| 雨汪井田超压含煤地层孔隙特征及孔隙体积模量演变规律 |
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| 作者姓名： | 车玉燕 邹冠贵 殷裁云 曾葫 佘佳生 |
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| 作者单位： | 1.中国矿业大学(北京)地球科学与测绘工程学院，北京 100083 |
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| 基金项目： | 国家重点研发计划2018YFC0807803山西省科技重大专项MQ2015-02 |
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| 摘 要： | 煤及煤层气开发中的异常高压现象会对资源开发带来危险，从而威胁到人员和财产的安全。本文选取云南雨汪煤矿的6个煤样，联合CT扫描技术和低温液氮吸附实验方法，分析测试得到超压煤样孔隙半径、孔喉半径、孔容-孔径微分分布的孔隙特征参数；基于Gassmann模型的机理，推导了不同围压条件下的干燥及饱和超压煤样孔隙体积模量。结果表明:雨汪煤矿超压地层煤样孔隙率偏大，可达到10 %，孔隙形状主要为球形和柱体，孔隙大小以介孔为主。干燥煤样的纵横波速度随围压的施加呈非线性增加。饱和煤样孔隙体积模量随围压的增加而变大，围压相同时，孔隙体积模量在水饱和度大于90 % 时迅速增加。
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| 关 键 词： | 煤 异常高压 孔隙率 孔隙特征 孔隙体积模量 |
| 收稿时间： | 2021-10-17 |
The evolution law of pore characteristics and pore bulk modulus for overpressured coal-bearing formation in Yuwang Minefield |
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| Affiliation: | 1.College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 10083, China2.State Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, China3.China Huaneng Group CO., LTD, Beijing 100070, China |
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| Abstract: | The abnormal high pressure in coal and coalbed methane exploitation will bring danger to exploitation, thus threatening the safety of personnel and property.Six coal samples collected from Yuwang colliery in Yunnan province were analyzed by CT scanning and low-temperature liquid nitrogen adsorption experiment.Analysis reveals the characteristic parameters of pore radius, pore throat radius and pore volume-pore diameter differential distribution of overpressured coal samples.Meanwhile, the pore bulk modulus of overpressured coal samples under different confining pressures is derived based on the mechanism of the Gassmann model.The results show that the porosity of Yuwang colliery overpressured stratum can reach 10 %, and the mesoporous pore shape is mainly spherical and cylindrical.The shear wave velocity of dry coal samples increases nonlinearly with confining pressure.The pore bulk modulus of saturated coal sample remains proportional to confining pressure, but increases rapidly when the water saturation exceeds 90 % with the same confining pressure. |
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