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Effect analysis of borehole microseismic monitoring technology on shale gas fracturing in western Hubei 被引量:2
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作者 Li Juan Yu Bing-Song +3 位作者 Tian Yu-Kun Kang Hai-Xia Wang Yu-Fang Zhou Hui 《Applied Geophysics》 SCIE CSCD 2020年第5期764-775,902,共13页
Hydraulic fracturing technology is an important means of shale gas development,and microseismic monitoring is the key technology of fracturing effect evaluation.In this study,hydraulic fracturing and microseismic moni... Hydraulic fracturing technology is an important means of shale gas development,and microseismic monitoring is the key technology of fracturing effect evaluation.In this study,hydraulic fracturing and microseismic monitoring were simultaneously conducted in the Eyangye 2HF well(hereinafter referred to as EYY2HF well).The target stratum of this well is the second member of the Doushantuo Formation of the Sinian System,which is the oldest stratum of horizontal shale gas wells in the world.A total of 4341 microseismic fracturing events were identified,and 23 fracturing stages of the well were defined.The fluctuation of the number of events showed a repeating“high-low”pattern,and the average energy of these events showed minimal differences.These findings indicate that the water pressure required for the reconstruction of the EYY2HF well is appropriate.The main body of the fracture network extended from northwest to southeast,consistent with the interpretation of regional geological and seismic data.The stimulated rock volumes showed a linear increase with the increase of the fracturing stage.Some technological measures,such as quick lift displacement,quick lift sand ratio,and pump stop for secondary sand addition,were adopted during fracturing to increase the complexity of the fracture network.Microseismic fracture monitoring of the well achieved expected eff ects and guided real-time fracturing operations and fracturing eff ect evaluation. 展开更多
关键词 microseismic technology borehole monitoring hydraulic fracturing shale gas western Hubei Province
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Evolution and analysis of gas sorption-induced coal fracture strain data 被引量:1
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作者 Zhanghao Liu Jishan Liu +3 位作者 Pengzhi Pan Derek Elsworth Mingyao Wei Rui Shi 《Petroleum Science》 SCIE CAS CSCD 2020年第2期376-392,共17页
Although coal swelling/shrinking during coal seam gas extraction has been studied for decades,its impacts on the evolution of permeability are still not well understood.This has long been recognized,but no satisfactor... Although coal swelling/shrinking during coal seam gas extraction has been studied for decades,its impacts on the evolution of permeability are still not well understood.This has long been recognized,but no satisfactory solutions have been found.In previous studies,it is normally assumed that the matrix swelling/shrinking strain can be split between the fracture and the bulk coal and that the splitting coefficient remains unchanged during gas