Abstract:

The research taking Budate Group of Beier depression in Hailaer basin as an example, investigated on intensity, stages and pump function of tectonic movements in the study area and the temporal and spatial evolvement. Using the fractal theory, it attained the tectonic intensity after accounting and calculation which indicated that the tectonic movement with the maximal intensity occurred in Suderte, index from 1.5-1.8, and weaken to the surrounding regions. The large quantity of associated fractures is in favor of forming the various kinds of secondary hydrocarbon reservoir owing to their improving in reservoir space. Through the profile of equilibrium and the calculation of fault growth index, combined with buried period, it documented that the strongest tectonic movement occurred in Lower Cretaceous Nantun Formation and has good matching relation in space-time. All of them provided better transport pathway and advantaged reservoir space for oil accumulation. Furthermore, the pump function generated by faults is the main force to transport the hydrocarbon. A large number of faults in Beier depression experienced three stages: unsealing-sealing-open again. This kind of evolution has matched primary hydrogen generation of source rock, and formed abundant petroleum reservoirs in the buried hill of Budate Group finally.

Key words: tectonic movement, fractal theory, pump function, Hailaer basin, Beier depression