寺河井田3号煤层含气量三维建模  

Gas Content Modeling of No.3 Coal Seam in District of Sihe Mine Field

作　　者：李勇 陈祖国 徐建军 周加佳 苏善博 张震 LI Yong;CHEN Zuguo;XU Jianjun;ZHOU Jiajia;SU Shanbo;ZHANG Zhen(China Coal Research Institude Xi’an Science and Industry Group,Xi’an 710077,China;Guizhou Yuneng Investment Co.Ltd.,Bijie 551700,China;China Coal Research Institute,Beijing 100013,China)

机构地区：[1]中煤科工西安研究院(集团)有限公司,西安710077 [2]贵州豫能投资有限公司,贵州毕节551700 [3]煤炭科学研究总院,北京100013

出　　处：《科技和产业》2023年第22期275-280,共6页Science Technology and Industry

基　　金：中煤科工西安研究院(集团)有限公司科技创新基金项目(2021XAYJSQ05,2020XAYJS10)。

摘　　要：煤层含气量直接决定了煤层气资源开发的潜力及井下煤炭开采的安全程度,为直观准确地表征煤层含气量空间分布特征,指导下一步工程部署并探索地质工程一体化思路,选取寺河井田西区3号煤层,以28口井的含气量测试、煤样工业分析数据及125口地面井分层数据等为基础,首先建立多元回归含气量预测数学模型,然后借助地质建模软件建立深度、水分、灰分、固定碳三维属性模型,经过模型数值运算,最后生成含气量三维模型,并与气井排采10年内日均产气量的分布特征进行对比。结果表明,数学预测模型可信,以此建立的含气量三维模型内平均含气量为19.95 m 3/t,含气量分布受深度控制较为明显,与常规模型相比,其与实际产能分布特征一致性更高,在高含气区域形成了连片的日均产气量大于4500 m 3/d高产井,模型可靠,对下一步井位部署及数值模拟预测剩余含气量分布具有指导意义。The potential of coalbed methane resource development and the safety of underground coal mining are directly determined by the coalbed gas content.In order to intuitively and accurately characterize the spatial distribution characteristics of coalbed gas content,guide the next project deployment and explore the idea of geology and engineering integration.The No.3 coal seam in the west area of Sihe mine field was selected.Based on the data of the tested gas content and industrial analyzed coal samples of 28 wells and the coal seams layered data of 125 surface wells,firstly the multivariate regression mathematical model of gas content prediction was established.Then the three-dimensional attribute model of burial depth,moisture content,ash content,and fixed carbon content were established by geological modeling software,Finally the three-dimensional gas content model was built by numerical calculation in the geological modeling software,which was compared with the distribution characteristics of the average daily gas production within 10 years of gas well drainage.The results show that the mathematical prediction model is credible.The average gas content is 19.95 m 3/t in the three-dimensional gas content model established by this method,and the distribution of gas content is obviously controlled by the burial depth.Compared with the conventional gas modeing,it is more consistent with the actual production capacity distribution characteristics.Contiguous high-yield wells with an average daily gas production of more than 4500 m 3/d are formed in high gas-contenting areas.The model is reliable and has guiding significance for the next well location deployment and numerical simulation to predict the distribution of remaining gas content.

关 键 词：多元回归 煤层气 含气量三维建模 地质工程一体化 

分 类 号：TD712[矿业工程—矿井通风与安全]