断裂分维值对矿产资源预测的指示意义—— 以西藏地区为例

• 作 者: 李本亮 张喜慧 孙岩 卢新卫
• 机 构: 南京大学成矿作用研究国家重点实验室
• 出 处: 高校地质学报
• 发表日期: 1999年01期
• 关键词: 分维值 含油气区 断裂体系 分形几何 羌塘盆地 资源预测 油气勘探 勘探区 措勤 金属矿产

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＞１．８０左右，大于整个区域分维质，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。 According to the principle of fractal geometry, Tibet (D = 1784) and its interior Qiangtang (D = 1217) were calculated by using the boxdimensional method. For example, the western part of the basin (D = 1.227) = 1297) fracture fractal dimension values ​​of the three oil and gas exploration areas and Sanjiang metal mineral exploration area (D = 1820). Comparing with fractal dimension of fractures in the hydrocarbon-bearing area in Sichuan Basin, Dexing in Xingxiang and the metallogenic area in Hunan Province, respectively, it is found that the fracture fractal dimension of the petroleum-bearing area ranges from 1 1.80 or so, greater than the entire region of the fractal dimension, the greater the D value, the larger the deposit size. This predicted the Qiangtang, such as the tectonic setting of a hydrocarbon-bearing area in the western part of the basin, and the structural conditions in the Sanjiang area favored the formation of large-scale metal deposits.