储天庆, 雷东记, 闫江伟,等.水力压裂煤体相位频谱曲线试验研究[J].河南理工大学学报（自然科学版）,2023,42(3):34-41.

CHU T Q, LEI D J, YAN J W, et al.Experimental study on phase frequency spectrum curve of hydraulic fracturing coal[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):34-41.

水力压裂煤体相位频谱曲线试验研究

储天庆1, 雷东记1,2, 闫江伟1, 陈鑫源3, 李健1, 周猛1

1.河南理工大学 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地，河南 焦作  454000;2.河南理工大学 中原经济区煤层（页岩）气河南省协同创新中心，河南 焦作  454000;3.河南省煤炭科学研究院有限公司，河南 郑州  450001

摘要:为探明水力压裂前后煤体内部结构改变引起的复电阻率变化规律，在实验室开展加载围压下煤体水力压裂试验，测量压裂前后煤体相位和振幅频谱曲线。结果表明：（1）压裂前后干燥煤体相位频谱曲线均为“U”型，压裂后相位频谱曲线移动明显；（2）含蒸馏水的压裂煤体相位频谱曲线呈“W”型；（3）压裂煤体中，“W”型曲线是由于未充分填充的含水次生裂隙和原有裂隙的不充分界面极化共同所致，这与水力压裂对煤体破坏的不均匀性有关；（4）采用等效电路的方法，用不同电容器代替煤体不同频率界面极化，模拟相位频谱曲线从“W”型变为“U”型的过程发现，未充分填充的含水次生裂隙和原生裂隙在不同频率下的不充分界面极化是产生“W”型曲线的原因。

关键词:水力压裂;界面极化;相位频谱曲线;“W”型曲线;等效电路

doi:10.16186/j.cnki.1673-9787.2021110035

基金项目:国家自然科学基金资助项目（51704101）；河南省高校基础科研项目（NSFRF200307）；中国博士后科学基金资助项目（2019M652535）；河南省高等学校重点科研项目（19A520024，22A440003）

收稿日期:2021/11/10

修回日期:2022/03/14

出版日期:2023/05/25

Experimental study on phase frequency spectrum curve of hydraulic fracturing coal

CHU Tianqing1, LEI Dongji1,2, YAN Jiangwei1, CHEN Xinyuan3, LI Jian1, ZHOU Meng1

1.State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Henan Province Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region，Henan Polytechnic University，Jiaozuo  454000，Henan，China;3.Henan Coal Science Research Institute Co.，Ltd.，Zhengzhou  450001，Henan，China

Abstract:In order to study the change law of complex resistivity of the internal structure of coal before and after hydraulic fracturing，hydraulic fracturing experiments of coal under the condition of loading confining pressure were carried out in the laboratory，and the phase and amplitude spectrum curves of coal before and after fracturing were measured.The results showed that：（1）The phase spectrum curve of dry coal before and after fracturing was“U”-shaped，and the phase spectrum curve moved obviously after fracturing；（2）The phase spectrum curve of fracturing coal containing distilled water was“W”-shaped；（3）In fracturing coal，the“W”curve was caused by the inadequate interfacial polarization of the inadequately filled water bearing secondary fractures and the original fractures，which was related to the unevenness of hydraulic fracturing damage to the coal；（4）The equivalent circuit method was used to simulate the process of changing the phase spectrum curve from“W”type to“U”type by using different capacitors instead of coal interface polarization at different frequencies.The results showed that the insufficient interface polarization of inadequately filled water bearing secondary fractures and primary fractures at different frequencies was the reason for the“W”type curve.

Key words:hydraulic fracturing;interface polarization;phase spectrum curve;“W”type curve;equivalent circuit

水力压裂煤体相位频谱曲线试验研究_储天庆.pdf