Abstract: Fractures and sheet cave mainly develop in the ultra-deep and fault-controlled formation in Shunbei region. Horizontal well is adopted in this region to exploit the oil and gas because horizontal well can transversely pass through the fractured-caved formation. The well-test curves are complex and various. According to the middle curve characteristics after the wellbore storage and skin effects, the real well-test curves of Shunbei Region can be divided into 3 categories. The curve characteristics of the 3 categories can directly reflect the different contact relationship of horizontal well with fractures and caves. In addition, according to the late curve characteristics, the 3 categories can be further divided into 9 subcategories. The curve characteristics of the 9 subcategories differ each other and reflect different development status of fractures and caves in the periphery of horizontal well. At the end, the physical models of 3 categories and 9 subcategories, which are corresponding to the real well-test curves of 3 categories and 9 subcategories, are presented for well-test interpretations and evaluations. The research results in this article can be used to guide the work of well-test analysis and study for Shunbei region, and can also be used to guide the work of well-test study for other deep and fault-controlled formations

Key words: Shunbei Region, deep reservoir, fault-controlled formation, cave, well test