工程地质学报2017，Vol.25Issue(6)：1557-1565,9.DOI:10.13544/j.cnki.jeg.2017.06.019
龙马溪组页岩三维缝网重构及分形分析
RECONSTRUCTION AND FRACTAL ANALYSIS FOR THREE-DIMENSIONAL FRACTURE NETWORK OF LONGMAXI SHALE
摘要
Abstract
Recent studies were based on the small samples which were as big as core samples to get the fracture propagation features.However,the small samples had many limitations.For example,continuous fracture propagation characteristics were difficult to get,which means it was a tough work to analyze the relationship between in-situ stress and fracture distribution.Hence,fracture propagation characteristics were gathered from a 2m×3m×0.7m samples from Shizhu County,Chongqin.The sample was cut into several cubic samples whose lengths of the sides were 30cm.At the same time,every surface of the cubic sample is numbered.Then the fracture distribution characteristics on each surface of the samples is obtained.The 3D fracture network is rebuilt according to the surface number.The fracture network shows the obvious rules that there are more fractures on the surface in the principle stress direction in contrast to other directions.The fractures on the surface perpendicular to the principle stress are 62°to the principle stress direction.Research on the fractal dimension proves that fractures on the different surfaces conform to the fractal dimension feature,which indicates that fractures' structure in small scale and big scale have similar regularity.In addition,fracture density and fractal dimension number in the maximum principle stress direction are bigger than other directions,which means fracture network structure is more complex.And fracture network structure in the surface perpendicular to the principle stress is less complex than that in the minimum horizontal stress direction.There are more bedding fractures in the horizontal stress direction while more shear fractures in the vertical direction,which are-62°to the minimum horizontal principle stress direction.关键词
页岩/三维缝网/裂缝特征/涪陵地区/分形Key words
Shale/3D fracture network/Fracture feature/Fulin area/Fractal分类
天文与地球科学引用本文复制引用
兰恒星,伍宇明,李全文,陈俊辉,赵晓霞..龙马溪组页岩三维缝网重构及分形分析[J].工程地质学报,2017,25(6):1557-1565,9.基金项目
中国科学院战略性先导科技专项(B类)(XDB10030300),国家自然科学基金国家杰出青年基金项目(41525010),国家自然科学基金创新群体项目“地理时空数据分析”(41421001)资助. （B类）
