Application of borehole transient electromagnetic detection in the test of hydraulic fracturing effect

Hydraulic fracturing technology is widely used in various aspects such as mine rock burst prevention and surrounding rock depressurization, but there has been a lack of efficient and intuitive technology for evaluating the fracturing effectiveness. To solve this problem, a three-component borehole TEM detection method using dynamic source and reception unit was proposed, and detection equipment and supporting construction techniques suitable for construction in hydraulic fracturing holes were developed. Two engineering tests have been carried out in a coal mine. By comparing the processing results of the vertical components of the two detection data before and after fracturing, a pure anomaly field was extracted, and the distribution range of the main cracks was determined. The azimuth center of the body was positioned to complete the spatial three-dimensional imaging display of the fractures. The research shows that the borehole transient electromagnetic three-component detection technology can be combined with underground mine fracturing construction. The distribution of fracturing fluid can be obtained by comparing the detection results before and after fracturing, and then the development of fracturing fractures is analyzed to achieve the purpose of fracturing effect detection and evaluation.