Structural Characteristics And Evolution Analysis Of Aika Fault Zone In Sikeshu Sag Of Southern Junggar Basin

The Aika fault zone is located in the northern part of the Sikeshu sag and is a key research area for further oil and gas exploration.The western part of the fault zone has promising oil and gas development background,but the drilling failure of wells in its work area indicates its complex internal structural background.Therefore,the focus of this paper is the three-dimensional area of the fault zone.Based on the fine interpretation of three-dimensional seismic data,the paper analyzes the stress condition of the main fault as well as the stratum control function,further analyzes the key sections and plane structural styles in the work area,and finally combines the balanced section technology to restore the structure in the study area,synthesizes fault analysis and other contents to analyze the evolution of structure,and summarizes the matching relationship between the structural activity and the hydrocarbon accumulation in the work area.Through the above research,it is found that most of the faults in the study area are reverse faults,and the strike direction is mainly northwest and near east-west.The main active periods are late Hercynian-early Yanshan and mid-late Himalayan.There are no conditions for acquiring oil and gas in situ in the 3D area,which depends on the long-distance migration of oil and gas.The secondary faults in the middle and late stages of the Himalaya match the maximum hydrocarbon expulsion period of the hydrocarbon generation center.The main channel.