Evaluation of coalbed methane extraction effect based on 3D geological modeling technology: An example of Sihe Mine in Jincheng City
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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 m3/t降至2022年5.65 m3/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。Abstract: 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 m3/t in 2010 to 5.65 m3/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.
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图 5 3号煤层原始含气量模拟空间展布
Fig. 5 Simulated spatial distribution of original gas content of No. 3 Coal Seam
图 6 3号煤储层压力动态变化模拟空间展布
Fig. 6 Simulated spatial distribution of reservoir pressure dynamic changes of No.3 Coal Seam
7 西二盘区产气量动态变化模拟空间展布
7 Simulated spatial distribution of gas production dynamic changes in west-second panel
图 8 西二盘区剩余含气量动态变化模拟空间展布
Fig. 8 Simulation space distribution of the dynamic change of the remaining gas content in west-second panel
表 1 寺河煤矿西二盘区及相邻区块3号煤储层压力
Table 1 Reservoir pressure of No. 3 Coal Seam in west-second panel of Sihe Mine and adjacent blocks
井号 储层压力/
MPa压力梯度/
(kPa·m−1)地应力梯度/
(kPa·m−1)SHX-292 0.85 2.35 18.10 SHX-295 0.78 2.47 18.70 YH091 2.11 4.83 20.30 YH093 2.26 8.22 29.90 
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表 2 寺河煤矿西二盘区3号煤原始含气量实测结果
Table 2 Measured results of original gas content of No. 3 Coal Seam in west-second panel of Sihe Mine
编号 含气量/(m3·t−1) 采样时间 编号 含气量/(m3·t−1) 采样时间 1 22.40 2005-07 18 19.88 — 2 26.33 2005-07 19 20.03 — 3 24.28 2005-07 20 19.50 — 4 24.92 2005-07 21 22.53 — 5 20.30 2005-07 22 22.65 — 6 22.17 2005-07 23 20.21 — 7 19.64 — 24 23.80 — 8 19.97 — 25 22.69 — 9 22.15 — 26 21.52 2008-03 10 27.79 2005-07 27 24.24 2008-12 11 22.53 — 28 11.04 2008-12 12 23.28 2005-07 29 26.18 2008-07 13 19.65 — 30 25.90 2007-12 14 23.15 2005-07 31 23.96 2007-11 15 19.73 — 32 22.62 2008-08 16 20.03 — 33 21.52 2008-03 17 19.50 —
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表 3 寺河煤矿西二盘区数值模拟参数
Table 3 Numerical simulation parameters in west-second panel of Sihe Mine
参数 数值 煤厚/m 5.03~7.48 埋深/m 214~460 高程/m 254~347 储层压力/MPa 3.26 渗透率/10−3 μm2 0.8 孔隙率/% 2.0 含气量/(m3·t−1) 15~28 CH4体积分数/% 97 VL/(m3·t−1) 59 pL/MPa 2.63 吸附时间/d 11.0 煤密度/(t·m−3) 1.46
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表 4 煤层气井排采第10—第15年间预测日平均产气量
Table 4 Predicted daily average gas production of CBM well drainage during the 10th to 15th years
井号 第10—第15年
平均产气量/(m3·d−1)井号 第10—第15年
平均产气量/(m3·d−1)井号 第10—第15年平均产气量/(m3·d−1) SHX150 1 141 SHJM-29 945 SHX115 441 SHX190 939 SHX135 297 SHJM-26 316 SHX191 1 492 SHX136 315 SHJM-30 648 SHX193 961 SHX137 1 162 SHX104 297 SHX194 1 904 SHX138 609 SHX104-1 331 SHX195 1 501 SHX139 502 SHX120 747 SHX236 2 258 SHX130 790 SHX254 804 SHX228 2 045 SHX230 1 914 SHX101 1 180 SH299 859 SHJM-27 971 SHX102 173 SH13-31 1 193 SHJM-23 933 SHX103 771 SHX146 645 SHJM-31 697 SHX105 908 SHX148 1 080 SHX123 734 SHX106 999 SHX227 2 167 SHX124 590 SHX107 212 SHX240 882 SHX125 432 SHX108 0 SHX131 853 SHX126 771 SHX109 1 636 SHX144 1 248 SHX128 745 SHX110 1720 SHX147 610 SHX129 391 SHX111 339 SHX142 560 SH293 247 SH288 617 SHX143 596 SHX122 956 YH092 347 SHX234 2 352 SHJM-24 359 YH024 508 SHX145 699 SHX127 804 YH093 342 SHX249 1 148 SHX257 570 YH089 963 SHX140 333 SHX113 311 SHX252 953 SHX141 656 SHX116-1 586 SH287 599 SHX226 1 477 SHX118 478 YH084 0 SHX132 1 179 SHX119 983 YH085 960 SHX133 605 SH291 1 207 YH086 1 198 SHJM-28 642 SHX112 568 YH087 10 SHX134 391 SHX114 599
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表 5 寺河矿西二盘区抽采效果评价
Table 5 Evaluation of drainage effect in west-second panel of Sihe Mine
参数井 原始含气量/(m3·t−1) 检验井 预测剩余含气量/(m3·t−1) 降低率/% SHX-126 22.53 ZX-X2JY-01 7.35 67.38 SHX-127 21.94 66.50 SHX-146 22.69 ZX-X2JY-02 4.63 79.59 SHX-144 20.21 ZX-X2JY-03 5.16 74.47 SHX-145 23.8 78.32 SHX-128 19.65 ZX-X2JY-04 3.94 79.95 SHX-129 21.62 81.78 SHX-138 22.53 ZX-X2JY-05 7.75 65.60 SHX-139 22.65 65.78 平均 21.96 5.77 73.26
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表 6 三维地质模型预测剩余含气量与实测剩余含气量对比
Table 6 Comparison of the remaining gas content predicted by the 3D geological model and the measured remaining gas content
检验井 实测剩余含气量/(m3·t−1) 三维模型预测剩余含气量/(m3·t−1) 绝对误差/(m3·t−1) 相对误差/% ZX-X2JY-01 7.85 7.35 −0.50 6.37 ZX-X2JY-02 6.20 4.63 −1.57 25.32 ZX-X2JY-03 5.02 5.16 0.14 2.79 ZX-X2JY-04 3.70 3.94 0.24 6.49 ZX-X2JY-05 4.07 7.75 3.68 90.42
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