sorption.In this study,we defined the fracture strain as a function of permeability change ratio and back-calculated the fracture strains at different states.In the equilibrium state,the gas pressure is steady within the coal;in the non-equilibrium state,the gas pressure changes with time.For equilibrium states,the back-calculated fracture strains are extremely large and may be physically impossible in some case.For non-equilibrium states,two experiments were conducted:one for a natural coal sample and the other for a reconstructed one.For the fractured coal,the evolution of permeability is primarily controlled by the transition of coal fracture strain or permeability from local matrix swelling effect to global effect.For the reconstituted coal,the evolution of pore strain or permeability is primarily controlled by the global effect. 展开更多
关键词 coal seam gas fracture strain Experimental data EQUILIBRIUM STATE NON-EQUILIBRIUM STATE
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Influence of Water Injection Fracturing on Crack Damage in Soft Coal and Application in Gas Extraction
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作者 Zhirong Wang Jianshi Jin +1 位作者 Zhongyang Hang Xiangzhi Hu 《Journal of Power and Energy Engineering》 2014年第4期1-6,共6页
In order to study the hypotonic and rheological particularity of “three soft” coal seam in west Henan, China, this paper explored the stress and damage characteristics of crack in coal under condition of water injec... In order to study the hypotonic and rheological particularity of “three soft” coal seam in west Henan, China, this paper explored the stress and damage characteristics of crack in coal under condition of water injection fracturing based on ABAQUS platform;The cohesive element in T-P damage evolution criterion was used to describe the approximately linear relationship between crack width and extending distance in soft coal. The simulation results show that stress evolution and crack damage in soft coal is a gradually developing process under condition of water injection fracturing. When the static pressure is 4 - 10 MPa, and the injection time is about 1 - 2 hours, the damage range of crack in soft coal can basically reach an ideal data of 80 - 100 m, and then greatly improve the hypotonic performance of “three soft” coal seam. 展开更多
关键词 “Three Soft” coal seam Directional Water INJECTION fracturing CRACK Damage gas EXTRACTION
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Current status and technical challenges of C_(2)storage in coal seams and enhanced coalbed methane recovery:an overview 被引量:22
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作者 Xiaochun Li Zhi-ming Fang 《International Journal of Coal Science & Technology》 EI CAS 2014年第1期93-102,共10页
