, QI Jiazhen. Tight sandstone accumulation characteristics of Huagang Formation in Y Structure of Xihu Sag[J]. Marine Geology Frontiers, 2023, 39(3): 71-80. DOI: 10.16028/j.1009-2722.2022.045
    Citation: HUANG Suwei, LIU Feng, QI Jiazhen. Tight sandstone accumulation characteristics of Huagang Formation in Y Structure of Xihu Sag[J]. Marine Geology Frontiers, 2023, 39(3): 71-80. DOI: 10.16028/j.1009-2722.2022.045

    西湖凹陷Y构造花港组致密砂岩成藏特征

    Tight sandstone accumulation characteristics of Huagang Formation in Y Structure of Xihu Sag

    • 摘要: 致密砂岩相对优质储层发育控制因素及其成藏特征是制约西湖凹陷深层勘探的关键问题。三潭深凹Y构造花港组是致密砂岩重要勘探领域。利用岩石薄片鉴定、扫描电镜、压汞实验等测试手段,从沉积环境相带、成岩矿物作用、构造幅度与储层有效充注和富集程度等方面,对Y构造致密砂岩储层发育特征、成藏过程及其控制因素开展研究。研究结果表明,研究区致密砂岩储层分为4类,其中,Ⅰ类储层是相对优质储层,是油气优先充注的优质通道。高能沉积环境中粗粒沉积是相对优质储层形成的前提,孔隙衬垫绿泥石利于原生粒间孔隙保存,并且促进晚期溶蚀,是物性改善的关键。Y构造致密砂岩发育叠覆跨越成藏组合,相对优质储层和构造幅度共同控制储层含气性,构造幅度增加,在相对较差储层(Ⅱ类和Ⅲ类)中同样发育气层。该研究对西湖凹陷致密砂岩气富集区的寻找及优选具有重要的指导意义。

       

      Abstract: The controlling factors and accumulation characteristics of relatively high-quality tight sandstone reservoir have become the most important factors limiting the deep exploration in the Xihu Sag on shelf of the East China Sea. Thin section analysis, scanning electron microscopy, and mercury injection test were conducted based on gas bearing property, from which the characteristics and gas accumulation process of tight sandstone reservoir were clarified. Results show that the tight sandstone reservoirs could be divided into four types, among which the type Ⅰ reservoir is relatively high quality reservoir with a high quality channel for gas charging. Coarse-grained deposition in high-energy sedimentary environment is the prerequisite for the formation of the relatively high-quality reservoirs. Authigenic chlorite pore liner is the key to the improvement of physical properties, which is beneficial to the preservation of primary intergranular pores and the promotion to late dissolution. The gas bearing property of the reservoir is co-controlled by the relatively high quality reservoir and the structural amplitude. The gas layer is also developed in the relatively poor reservoir (type Ⅱ and Ⅲ) along with the increase of structural amplitude. This study has important significance for the exploration of tight sandstone gas in the Xihu Sag.

       

    /

    返回文章
    返回