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 m3d改写一下句意不变

In 2013, Japan carried out the initial marine test in the Nankai Trough, but it was cut short due to an unexpected issue with sedimentation after only 6 days of daily gas production averaging at around 2×104 m3/d.