深部煤系储层损伤扩容点的天然裂隙与围压效应及声发射识别  

Effect of natural fracture and confining pressure on damage-dilatancy point of deep coal measures reservoir and acoustic emission identification

作　　者：郝宪杰 杨怀翔[2] 张通 崔凡 陈博闻[2] 罗江昊 张珀钒 张洪岚 李润泽 杨芳婷 HAO Xianjie;YANG Huaixiang;ZHANG Tong;CUI Fan;CHEN Bowen;LUO Jianghao;ZHANG Pofan;ZHANG Honglan;LI Runze;YANG Fangting(Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining,Anhui University of Technology,Huainan,Anhui 232000,China;School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Mining Response and Disaster Prevention and Control of Deep Coal Mines,Anhui University of Technology,Huainan,Anhui 232000,China;School of Earth Science and Mapping Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]安徽理工大学煤炭安全精准开采国家地方联合工程研究中心,安徽淮南232000 [2]中国矿业大学(北京)能源与矿业学院,北京100083 [3]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232000 [4]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《中国矿业大学学报》2023年第4期648-659,共12页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(52174097);深部煤矿采动响应与灾害防控国家重点实验室开放基金项目(SKLMRDPC21KF02);煤炭安全精准开采国家地方联合工程研究中心开放基金项目(EC2021005);中央高校基本科研业务费项目(2022JCCXNY03);中国矿业大学(北京)大学生创新训练项目(202311001,202211012);安徽省优秀青年基金项目(2022AH030086)。

摘　　要：由于天然裂隙的不可重复性,创新采用数理统计方法结合单轴、三轴压缩和声发射试验研究了天然裂隙和围压作用对煤系非常规天然气储层损伤强度的影响及其综合效应特征,并分析了声发射识别对储层损伤扩容点的判别可靠性,结果表明:围压对损伤强度具有线性强化效应,天然裂隙对损伤强度具有先慢后快的非线性弱化效应;获得了体积应变和声发射2种方法下围压和天然裂隙对损伤强度的拟合方程,其中围压起主要作用,天然裂隙起次要作用;受天然裂隙影响,在侧向应变测量点初期激增时,声发射参数法更能反应储层整体情况,所得出的损伤扩容点更具有可靠性.Due to the non-repeatability of natural fractures,mathematical statistical methods have been innovatively adopted,and combined with uniaxial and triaxial compression and acoustic emission tests.The influence of natural fractures and confining pressure on the failure strength of unconventional gas reservoirs in coal measures were obtained,and the reliability of acoustic emission identification of damage-dilatancy points was analyzed.The results show that confining pressure has a linear strengthening effect on the damage strength and natural fractures have a non-linear weakening effect on the damage strength,which is slow first and then fast.Fitted equations for damage strength of natural fractures and confining pressure by volume strain and acoustic emission methods are obtained,in which confining pressure plays a major role and natural fractures play a minor role.Affected by natural fractures,the measurement point value of lateral strain may initially surges,which declare that the acoustic emission method can better reflect the overall situation of coal gas reservoir,and damage-dilatancy point determined by acoustic emission method is more reliable.

关 键 词：煤系非常规天然气储层 损伤扩容点 损伤强度 天然裂隙 围压效应 声发射识别 

分 类 号：TE321[石油与天然气工程—油气田开发工程]