In the past two decades,research on C_(2)storage in coal seams and simultaneously enhanced coalbed methane recovery(ECBM)has attracted a lot of attention due to its win–win effect between greenhouse gas(C_(2))emissio... In the past two decades,research on C_(2)storage in coal seams and simultaneously enhanced coalbed methane recovery(ECBM)has attracted a lot of attention due to its win–win effect between greenhouse gas(C_(2))emission reduction and coalbed methane recovery enhancement.This paper presents an overview on the current status of research on C_(2)-ECBM in the past two decades,which involves C_(2)storage capacity evaluations,laboratory investigations,modelings and pilot tests.The current status shows that we have made great progress in the ECBM technology study,especially in the understanding of the ECBM mechanisms.However,there still have many technical challenges,such as the definition of unmineable coal seams for C_(2)storage capacity evaluation and storage site characterization,methods for C_(2)injectivity enhancement,etc.The low injectivity of coal seams and injectivity loss with C_(2)injection are the major technique challenges of ECBM.We also search several ways to promote the advancement of ECBM technology in the present stage,such as integrating ECBM with hydraulic fracturing,using a gas mixture instead of pure C_(2)for injection into coal seams and the application of ECBM to underground coal mines. 展开更多
关键词 C_(2)storage in coal seams ECBM PERMEABILITY Hydraulic fracture gas mixture
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Horizontal borehole azimuth optimization for enhanced stability and coal seam gas production
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作者 Erfan Saber Qingdong Qu +2 位作者 Saiied MAminossadati Yiran Zhu Zhongwei Chen 《Rock Mechanics Bulletin》 2024年第1期115-126,共12页
Horizontal boreholes have been widely used to extract natural gas from coal seams.However,these boreholes can encounter severe instability issues leading to production interruption.Optimizing drilling azimuth is a pot... Horizontal boreholes have been widely used to extract natural gas from coal seams.However,these boreholes can encounter severe instability issues leading to production interruption.Optimizing drilling azimuth is a potential solution for enhancing borehole stability while considering gas production.In this work,we improved and implemented a dual-porosity,fully coupled geomechanical-hydraulic numerical model into COMSOL Multiphysics to investigate into this factor.The sophisticated numerical model incorporates various critical factors,including desorption-induced matrix shrinkage,stress-dependent anisotropic fracture permeability,and the interactions of gas flow and reservoir deformation in matrices and fractures.A suite of simulation scenarios(e.g.,varying coal strength)was carried out to quantify the impact of drilling azimuth on coal permeability evolution,cumulative gas production,and the borehole break-out width for Goonyella Middle Seam of Bowen Basin,Australia.The model was calibrated against both theoretical permeability values and field gas production data.Due to the lack of directly measured matrix permeability data,the actual gas production was used to back calculate the best-matched matrix permeability,which is 0.65μD for this particular work.Moreover,based on the breakout shape and induced volumetric strains around the borehole,drilling along the maximum horizontal stress does not necessarily