Funding for this research was provided by:
National Natural Science Foundation of China (41502345)
Research Foundation of Key Laboratory of Deep Geodrilling Technology, Ministry of Land and Resources (KF201810)
Article History
Received: 23 July 2019
Accepted: 9 October 2019
First Online: 11 October 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.