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分形几何作为定量描述自然界中复杂非线性现象的强有力工具,将其应用于南海南部断裂体系的研究中,通过数盒子法计算了断裂分布的分维值。研究结果表明这种方法是可行的,断裂分布的分维值能有效地描述断裂的空间分布特征。南海南部断裂体系在标度区间25～250km内具有很好的统计自相似性,全部断裂的分维值为1.6601,北东向断裂的为1.3875,北西向断裂的为1.2693。根据断裂分维等值线,沿西南海盆扩张轴,两侧断裂呈对称展布;北东向的与北西向的在空间上有一定的互补性,这反映了两组断裂在发育过程中的相互制约性。结合南海的构造演化及南海南部油气盆地的分布,初步探讨了断裂分形特征与南海的构造演化及断裂分形特征与油气盆地分布之间的关系。
As a powerful tool to quantitatively describe complex nonlinear phenomena in nature, fractal geometry is applied to the study of the southern South China Sea fault system. Fractal distribution fractal dimension values are calculated by the box method. The results show that this method is feasible. The fractal dimension of fracture distribution can effectively describe the spatial distribution of faults. The southern South China Sea fault system has good statistical self-similarity within 25 ~ 250km of scale interval, the fractal dimension value of all faults is 1.6601, the north-east fault is 1.3875 and the north-west fault is 1.2693. According to the fractal contour of fractures, along the axis of expansion in the southwestern basin, the faults on both sides are symmetrically distributed; the NE and NW directions are spatially complementary, which reflects that during the development of the two faults Mutual restraint. Based on the tectonic evolution of the South China Sea and the distribution of oil and gas pools in the southern South China Sea, the relationship between the fractal features and the tectonic evolution and fractal characteristics of the South China Sea and the distribution of oil and gas pools is discussed.