Xi’an Research Institute of China Coal Technology & Engineering Group,Xi’an　 710077,China

水力压裂是煤层气增产改造的常用手段,对压裂效果的好坏有重要意义,对比压裂前后的瞬变电磁探测数据是一种对其有效的评价方法。探讨了瞬变电磁波场变换理论,实现了对瞬变电磁信号中波场特性的提取,提出了基于虚拟波场波形特征的速度分析反演成像方法。计算了三维数值模型数据的反演结果,对存在较小形态变化的裂缝取得了良好的成像效果。开展了两次工程试验,对瞬变电磁虚拟波场反演成像方法检测井下煤层气压裂裂缝形成情况的实用性和可靠性进行了检验。研究表明:瞬变电磁虚拟波场反演成像方法能够有效应用于井下煤层气水力压裂效果检测。

Hydraulic fracturing is a common method for increasing the production of coal-bed gas,the fracturing effect is important,and the transient electromagnetic is an effective method for its detection. In this paper,the authors dis- cussed the theory of transient electromagnetic wave-field transformation,realized the extraction of wave-field character- istics from transient electromagnetic signal,proposed an inversion imaging method of velocity analysis based on the waveform characteristics of pseudo wave-field,calculated the inversion results of a three-dimensional numerical model data,achieved an excellent imaging effect for cracking. At last,the practicability and effective of the imaging method were proved by two actual exploration operations in underground. The conclusions show that the inversion imaging method of TEM pseudo wave-field can solve the problem of coal-bed gas hydraulic fracturing in underground.

国家自然科学基金资助项目(41104087)；“十二五”国家科技支撑计划资助项目(2012BAK04B04)；陕西省自然科学基金资助项目(2011JM5003)；

Fan Tao,Cheng Jianyuan,Wang Baoli,et al. Experimental study on imaging method of TEM pseudo wave-field to detect the effect of under- ground coal-bed gas hydraulic fracturing[J]. Journal of China Coal Society,2016,41(7):1762-1768.