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叶桢妮, 侯恩科, 段中会, 高阳. 基于热-流-固耦合效应的地层构造控气特征研究[J]. 煤炭科学技术, 2019, (7).
引用本文: 叶桢妮, 侯恩科, 段中会, 高阳. 基于热-流-固耦合效应的地层构造控气特征研究[J]. 煤炭科学技术, 2019, (7).
YE Zhenni, HOU Enke, DUAN Zhonghui, GAO Yang. Study on effect of geotectonic characteristics on coalbed methane based on coupled thermal-hydraulic-mechanical model[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (7).
Citation: YE Zhenni, HOU Enke, DUAN Zhonghui, GAO Yang. Study on effect of geotectonic characteristics on coalbed methane based on coupled thermal-hydraulic-mechanical model[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (7).

基于热-流-固耦合效应的地层构造控气特征研究

Study on effect of geotectonic characteristics on coalbed methane based on coupled thermal-hydraulic-mechanical model

  • 摘要: 地质构造控气特征是煤层气开发潜力评价的基础科学问题。为了揭示不同构造类型模式下煤层气分布特征,以郭家河井田一盘区地质构造精细勘查为研究背景,采用三维地震勘查及多属性融合技术方法,获得郭家河井田一盘区地质构造展布特征,并以一盘区1302回采工作面构造形态为案例,建立考虑热-流-固耦合效应的地质构造控气数值计算模型,分析背斜、断层和向斜的轴部/翼部位置附近煤层气密度、压力、温度和渗透率的变化规律,揭示不同构造部位附近煤层气分布特征。研究结果表明:通过建立考虑煤层热-流-固耦合效应的地质构造控气数值模型,得出厚煤层向斜构造轴部位置是煤层气富集区和抽采有利区,构造轴部位置附近煤层气密度、压力、温度和渗透率参量均较高且出现明显的抬升增长趋势;原始地应力对煤层构造挤压应力集中(无逸散通道)位置附近具有煤层气保压优势、无逸散条件下煤层气压力大于106Pa,原始地应力对断层带张拉作用不利于煤层气保压,而断层带为主要的煤层气逸散通道,断层上下盘位置附近煤层气压力变化有明显波动特征;郭家河井田三维地震勘查厚煤层向斜构造共10条,综合考虑井田煤层气含量和构造控气分布特征,得出一盘区1310工作面东部Xn1向斜轴部和1309工作面中部B6背斜翼部为煤层气抽采有利区。

     

    Abstract: The tectonics effect on coalbed methane distributions is a scientific challenge in evaluation of extraction potential ability of coalbed methane.To study the distributions of coalbed methane around tectonic settings in coal seams,we select No.1 panel of Guojiahe coal mine as the research background.Detailed tectonic features and geotectonic distributions in No.1 panel have been explored by three-dimensional seismic exploration survey and multi-properties fusion methods.Then,a numerical model was built considering coupled thermal-hydraulic-mechanical model to reveal the tectonic setting such as anticlines,faults and anticline effect on coalbed methane density,pressure,temperature and permeability distribution.The results show that the density,pressure,temperature,and permeability near axis of syncline in thick coal seams are significantly high by using the thermal-hydraulic-mechanical model.Original compressive stress maintains the stress for coalbed methane preserving at 106 Pa with non-diffusion conditions.The tension stress is unfavorable for gas preservation and the gas pressure near the fault is various because faults induced by tensional force may provide diffusion channels for gas.Ten synclines in thick coal seam were found using three-dimensional seismic exploration survey in Guojiahe coal mine.According to the gas content distribution under tectonic settings,Xn1 syncline axis section at the eastern side of No.1310 mining face and B6 anticline wing section at the middle of No.1309 mining face are considered as favorable extraction areas.

     

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