Recalculation and understanding of middle and low rank coalbed methane reserves: a case study of Baode Coalbed Methane Field on the eastern edge of Ordos Basin
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摘要: 保德煤层气田位于鄂尔多斯盆地东缘晋西挠折带北段，属于典型的中低煤阶煤层气田。2011年，该气田探明煤层气地质储量183.63×108 m3，技术可采储量91.82×108 m3，截至目前，气田已规模开发6年。由于储量计算参数发生了明显变化，需要重新评估储量的动用情况和可动用性。2018年9月，按照储量规范，结合煤层气自身的产出机理和开发特点，利用动态资料，采用体积法复算了地质储量，采用产量递减法和类比法重新标定采收率，对2011年提交的探明储量进行了复算。复算增加煤层气探明储量29.86×108 m3；采收率标定结果为52%，较2011年增加2%；标定技术可采储量110.94×108 m3，较2011年增加19.12×108 m3。储量复算工作需重点说明计算参数的变化情况，在技术可采储量计算以及采收率确定过程中，在已开发的区域需要按照地质条件进行分类计算。Abstract: The Baode Coalbed Methane Field is located in the northern section of Jinxi Flex Belt on the eastern edge of Ordos Basin. It is a typical coal seam gas field of middle and low ranks. In 2011, the gas field proved 18.363×109 m3 of proven geological reserves and 9.182×109 m3 of technically recoverable reserves. The reserve area has been developed on a large scale for 6 years. The reserve calculation parameters have changed significantly, so it is necessary to reassess the utilization and availability of reserves. In September 2018, we recalculated geological reserves using the volume method and dynamic information by combining reserve specification with the output mechanism and development characteristics of coalbed methane. The production decline method and analogy method were used to recalibrate the recovery rate. Then, the proved reserves submitted in 2011 were recalculated. The proved reserves of coalbed methane increased by 2.986×109 m3 after compounding. The recovery calibration result is 52%, up 2% from 2011. The recoverable reserves of calibration technology were 11.094×109 m3, with an increase of 1.912×109 m3 over 2011. Reserve recalculation focuses on the changes in calculation parameters. In the calculation of technical recoverable reserves and the determination of recovery rate, it is necessary to carry out classification and calculation according to geological conditions in the developed area.
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图 1 鄂尔多斯盆地保德煤层气田地理位置
Figure 1. Geographical location of Baode Coalbed Methane Field, Ordos Basin
图 2 鄂尔多斯盆地保德煤层气田储量区主力煤层厚度变化
Figure 2. Variation of main coal seam thickness in the reserve area of Baode Coalbed Methane Field, Ordos Basin
图 3 鄂尔多斯盆地保德煤层气田储量区主力煤层含气量变化图
Figure 3. Variation of gas content of main coal seam in the reserve area of Baode Coalbed Methane Field, Ordos Basin
图 4 鄂尔多斯盆地保德煤层气田储量区2口单采8+9号煤层煤层气井排采曲线
Figure 4. Drainage and production curves of no.8+9 coal beds in two CBM wells in the reserve area of Baode Coalbed Methane Field, Ordos Basin
图 5 鄂尔多斯盆地保德煤层气田储量区计算单元划分
Figure 5. Unit division of the reserve area in Baode Coalbed Methane Field, Ordos Basin
图 6 鄂尔多斯盆地保德煤层气田储量区产量递减法预测曲线
Figure 6. Prediction curves of production decline method in the reserve area of Baode Coalbed Methane Field, Ordos Basin
表 1 鄂尔多斯盆地保德煤层气田已开发区Ⅰ类井与Ⅱ类井条件对比
Table 1. Comparison of type Ⅰ well and type Ⅱ well conditions in the reserve area of Baode Coalbed Methane Field, Ordos Basin
参数 Ⅰ类井 Ⅱ类井 资源条件 4+5号/8+9号煤层厚度/m 8.5/16 8.0/13 4+5号/8+9号煤层含气量/(m3·t-1) 8.2/8.8 7.0/8.1 资源丰度/(108 m3·km-2) 2.2 1.9 保存条件 封盖能力 泥岩为主 泥岩为主 构造 构造简单 构造简单 埋深/m 500~1 000 500~1 000 水文地质条件 矿化度值2 000~5 000 mg/L 矿化度值1 000~4 000 mg/L 可采条件 4+5号煤层/8+9号煤层渗透率/10-3μm2 6.0/4.0 6.0/5.0 最高产水量/(m3·d-1) 37 39 见套压产水量/(m3·d-1) 20.14 24.29 开机压力/MPa 6.24 7.76 临界解吸压力/MPa 5.29 5.18 临储比 0.85 0.66 排采特征 产气量/m3 3 603 2 051 井底压力/MPa 1.477 1.602 
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