Research Of Structural Characteristics Of Gaoyou Depression

This thesis is guided by structural geometry, kinology and dynamics. Using lots of basic data, the structural form, evolution history and formation mechanism are researched. The structural feature of south terrace and north slope are analyzed stressly.Gaoyou depression is one of the sub-depression of Subei basin. It could be compartmentalized as three sub-structural unit from south to north. They are south terrace, middle low-lying and north slope. Complex fracture system are formed after many structural movements. It is of high value to clarify the feature of fracture and evolution process.Zhenwu fracture belt, Hanliu fracture belt and Wubao fracture belt are the three main fracture belts in Gaoyou depression whose formation and evolution are controlled by them in different parts. All the fracture belts are of their own structural feature. There are multitudinous transfer structure in the fracture belt. The textural shape of Gaoyou depression is different in different parts. It could be compartmentalized as western part, middle part and eastern part which are of different structural feature.Yizheng movement, Wubao movement and Sanduo movement happened ordinally in Gaoyou depression and then regional unconformity formed. According to the feature of unconformity and stockwerke, the sedimentary cover could be compartmentalized as upper, middle and subjacent stockwerke. Fault activity is different because of different intensity of structural movement. Main fault activity of each period is analyzed by growth index and fault fall.The formation mechanism of Gaoyou depression is influenced by the alternation of plate activity and regional structural stress field in each period. The formation and evolution of depression are also influenced by the Tanlu fracture nearby. Subei basin which Gaoyou depression lies in is a faulted extend basin of continental margin in east of China. So the formation mechanism of Gaoyou depression should be discussed in both faulted mechanism and extend mechanism. Then extend structure\reversal structure and transfer structure which are intently related to hydrocarbon are analyzed stressly.South terrace is one of sub-structural unit in south of Gaoyou depression. In this area, the evolution history of the main faults including Zhen①fault, Zhen②fault and Zhen②′fault is burring. Through the analysis of structural evolution and quantitative research of fault activity, the development history of the three main faults is verified. It also could be supported by structural physical simulation.North slope is one of the sub-structural unit in north of Gaoyou depression. Two sets of diabases which intruded in Meso-cenozoic develop widely in this area. On the base of morphological analysis, the intrude period of diabase is settled by many proof. Many kinds of transfer structure which develop in the complex fracture system are identified. It is useful to establish structural analyze model and dissect the rule of hydrocarbon.Structure could effect oil source rock, hydrocarbon migration, trap formation and hydrocarbon abundance zone. Through the research above, the control action of structure to hydrocarbon in Gaoyou depression is analyzed.