准噶尔盆地西北缘断裂体系分形特征与油气藏分布

Fractal characteristics and reservoir distribution of fault system in the northwest margin of Jungar basin

陈新 卢华复 浦世照 陈忠民 李世宏

Chen Xin Lu huafu Pu Shizhao Chen Zhongmin Li Shihong

应用分形理论对准噶尔盆地西北缘油气区的断裂体系进行研究,发现断裂的平面分布具有分形特征。对于断裂体系而言,分形维数越大,则断裂分布越不均匀,断裂越发育。在此基础上,讨论了断裂的性质及走向与分形维数的关系。正断裂以NW向为主,自相似性强,其分维数(0.5623)大于NE向正断裂的分维数(0.5611)。逆断裂则以NE向断裂为主,自相似性强,其分维数(1.1356)大于NW向逆断裂的分维数(0.9880)。在有断裂发育的油气藏中,其分维数(1.9640)大于无断裂油气藏的分维数(1.7630)。而在有逆断裂发育的油气藏中,其分维数(1.9540)更是远远大于有正断裂油气藏的分维数(1.1460)。

Study of fault system with the fractal theory reveals that the plane distribution of the faults has fractal characteristics in the northwest margin of Jungaar basin.Fault systems with larger fractal dimension consist of better developed and less evenly distributed faults.Based on this understanding,the relationship between the nature and trend of the faults and the fractal dimensions has been explored.The normal faults in the region are dominated by NW-trending faults,with strong self-similarity and larger fractal dimension(0.5623) than that of NE trending normal faults(0.5611).While the reverse faults are dominated by NE-trending faults,with strong self-similarity and larger fractal dimension(1.1356) than that of NW-trending reverse faults(0.9880).Reservoirs with well developed faults have larger fractal dimension(1.9640) than those without faults(1.7630),and reservoirs with reverse faults have a fractal dimension(1.9540) much larger than those with normal faults(1.1460).

10.11743/ogg20060412