Microscopic image data set of Xujiahe gas reservoir in northeast Sichuan

Xujiahe Formation gas reservoir in northeast Sichuan Basin has good exploration and development potential. In this paper, the microscopic image data of the clastic reservoir of xujiahe Formation gas reservoir in the study area are collected and sorted, and the petrological characteristics, diagenesis, reservoir space and physical properties of xujiahe Formation reservoir are further studied. The reservoir rocks are lithic sandstone, lithic arkose sandstone and quartz sandstone. There are intergranular solution pores, residual intergranular solution pores, intragranular solution pores, clay mineral intergranular (solution) pores and various microfractures in the reservoir space. Through the observation of the cast thin section, the pores are relatively undeveloped, and some thin sections (micro-cracks) are relatively developed. Through thin section identification and observation, the sandstone reservoirs of Xujiahe Formation in the study area have undergone compaction, cementation, dissolution and tectonic fracture. The establishment of this data set can provide a direct way for the comparative analysis and reference of sandstone image data, and can also be used as a standard for the intelligent identification of lithology.

位于四川盆地东北部的徐家河组气藏具有良好的勘探开发潜力。本文收集并整理了研究区域内徐家河组气藏碎屑岩的微观图像数据，对徐家河组储层岩石的岩石学特征、成岩作用、储集空间及物理性质进行了深入研究。储层岩石主要为岩屑砂岩、岩屑长石砂岩和石英砂岩。储集空间内存在颗粒间溶蚀孔、残余颗粒间溶蚀孔、颗粒内溶蚀孔、粘土矿物颗粒间（溶蚀）孔以及多种微裂缝。通过对铸体薄片进行观察，发现孔隙相对不发育，部分薄片（微裂缝）相对发育。通过对薄片的鉴定和观察，研究区域内徐家河组砂岩储层经历了压缩、胶结、溶蚀和构造裂缝作用。本数据集的建立可为砂岩图像数据的对比分析和参考提供直接途径，亦可用于岩性的智能识别标准。