lead to the best stability of the borehole,as generally believed.A drilling azimuth between 0and 60results in similar breakout width,whereas a drilling azimuth between 60and 90achieves the most efficient gas production.By considering both gas production efficiency and borehole stability,for this particular reservoir condition,the optimum drilling azimuth is determined to be between 45and 60.This study presents a practical approach for determining the optimum drilling azimuth in coal seam gas extraction through in seam boreholes. 展开更多
关键词 coal seam gas Borehole stability gas desorption Directional fracture permeability Borehole break-out
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Evaluation of Microseismicity Related to Hydraulic Fracking Operations of Petroleum Reservoirs and Its Possible Environmental Repercussions
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作者 Abdulaziz M. Abdulaziz 《Open Journal of Earthquake Research》 2014年第2期43-54,共12页
Petroleum reservoir operations such as oil and gas production, hydraulic fracturing, and water injection induce considerable stress changes that at some point result in rock failure and emanation of seismic energy. Su... Petroleum reservoir operations such as oil and gas production, hydraulic fracturing, and water injection induce considerable stress changes that at some point result in rock failure and emanation of seismic energy. Such seismic energy could be large enough to be felt in the neighborhood of the oil fields, therefore many issues are recently raised regarding its environmental impact. In this research we analyze the magnitudes of microseismicity induced by stimulation of unconventional reservoirs at various basins in the United States and Canada that monitored the microseismicity induced by hydraulic fracturing operations. In addition, the relationship between microseismic magnitude and both depth and injection parameters is examined to delineate the possible framework that controls the system. Generally, microseismicity of typical hydraulic fracturing and injection operations is relatively similar in the majority of basins under investigation and the overall associating seismic energy is not strong enough to be the important factor to jeopardize near surface groundwater resources. Furthermore, these events are less energetic compared to the moderately active tectonic zones through the world and usually do not extend over a long period at considerably deep parts. However, the huge volume of the treatment fluids and improper casing cementing operation seem to be primary sources for contaminating near surface water resources. 展开更多
关键词 microseismic HYDRAULIC fracturing fracture monitoring UNCONVENTIONAL RESERVOIRS SHALE gas
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分段多簇密切割压裂技术在淮南矿区煤层气抽采中的应用
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作者 刘超 袁广 +3 位作者 李浩哲 刘亮 孙四清 彭煜敏 《煤炭技术》 CAS 2024年第2期166-170,共5页
针对淮南矿区碎软低渗煤层瓦斯抽采技术难题,以13-1煤层为例,在分析煤层及其顶底板概况的基础上,采用煤层顶板分段压裂水平井技术,充分利用水平井水平段,单段分3簇射孔,簇间距25 m,实现分段多簇密切割体积压裂改造。微地震监测结果表明... 针对淮南矿区碎软低渗煤层瓦斯抽采技术难题,以13-1煤层为例,在分析煤层及其顶底板概况的基础上,采用煤层顶板分段压裂水平井技术,充分利用水平井水平段,单段分3簇射孔,簇间距25 m,实现分段多簇密切割体积压裂改造。微地震监测结果表明,单段裂缝长度102.5~211.4 m,缝高17.3~27 m,裂缝主体向下延伸,实现了井筒与煤层的沟通。排水采气效果表明,最高产气量1519 m^(3)/d,取得了良好的产气效果。研究成果为淮南矿区煤层气地面预抽和瓦斯区域治理提供了工程借鉴。 展开更多
