Zubair subzone is the southernmost unit of the Mesopotamian zone of Iraq and the most oil-producing region in Iraq. Rumaila, Zubair, Ratawi, Tuba, Nahr Umr, Majnoon, Luhais, Subba, Sanam, and Siba are subsurface structures that form the oilfields in the Zubair subzone. Seismic and well-log data were collected from different sources and used to conduct the geometric and genetic analyses of these structures at the top of the Mishrif Formation. The results show that there are two types of structures; these are anticlines and salt structures. The anticlines can be classified geometrically into linear, brachy, and culmination. The most prominent linear anticlines are Rumaila and Zubair, which are long and relatively narrow anticlines with an N–S trend separated by broader synclines. Each one of these two anticlines consists of two domes separated by a saddle. Brachy anticlines include Tuba, Luhais, and Subba. Ratawi is the only culmination fold in the area. The salt structures are Nahr Umr, Majnoon, Sanam, and Siba. The structures of the Zubair subzone have formed as a result of the Alpine orogeny of the collision between the Arabian and Eurasian plates, the salt tectonics of the Infracambrian Hormuz Formation, and the movements of basement rocks. All these factors have controlled forming the subsurface structures. The anticlines are affected mostly by the Alpine orogeny and the basement faults, while the salt structures are affected mostly by the salt tectonics. Three major basement faults with NE-SW trend control the distribution of saddles and plunging areas of the subsurface structures. Other shorter faults with the N–S trend, which are parallel to the hinge lines of the anticlines, control the asymmetry of the anticlines, especially Rumaila and Zubair.