Tectonic fractures can effectively improve the seepage capacity of rock mass and are the main channels for underground fluid migration. The rupture of Xujiahe Formation rock mass in the central YB area has good self-similarity and fractal characteristics under the tectonic stress field. Taking the fractal characteristics of the fault and core fracture as a bridge, the quantitative relationship between them is established, and the quantitative prediction of a fracture development zone in the second member of the Xujiahe Formation is carried out. The results show that the faults and fractures in the second member of the Xujiahe Formation have a good similarity in the formation stage, combination morphology, and extension direction, which is the basis of fracture prediction by the fractal method. Fault and fracture distribution has obvious fractal characteristics; the fractal dimensions are between 0.6547–1.503 and 1.0733–1.7276, respectively; and the correlation coefficient is generally greater than 0.9. The areas with big fractal dimensions are the wells YL29-YL30-YB5-YL5-YB9 in the middle area, YL32-YL4 in the southeast, and RL1 in the east, and the more developed the faults are, the more developed the fractures are. The prediction of fracture zones based on the fractal theory provides a new idea for fracture research.

构造裂缝可有效提高岩体的渗流能力，是地下流体运移的主要通道。YB区中部须家河组岩体破裂在构造应力场作用下具有良好的自相似性和分形特征。以断层和岩心裂缝的分形特征为桥梁，建立了两者之间的定量关系，开展了须家河组二段裂缝发育带的定量预测。结果表明，须家河组二段断层和裂缝在形成阶段、组合形态、伸展方向等方面具有较好的相似性，是分形法预测裂缝的基础。断层和裂缝分布具有明显的分形特征；分形维数分别在 0.6547-1.503 和 1.0733-1.7276 之间；相关系数一般大于0.9。分形维数较大的区域为中部YL29-YL30-YB5-YL5-YB9井，东南部YL32-YL4井，东部RL1井，断层越发育，裂缝越发育. 基于分形理论的裂缝带预测为裂缝研究提供了新思路。断层越发育，裂缝越发育。基于分形理论的裂缝带预测为裂缝研究提供了新思路。断层越发育，裂缝越发育。基于分形理论的裂缝带预测为裂缝研究提供了新思路。