Research On The Structural Feature Of Hailaer Basen

For the complicated tectonic characteristics of Hailaer basin, this paper made full use of 2-d and 3-d seismic data, and adapt the method of inertia associating with activity and the local associating with the whole, and systematically studied the geometry and kinetic characteristics of the structures in the basin, and then analysed the evolution history and origin mechanism of the basin. Based on the analysis above, the relationship of the tectonics with oil and gas was investigated.Through the research of the knowledge, draws the following:1. According to the type of sequence interface and its characteristics, the basin can be divided into the two basic tectonic layers, i.e.basinal and basement tectonic layer, the former are subdivided into 5 first order tectonic layers and 7 secondary order layers.2. From the structure characteristic of its transverse section, there are two basic types of depression in the Hhailaer basin:the halfgraben-like and graben.The former are major and include the independent and associative. As a whole, subsags of combination characteristic on plane shows two categories:synchronization opposite and same direction combinations.3. The fractures in the basin are of various types and commplex genesis:According to their genesis and control action to structures, sediments and traps, they can be divided into four levels; on the basis of their genesis, they can be classed into the basement fault systems, extensional fault systems, wrench fault systems, inversion fault systems.On the plane and profile, they can be combined into a variety of combination type; Their development period are two curtain and four periods.4. The structural styles in the basin can be classced into the extensional structural styles, the strike-slip structural styles, the adjusting structures and the inversion-period structural styles.The transfer faults as a major type among the adjusting structures.The inversion-period structures can be divided into the neo-structures and the stacking structures, and the listric thrust fault and snake head structure were identified for the first time.5. The subsiding history analysis indicates that the Hailaer basin can be divided into three distinct subsiding curtain, i.e. the rapid subsiding, stable subsiding and slow subsiding period. Different depression shows different subsiding characteristics, which reflects the characteristics of different extenssion in different depression.6. From the formation and reformation of the basin, Hailaer basin can be divided into six formation periods and four reformation periods.7 Hailaer basin developed over the Haixi fold basement in the Mz-Cz era, it formed by reactivating of pre-existence compressionin-wrench fractures, in the later period process of evolution, the effect stress of extension, shear and compressional inversion rooted in the movement pattern of the Kula-Pacific oceanic plate, i.e.depends on the direction,speed and angle of Kula-Pacific plate subduction to Eurasian plate.8. Fractures controled the space distribution of the source, reservoir and caprock, andcontroled the formation, types and distribution of traps. The adjustment and inversion tectonic belts are favorable hydrocarbon accumulation zones.Multiple unconformity, formed by polycyclic evolution of the basin, played an important role to the migration and accumulation of oil and gas.