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九佛堂组砂岩储层为水下扇沉积，研究区内可见中扇和外扇。水下扇经历了发育、成熟和衰亡三个阶段，分别对应于Ⅲ、Ⅱ、Ⅰ三个砂组，相当于外扇、中扇外缘叶状体和中扇内缘沟道相。储层孔隙度变化不大，但渗透率变化剧烈，反映砂体强烈的非均质性。根据毛管压力特征，可分出中孔中渗型、中孔低渗型和低孔特低渗型三类储层。
The Jiufotang Formation sandstone reservoir is a submarine fan, with medium and outer fans visible in the study area. Underwater fan experienced three stages of development, maturation and decline, which correspond to the three sand groups Ⅲ, Ⅱ and Ⅰ, respectively, which is equivalent to the outer fan, the middle fan outer frond and the mid-fan inner channel. The reservoir porosity changes little, but the permeability changes drastically, which reflects the intense heterogeneity of the sand body. According to the capillary pressure characteristics, three types of reservoirs can be distinguished: mesopore medium permeability, mesoporous low permeability and low porosity ultra-low permeability.