关键词 分段多簇密切割压裂 煤层顶板水平井 淮南矿区 煤层气 微地震监测
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Analysis of the visible fracture system of coalseam in Chengzhuang Coalmine of Jincheng City,Shanxi Province 被引量:4
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作者 Shengwei Wang Guangjiu Hou +1 位作者 Ming Zhang Qinping Sun 《Chinese Science Bulletin》 SCIE EI CAS 2005年第S1期45-51,共7页
In No. 3 coalseam of Chengzhuang Coalmine of Jincheng City, there exists the visible fracture system consisting of joints, gas-expanding fractures and cleats. The gas-expanding fractures develop mainly in the bright c... In No. 3 coalseam of Chengzhuang Coalmine of Jincheng City, there exists the visible fracture system consisting of joints, gas-expanding fractures and cleats. The gas-expanding fractures develop mainly in the bright coal sub-layer and cleats, in the vitrain and bright coal. The joints fall into two types, one developing in the coalseam and the other cutting through the whole coalseam and entering into the top and bottom rock layer. The development direction of joints is basically similar to that of gas-expanding fractures: NNE and NNW. The formation of the visible fracture system is classified as the stage of the development of cleat fissures in the coalification period, the stage of the full development of cleats and the formation of gas-expanding fractures in the second coalification period and the stage of the formation of joints by structural function. There is the spatial unhomoge-neity in three dimensions for the visible fracture system of the coal seam in Chengzhuang Coalmine: the regular distribution of the visible fractures as groups in the plane and the coal sub-layer with high permeability rate in profile. The research findings of the visible fracture system of coal seam can be applied to the drilling of the coalbed methane and to heightening the let-off efficiency of coalseam gas. 展开更多
关键词 the VISIBLE fracture SYSTEM of coal seam development character origin coalbed permeability gas let-off of coalseam. DOI: 10.1360/98zk0008
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强冲击特厚煤层地面压裂覆岩运动规律
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作者 邓辉 《陕西煤炭》 2024年第6期5-10,共6页
坚硬覆岩运动是诱发冲击地压的关键因素之一。为揭示覆岩运动对工作面冲击的孕育致灾过程及诱冲机理,以孟村煤矿401102工作面为工程背景,采用理论分析的方法研究了覆岩空间结构演化特征。针对高位覆岩坚硬顶板实施地面L型水平井分段水... 坚硬覆岩运动是诱发冲击地压的关键因素之一。为揭示覆岩运动对工作面冲击的孕育致灾过程及诱冲机理,以孟村煤矿401102工作面为工程背景,采用理论分析的方法研究了覆岩空间结构演化特征。针对高位覆岩坚硬顶板实施地面L型水平井分段水力压裂技术,结合理论分析以及现场监测的方法,分析了压裂后采场覆岩运动时空演化规律。结果表明,地面压裂弱化区域硬厚复合砂岩层得到充分弱化,高能微震事件大幅降低;而地面压裂盲区硬厚复合砂岩层形成悬顶结构,弹性能没有得到提前释放,导致工作面开采至下方时会诱发岩层的突然断裂与运动,形成高能微震事件并释放巨大的微震能量。 展开更多
关键词 冲击地压 特厚煤层 覆岩运动 地面压裂 微震监测
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煤矿冲击地压的微地震监测研究 被引量:260
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作者 姜福兴 杨淑华 +3 位作者 成云海 张兴民 毛仲玉 徐方军 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2006年第5期1511-1516,共6页
