A demonstration area was established on the north slope of the Mahu Depression, Junggar Basin, NW China to carry out the hydrofracturing experiment and a cored well was designed to investigate hydraulic fractures. 345 fractures, comprising HFs, natural fractures, core-handling fractures, and drilling-induced fractures, were harvested from four continuous cores of about 323.19 m that contained mudstone, sandstone, and conglomerate. The lithology of the core is dominated by the conglomerate, which is characterized by coarse gravel size, poor sorting, and gravel support. Firstly, this paper identifies different fractures by integrating the core observation, imaging logs, and CT scans. The HF in the glutenite reservoir was divided into penetrating-gravel fractures and bypassing-gravel fractures based on the fracture propagation path and fracture surface geometry. Secondly, the occurrence and density of HFs were characterized, respectively. The HF has a dip of 80–90° and two trends of 0°–20° and 160°–220°. The fracture density presents strong heterogeneity over depth and the number of penetrating-gravel fractures is nearly twice of that bypassing-gravel fractures. Besides, no significant proppants were observed on the fracture surface, while it was identified in the rock debris. Thirdly, the gravel size and orientation were selected to investigate the impact of gravel heterogeneity on HFs. The result showed that the larger gravel size and greater acute angle between gravel orientation and HFs propagation orientation are conducive to the development of penetrating-gravel fractures. Finally, the impact of fractured wells on HFs was studied. The fracture density is closely related to the distance between fractures and the perforation site, Cluster spacing, and slickwater. Higher fracture density is a result of closer spacing between HFs and the perforation site, smaller cluster spacing, and a higher percentage of slickwater. The insight of this paper is expected to provide some references for the hydrofracturing operation in oilfields and current experimental and numerical investigation.