将这句话 Japan conducted the first marine test in 2013 in the Nankai Trough which was terminated by an abrupt sanding problem on 6 d with a daily gas production rate of about 2×104 m3d22 In 2017 Japan con

In 2013, Japan performed its inaugural marine test in the Nankai Trough, but it was unexpectedly halted on the 6th day due to a sanding issue. The test had been producing roughly 2×104 m3/d of gas. Four years later, Japan conducted a second test in the same location.