Research on Sweet Spot Characteristics and Exploration and Development Strategies for Reservoirs in the Qiulitage Structural Belt, Tarim Basin: A Case Study of the ZQ Block

ABSTRACT The Qiulitage structural belt is a significant oil and gas bearing structural unit in the Kuqa foreland basin of the Tarim Basin. Traditionally, its reservoirs have been considered to be dominated by pore‐type storage, with high‐quality reservoir development primarily attributed to matrix porosity and permeability. However, actual exploration and development reveal contradictory “high porosity, low permeability” characteristics, which deviate considerably from conventional understanding. This study elucidates the unique reservoir characteristics through integrated analyses of microfeatures, rock mechanics, and tectonic stress. Results indicate that the Qiulitage structural belt experiences relatively weak compressional stress compared with the Kelasu structural belt, and the rock strain remains in the stress accumulation stage. Although high porosity is preserved, stress concentration causes closure of seepage channels, leading to significantly reduced permeability. Only in fracture‐developed areas where stress release occurs can the synergistic effect of fractures and pores form an effective seepage system. Such stress‐release and fracture‐developed zones, therefore, constitute the sweet spots of high‐quality reservoirs. On the basis of these findings, we propose a development strategy that combines three‐dimensional (3D) geomechanical modeling with fracture prediction technology to optimize well placement and trajectory design. This approach provides theoretical foundations and practical guidance for the efficient development of the Qiulitage structural belt and analogous reservoirs in foreland basins.