断裂分维值对矿产资源预测的指示意义

应用分形几何的原理，采用数盒维法计算了西藏地区（Ｄ＝１．７８４）及其内部羌塘（Ｄ＝１．２１７）、比如盆地西部（Ｄ＝１．２２７）、措勤（Ｄ＝１．２９７）三个油气勘探区和三江金属矿产勘探区（Ｄ＝１．８２０）的断裂分维值。分别与四川盆地含油气区，江西德兴和湘中金属矿产区的断裂分维值比较，发现含油气区的断裂分维值大致介于１〈Ｄ〈１．２４，明显低于整个区域断裂分维值，Ｄ值越小，越有利于油气成藏；金属矿产区Ｄ；D>l 80左右，大于整十区域分维质，D值越大，矿床规模越大。此预测了羌塘、比如盆地西部具备含油气区的构造条件．三江地区的构造情况利于形成大规模金属矿床。

SIGNIFICANCE OF DIM ENSION VALUE D OF FAULT SYSTEMS IN EVALUATING NATURAL RESOURCES WITH TIBET AS AN EXAMPLE

The principles of fractal geometry and method of box-counting dimension have been used to calculate the fractal dimension value D of fault systems in three oil-gas prospecting areas (Qiangtang, Biru, Cuoqin) and an ore-deposit prospecting area (Sanjiang) in the Tibet region. The values were then compared with those of the oil-gas area in Sichuan, ore-deposit areas in Dexin, Jiangxi province and in central Hunan province respectively. It has been found that the dimension of fault systems in the oil-gas hearing areas is l 1.80, larger than that of the whole region. The larger the dimension, the larger the scale of ore-deposit. The results of this study suggest that it is hopeful to find certain oil-gas fields in the Qiaiagtang and Biru prospecting areas, and high-grade ore-deposit in the Sanjiang prospecting area.