为了研究煤矿冲击地压与岩层在三维空间破裂之间的关系,进而探索依据岩层破裂规律预测和预报冲击地压的可能性,文中采用自行研制的防爆型微地震定位监测(MS)系统,基于定位原理,监测了山东华丰煤矿冲击地压煤层(四层煤)及其解放层(六层煤... 为了研究煤矿冲击地压与岩层在三维空间破裂之间的关系,进而探索依据岩层破裂规律预测和预报冲击地压的可能性,文中采用自行研制的防爆型微地震定位监测(MS)系统,基于定位原理,监测了山东华丰煤矿冲击地压煤层(四层煤)及其解放层(六层煤)开采过程中的岩层破裂过程和二次应力场分布变化的过程,得到了如下结论:冲击地压的发生与岩层破裂密切相关,四层煤下顺槽处于六层煤顶板破裂区的外边缘时,正处于高应力区内,在此处掘进容易引发冲击地压,必须将六层煤下顺槽位置向实体煤侧移动20 m以上,或将四层煤下顺槽位置内移20 m以上,才能消除四层煤的冲击地压;六层煤和四层煤开采时,工作面前方断层活化的距离分别为250 m和350 m左右,根据这一距离,及时对断层带进行卸压处理,可以消除由断层带引发的冲击地压;监测显示了工作面周围岩层的三维破裂形态和范围,为矿井确定防水煤柱的高度提供了可靠的依据;监测证明了厚层砾岩的破裂、断层活化、采场附近关键层的破裂是引起冲击地压的主要原因,证明了所研制的硬件和定位软件具有较高的精度和实用性,可以在煤矿和边坡、隧道等领域应用. 展开更多
关键词 微地震监测 煤矿 冲击地压 岩层运动 定位
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煤层气井压裂裂缝井下微地震监测技术应用分析 被引量:17
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作者 张平 吴建光 +4 位作者 孙唅森 张晓朋 高海滨 吴翔 左景栾 《科学技术与工程》 北大核心 2013年第23期6681-6685,6691,共6页
分析了井下微地震裂缝监测测试技术原理、震源定位计算方法及现场测试方法。介绍了沁水盆地南部柿庄南区块煤层气井井下微地震裂缝监测测试解释结果。通过对监测解释结果分析,认识到柿庄南区块煤层压裂裂缝形态复杂,空间展布显现出网络... 分析了井下微地震裂缝监测测试技术原理、震源定位计算方法及现场测试方法。介绍了沁水盆地南部柿庄南区块煤层气井井下微地震裂缝监测测试解释结果。通过对监测解释结果分析,认识到柿庄南区块煤层压裂裂缝形态复杂,空间展布显现出网络裂缝及非对称裂缝的特征,裂缝延伸方位为北东向或东南向,与断层走向平行或垂直,各种压裂工艺形成的裂缝形态及几何尺寸差异较大;结果对压裂工艺选择、施工参数优化设计及井网部署提供了重要的依据。 展开更多
关键词 煤层气 压裂 微地震 裂缝监测
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煤矿井下微震监测系统及应用 被引量:24
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作者 李凤琴 张兴民 姜福兴 《煤田地质与勘探》 CAS CSCD 北大核心 2006年第4期68-70,共3页
介绍了微地震监测系统原理、方法,分析了微地震监测仪器结构、性能及施工措施,并结合微地震监测技术在煤矿井下监测中所遇到的问题,提出了一些具体的技术措施。
关键词 矿井 岩层破裂 微地震 监测 煤矿安全
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微震监测技术及其在煤矿的应用现状与展望 被引量:90
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作者 李楠 王恩元 GE Mao-chen 《煤炭学报》 EI CAS CSCD 北大核心 2017年第S1期83-96,共14页
微震监测技术是利用煤岩破裂产生的微震信息来研究煤岩结构和稳定性的一种实时、动态、连续的地球物理监测方法,主要包含微震传感器台网优化、微震信号识别及到时拾取、波速模型、微震波形特征、震源定位与成像、震源机制、微震监测预... 微震监测技术是利用煤岩破裂产生的微震信息来研究煤岩结构和稳定性的一种实时、动态、连续的地球物理监测方法,主要包含微震传感器台网优化、微震信号识别及到时拾取、波速模型、微震波形特征、震源定位与成像、震源机制、微震监测预警等。近30 a来,微震监测技术在煤矿安全高效生产中得到了广泛应用。煤岩破坏过程中的微震波形特征、震源定位、矿震活动性规律、冲击地压微震监测预警等方面取得了一系列研究成果;在煤与瓦斯突出、突水、煤岩水力压裂、井下救援的微震监测方面进行了初步研究和探索,并取得了一些有益研究结果。然而煤矿微震监测仍然有很多问题需要进行系统深入研究,主要包含如下:煤岩不同破坏类型,特别是流体作用或参与下的微震波形信号特征;高精度的微震信号自动识别和到时自动拾取;基于微震监测的被动成像理论与技术;煤岩动力灾害前兆信息智能感知和多元信息融合监控预警体系;煤岩水力压裂裂缝微震监测与定位成像技术等。同时还应加快发展和完善具有自主知识产权的高性能、高精度、高可靠性的微震监测系统。 展开更多
关键词 煤矿 微震监测技术 震源定位 煤岩动力灾害 监测预警 水力压裂监测 微震成像 展望
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微地震定位监测的深孔检波器及其安装技术 被引量:17
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作者 杨淑华 张兴民 +1 位作者 姜福兴 陈强 《北京科技大学学报》 EI CAS CSCD 北大核心 2006年第1期68-70,100,共4页
介绍了在煤矿井下采用微地震定位监测技术监测岩体破裂的原理和开发研制的两种检波器及其安装方法。“液压安装法”适用于钻孔深度在50m以内的中硬及硬岩层,且检波器可以回收复用;“药包安装法”适用于软弱的岩层和深度50~100m的钻孔... 介绍了在煤矿井下采用微地震定位监测技术监测岩体破裂的原理和开发研制的两种检波器及其安装方法。“液压安装法”适用于钻孔深度在50m以内的中硬及硬岩层,且检波器可以回收复用;“药包安装法”适用于软弱的岩层和深度50~100m的钻孔。该监测技术在现场得到试验验证并开始在工程中加以应用。 展开更多
关键词 微地震监测 检波器 安装技术 岩体破裂 煤矿 矿山压力
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基于微震监测的深埋煤层顶板导水裂隙带发育特征 被引量:24
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作者 侯恩科 范继超 +4 位作者 谢晓深 龙天文 张唤兰 王建辉 樊志刚 《煤田地质与勘探》 CAS CSCD 北大核心 2020年第5期89-96,共8页
