Sequence I can be distinguished from the northwest slope to trough basin and is Holocene softy sediments.
层序I，由海槽西北部陆坡可以连续追踪至海槽区域，为全新世松软沉积物。
In some areas of the trough basin, sequence V, which is residual Miocene sediments, deposited beneath the sequence III.
盆地内某些区域，在层序iii之下，还存在层序v，为残留的中新世沉积物。
Xisha trough basin is the advantage oil and gas exploration area of the northern continental slop of the South China Sea.
西沙海槽盆地是南海北部陆坡深水区的有利油气勘探区域。
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