| 寿阳区块高阶煤煤体结构及破裂压力测井解释方法 |
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| 引用本文： | 李松林,李忠城,王利娜,段静,向念.寿阳区块高阶煤煤体结构及破裂压力测井解释方法[J].煤田地质与勘探,2020,48(6):146-154. |
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| 作者姓名： | 李松林 李忠城 王利娜 段静 向念 |
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| 作者单位： | 中海油能源发展股份有限公司工程技术分公司,天津 300452;中联煤层气有限责任公司,北京 100022 |
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| 摘 要： | 煤体结构及破裂压力直接影响煤层气开发的工程设计和产气效果，其中煤体结构评价方法较多，但针对寿阳区块高阶煤，地质强度因子（GSI）法效果最好，但其具有很强的地域适用性；煤层的非均质性极强，破裂压力预测效果并不理想。针对上述问题，通过引入取心率、连续心长等参数优化地质强度因子法，进而建立适用于本区的煤体结构定量评价方法，结果表明，其测井解释结果准确性达到86.3%。同时，在煤体结构评价的基础上，引入煤体破碎指数并建立煤层破裂压力预测公式，利用公式计算的破裂压力与实际相对误差2.5%~16.1%，平均误差8%。提出的煤体结构及破裂压力预测方法对沁水盆地高阶煤适用性较好，能够为煤层气勘探开发及压裂改造提供有力支撑。
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| 关 键 词： | 测井曲线 煤体结构 地质强度因子 煤层破碎指数 破裂压力 |
| 收稿时间： | 2020-07-15 |
High rank coal structure and log interpretation method of fracture pressure in Shouyang block |
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| Abstract: | Coal structure and fracture pressure directly affect the engineering design and gas production effect of coalbed methane development. There are many evaluation methods of coal body structure, for the high rank coal in Shouyang block, the geological intensity factor(GSI) method has the best effect, but it has strong regional applicability; The heterogeneity of coal seam is very strong, and the prediction effect of fracture pressure is not ideal. In view of the above problems, the geological intensity factor method is optimized by introducing parameters such as coring rate and continuous coring length, and then a quantitative evaluation method for coal structure in this area is established. The results show that the accuracy of logging interpretation is 86.3%. At the same time, based on the evaluation of coal structure, the coal fragmentation index is introduced and the prediction formula of coal seam fracture pressure is established. The relative error between the calculated fracture pressure and the actual value is 2.5%-16.1%, and the average error is 8%. The prediction method of coal structure and fracture pressure is suitable for high rank coal in Qinshui basin, and it can provide strong support for CBM exploration, development and fracturing. |
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