Deepest deep-hole integrated geophysical observation system has successfully installed

摘要

cqvip:On August 26, 2019, the deep-hole integrated geophysical observation system of the long-term observatory of the Chinese Continental Scientific Drilling project (CCSD) was successfully placed into the deep-hole and received signals in real time (Fig. 1). The deep-hole geophysical observation system was installed to expected design depth: two sets of seismographs and three sets of geotherms were placed at the main hole of 1498 m, 2367 m, 3006 m and 3499 m respectively. The temperature of the deepest installation position is up to 98 ℃, the pressure is up to 35 MPa, and the minimum inner diameter is only 175 mm. It is the deepest deep-hole geophysical observation system in China (Fig. 2).