渝南地区煤层气压裂微地震地面监测技术研究  

Surface microseismic monitoring for coalbed methane fracturing in south Chongqing

作　　者：谢庆明[1,2] 李大华 张海江[3] 张烨 刘洪[1,2] 王飞[1,2] 谭玉阳 XIE Qing-ming;LI Da-hua;ZHANG Hai-jiang;ZHANG Ye;LIU Hong;WANG Fei;TAN Yu-yang(Chongqing Institute of Geology and Mineral Resources,Key Laboratory of Shale Gas Exploration,Ministry of Land and Resources,Chongqing 400042,China;Chongqing Engineering Research Centre for Shale Gas Resource and Exploration,Chongqing Shale Gas Research Centre of State Key Laboratory of Petroleum Resource and Prospecting,Chongqing 400042,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]重庆地质矿产研究院,国土资源部页岩气资源与勘查技术重点实验室,重庆400042 [2]重庆地质矿产研究院,页岩气勘探开发重庆市工程研究中心,重庆400042 [3]中国科技大学,合肥230026

出　　处：《地球物理学进展》2019年第4期1530-1534,共5页Progress in Geophysics

基　　金：重庆市科技委员会科技项目(cstc2016zdcy-zd90002,cstc2017jxjl20006);重庆市国土资源和房屋管理局科技计划项目(KJ-2018030)共同资助

摘　　要：我国煤层气资源潜力巨大,重庆地区埋深2000 m以浅煤层气地质资源量为0.68×1012 m3,煤层含气量高,揭示渝南地区具有较好的煤层气资源潜力.对渝南地区煤层气井压裂实施微地震地面监测,围绕井中心环形布设40台高精度检波器,采用Match and Locate(M&L)方法识别有效信号,利用改进的双差定位法对事件定位,三段压裂共识别43个有效事件,裂缝长约160 m,缝宽约为80 m,方向北东东—南西西,与该区域现今最大主应力方向相一致.监测结果显示,在压裂规模较小的情况下,微地震信号能量较弱,采用深孔、浅孔和近地表的组合式观测方法,有利于降低监测成本,提高微地震事件的识别率.煤岩多以应力传递的方式发生破裂,微地震信号分布范围较广、且事件较为分散.The resource potential of Coalbed Methane(CBM)in China is huge,the geological resources is 0.68×1012 m3 in Chongqing upon the depth of 2000 m.The CBM in Chongqing is mainly distributed in the upper Permian Longtan formation,the gas content of the CBM is between 9.4~19.7 m3/t,which shows the good potential in south Chongqing.The surface microseismic monitoring is applied in the CBM fracturing,and 40 high precision geophones are set around the center of the fractured well.The Match and Locate(M&L)method is used to identify the effective signals,and the improved double difference location method is used to locate the event.With the processing and comprehensive interpretation,43 effective events are identified in three section fracture,the length and the width of the main fracture is about 160 m and 80 m,respectively.The direction of the fractures is the north east east-south west west,which is consistent with the present maximum principal stress direction.The result shows that,the signal is weak when the fracturing scale is small.Combined with the observation method of deep hole,shallow hole and near surface,which is helpful to reduce the monitoring cost and improve the recognition of microseismic events.Moreover,the fracture is transmited with stress transmission,the events are distributed widely dispersedly.

关 键 词：微地震地面监测 煤层气 水力压裂 渝南地区 裂缝特征 

分 类 号：P631[天文地球—地质矿产勘探]