导水裂隙带发育高度是矿井水害预测的重要技术参数之一。以彬长矿区文家坡煤矿4103工作面为研究对象,利用井–地联合微震监测技术对顶板导水裂隙带发育特征进行研究。研究结果表明:深埋煤层开采时,微震事件超前工作面回采位置发育,超前... 导水裂隙带发育高度是矿井水害预测的重要技术参数之一。以彬长矿区文家坡煤矿4103工作面为研究对象,利用井–地联合微震监测技术对顶板导水裂隙带发育特征进行研究。研究结果表明:深埋煤层开采时,微震事件超前工作面回采位置发育,超前影响角最大为35°,最小为28°;断层的存在降低了覆岩稳定性,相较于正常基岩,更易在回采影响下发生应力集中和破坏;断层加大了微震事件发生的超前距,而采空区则使微震事件的高密度区向其所在部位发生偏移,加剧覆岩破坏程度,增大导水裂隙带发育高度;垂向上,4103工作面监测区内的微震事件高密度区域主要集中在高程+400^+520 m,结合微震事件数量和能量分布特征,判定4103工作面垮落带发育高度为50 m,垮采比13.16,导水裂隙带发育高度为117 m,裂采比为30.79。该成果可为彬长矿区类似煤矿深埋煤层顶板导水裂隙带发育高度研究及顶板水防治提供重要依据。 展开更多
关键词 井–地联合微震监测 微震事件 导水裂隙带 覆岩破坏特征 文家坡煤矿
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微震监测技术在矿井岩层破裂监测中的应用 被引量:193
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作者 姜福兴 XUN Luo 《岩土工程学报》 EI CAS CSCD 北大核心 2002年第2期147-149,共3页
介绍了澳大利亚联邦科学工业研究院勘探采矿局 (CSIRO)开发的用于岩层破裂监测的微震监测系统 ,为能将之应用于中国深井灾害的监测 ,提出了对软硬件改造和开发井下智能化、自动化和可视化微震监测系统的初步方案 。
关键词 煤矿 微地震 岩层破裂 微震监测 矿井
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井下水力压裂煤层顶板应力监测及其演化规律 被引量:4
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作者 黄飞 李树清 左伟芹 《矿业工程研究》 2018年第3期23-27,共5页
针对井下水力压裂过程中未考虑水头压力对煤层顶板地应力的影响,导致煤层顶底板容易被破坏的问题,以松藻矿区同华煤矿水力压裂为例,采用空心包体应力计监测压裂过程中顶板应变变化规律,根据岩石应力-应变关系及检测结果计算出压裂前后... 针对井下水力压裂过程中未考虑水头压力对煤层顶板地应力的影响,导致煤层顶底板容易被破坏的问题,以松藻矿区同华煤矿水力压裂为例,采用空心包体应力计监测压裂过程中顶板应变变化规律,根据岩石应力-应变关系及检测结果计算出压裂前后煤层顶板地应力增量的大小和方向,分析水力压裂水头压力对煤层顶板地应力的影响规律.结果表明:(1)煤岩体起裂时,顶板主应力增量达到最大值且与煤层起裂压力在数值上基本相等,以煤层起裂方向为基准,主应力的方位角与倾角均发生了相应的旋转;(2)煤层起裂后顶板主应力增量急剧减小,主应力方位角和倾角逐渐恢复至初始状态;(3)停止压裂后,顶板主应力较初始状态均有所增大,主应力方位角和倾角与初始状态基本一致,说明水力压裂能够改变煤层顶板应力状态. 展开更多
关键词 水力压裂 煤层顶板 空心包体应力计 应力监测
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煤层底板破碎带区域注浆围岩稳定性分析 被引量:3
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作者 任波 余国峰 +3 位作者 牟文强 韩云春 李连崇 魏廷双 《煤矿安全》 CAS 北大核心 2021年第10期171-176,共6页
受地质隐蔽性、复杂性影响,裂隙存在注浆不到位而开采诱发二次破坏的安全风险。以张集矿1612A工作面邻近导水破碎带注浆底板为背景,基于所提出的数值模拟与微震监测结合的分析方法,研究了破碎带注浆治理效果,揭示了注浆前后采动应力影... 受地质隐蔽性、复杂性影响,裂隙存在注浆不到位而开采诱发二次破坏的安全风险。以张集矿1612A工作面邻近导水破碎带注浆底板为背景,基于所提出的数值模拟与微震监测结合的分析方法,研究了破碎带注浆治理效果,揭示了注浆前后采动应力影响及注浆岩体的稳定性。结果表明:相比较未注浆时,注浆围岩的应力异常区域减小,不再发生耦合贯通至工作面;应力在距巷帮约10 m后随距离增大扰动程度减小。微震监测同时验证了计算结果:岩石破裂信号在注浆波及区发生"绕路"现象,注浆区域微震事件数量较少,注浆岩体处于稳定状态。 展开更多
关键词 煤层底板 破碎带 注浆岩体 数值计算 微震监测
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煤层顶板“两带”高度的微地震监测技术 被引量:33
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作者 于克君 骆循 张兴民 《煤田地质与勘探》 CAS CSCD 北大核心 2002年第1期47-51,共5页
主要介绍了中国和澳大利亚两个煤矿在长壁开采过程中的微地震监测咸果,并进行了深入的 理论分析和研究。该监测的主要目的是动态测定煤层开采过程中顶板岩石“两带”(冒落带和裂隙 带)的发展规律和高度,以指导相邻采区留设合理的防... 主要介绍了中国和澳大利亚两个煤矿在长壁开采过程中的微地震监测咸果,并进行了深入的 理论分析和研究。该监测的主要目的是动态测定煤层开采过程中顶板岩石“两带”(冒落带和裂隙 带)的发展规律和高度,以指导相邻采区留设合理的防水或防砂煤柱。观测结果表明:研究区域“两 带”的最大高度均没有到达煤层上方的含水层,顶板突水的可能性非常小,这一结果与实际情况符 合;同时也表明微地震监测是确定“两带”高度及设计防水和防砂煤柱的一种可靠手段。 展开更多
关键词 微地震监测 煤层顶板 冒落带 裂隙带 煤层开采 煤柱
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大埋深倾斜厚煤层下导水裂隙带发育高度的微震监测 被引量:4
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作者 李新旺 温学君 +2 位作者 代卫林 程立朝 孙利辉 《中国科技论文》 CAS 北大核心 2023年第5期526-533,共8页
以九龙矿15249S工作面为工程背景,利用微震监测技术对上覆岩层塑性区破坏变化规律及导水裂隙带发育高度进行监测,并结合理论计算、数值模拟与现场实测结果进行对比,验证微震监测较高的准确性。结果表明,微震监测结果更为接近现场实测数... 以九龙矿15249S工作面为工程背景,利用微震监测技术对上覆岩层塑性区破坏变化规律及导水裂隙带发育高度进行监测,并结合理论计算、数值模拟与现场实测结果进行对比,验证微震监测较高的准确性。结果表明,微震监测结果更为接近现场实测数据。监测结果显示:工作面及其回采巷道上方130 m范围内,微震事件分布密集、能量较大,故该空间内上覆岩体破坏变形较为严重,裂隙较为发育;当超过130 m时,微震事件骤减,数量几乎为0;因此得到导水裂隙带发育高度为130 m。研究成果可为九龙矿的安全生产提供可靠参考,并为类似的大埋深倾斜厚煤层工作面提供一种有效监测导水裂隙带发育高度的方法。 展开更多
关键词 微震监测 大埋深倾斜厚煤层 导水裂隙带 数值模拟 理论计算 现场实测
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