【作者】 许建东； 曲国胜；

【Author】 Xu Jiandong Qu Guoshang(Institute of Geology, China Seismological Bureau , Beijing )

【机构】 中国地震局地质研究所；

【摘要】 本文提出了一种以ARC/INFO为平台的裂缝网络一维频度(f)和二维密度(d)测量技术,通过对37个天然裂缝网络频度和密度的测量以及相关关系分析,发现了两者之间的线性关系.在给定裂缝长度分布函数的前提下,推导出了有量纲裂缝密度(d)与无量纲裂缝密度(D,裂缝度)的解析关系.利用这些关系式对已知的37个天然裂缝网络的裂缝密度(d)和裂缝度(D)进行了计算,最后应用交叉实验法对计算结果作了统计检验.检验结果表明,以指数函数描述裂缝长度分布可以较为准确地利用裂缝一维频度去估算天然裂缝网络的二维裂缝度.更多还原

【Abstract】 We developed an ARC/INFO based technology to calculate fracture frequency and densities for a given fracture network. Using this technique we calculated the frequency (f) and densities (d and D) of 37 natural fracture trace maps, and we investigated the statistical relationship between fracture frequency and fracture density (f). We derived analytical solutions for converting dimensional density ( d) to non - dimensional densities ( D) assuming that fracture length distribution follows an exponential law. A comparison between observed and calculated results based on the equations we developed shows that 1) there exists a linear relationship between fracture frequency and fracture density (f), and this relation can be used to estimate fracture density ( d ) if the fracture frequency is determined from a scanline survey or from borehole data; 2) the analytical solutions we derived can accurately determine the non-dimensional 2 - D fracture density (D) in practice if the fracture length distribution function is assumed.更多还原