爆炸荷载下致密砂岩天然裂缝方位角对裂纹扩展规律研究  

On Propagation Law of Natural Fractures in Different Azimuths in Tight Sandstone under Layer Explosion

作　　者：肖青育 朱哲明[1,2] 谢军 XIAO Qingyu;ZHU Zheming;XIE Jun(College of Architeeture and Environment,Sichuan University,Chengdu 610065,China;Key Laborato~T for Energy Engineering Safety and Disaster Mechanics of Ministry of Education,Sichuan University,Chengdu 610065;College of Water Conservancy and Hydropower Engineering,Sichuan Agricultural University,Ya＇an 625014,China)

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学能源工程安全与灾害力学教育部重点实验室,四川成都610065 [3]四川农业大学水利水电学院,四川雅安625014

出　　处：《成都大学学报（自然科学版）》2018年第3期319-325,共7页Journal of Chengdu University（Natural Science Edition）

基　　金：国家自然科学基金(11672194;11702181);四川省科技厅科技支撑计划(2018JZ0036)资助项目

摘　　要：为研究在爆炸荷载作用下致密砂岩层内天然裂缝方位角对裂缝起裂扩展并形成一定范围裂缝网络的影响规律,利用致密砂岩板和乳化炸药及声发射仪进行了层内爆炸室内模拟试验,探讨了储层缝内爆炸下水力裂缝两侧附近的多条平行、共线致密砂岩层内天然裂缝在不同方位角下裂缝的起裂扩展规律.结果表明:当方位角较小时,多裂缝均能起裂扩展并能相互贯通,且方位角在45°～60°范围时有利于最大程度形成裂缝网络.In order to study the regular influence of the azimuth of natural fractures（NF） on the initiation and propagation of fractures and the formation of a certain range of fracture network in the tight sandstone reservoir under explosive loading, the paper discusses the reservoir cracks under explosive hydraulic fracture near both sides of a plurality of parallel collinear NF in different azimuth of crack initiation and extension rule based on indoor simulation experiment of explosion layer by utilizing the tight sandstone plate and emulsion explosive and acoustic emission instrument. The results show that when the azimuth angle is small, the multi cracks can crack and expand and can pass through each other, and when the azimuth angle is in the range of 45° - 60°, it is conducive for the maximum fracture to be formed.

关 键 词：致密砂岩 层内爆炸 多裂缝 裂缝网络 

分 类 号：TE14[石油与天然气工程—油气勘探] P618[天文地球—矿床学]