基于三维地质建模技术的煤层气抽采效果评价——以晋城寺河煤矿为例  

Evaluation of coalbed methane extraction effect based on 3D geological modeling technology:An example of Sihe Mine in Jincheng City

作　　者：姜在炳 杨建超 李勇 庞涛 JIANG Zaibing;YANG Jianchao;LI Yong;PANG Tao(Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China)

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤田地质与勘探》2022年第2期55-64,共10页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2016ZX05045-002);陕西省创新能力支撑计划项目(2018TD-039)。

摘　　要：三维地质建模可直观、可视化评价煤层气动态抽采效果,为后续开发方案调整提供指导。借助三维地质建模软件,以晋城寺河煤矿西二盘区3号煤层为研究对象,基于寺河煤矿地质、产能数据分析和数值模拟,建立能反映煤层空间几何形态变化、构造特征及煤储层属性参数动态变化的地质模型,实现研究区煤层气抽采效果动态评价。利用构建的三维地质模型开展产气量、储层压力分布、剩余含气量等重要参数的预测,结果表明:寺河煤矿煤层气井不同排采周期预测的平均日产气量逐渐降低,影响范围逐渐扩大;研究区平均储层压力从2010年的1.31 MPa降至2022年的0.60 MPa,较2010年下降54%;研究区平均剩余含气量从2010年的15.70 m^(3)/t降至2022年5.65 m^(3)/t。研究结果可真实、客观地为三维地质模型在煤层气抽采效果评价中的应用提供科学依据。Three-dimensional geological modeling can intuitively and visually evaluate the effect of coalbed methane(CBM)dynamic drainage,and provide guidance for subsequent adjustments to development plans.With the help of 3D geological modeling software,No.3 Coal Seam of west-second panel is taken as the research object.A geological model that can reflect the spatial geometric changes and structural characteristics of coal seams,and the dynamic changes of coal reservoir attribute parameters is established based on the analysis of geological and productivity data and numerical simulation,to realize the dynamic evaluation of the CBM extraction effect in the study area.The constructed three-dimensional geological model is used to predict important parameters such as gas production,reservoir pressure distribution,and remaining gas content.The results show that the average daily gas production predicted in different drainage cycles of the CBM wells in Sihe Mine will gradually decrease,and the scope of influence will gradually expand.The average reservoir pressure in the study area will drop from 1.31 MPa in 2010 to 0.60 MPa in 2022,a decrease of 54%from 2010.The average remaining gas content in the study area will drop from 15.70 m^(3)/t in 2010 to 5.65 m^(3)/t in 2022.It provides a scientific basis for the application of the three-dimensional geological model in the effect evaluation of CBM extraction in a factual and objective way.

关 键 词：三维地质建模 静态属性 动态属性 剩余含气量 抽采效果 

分 类 号：TD712[矿业工程—矿井通风与安全]