大量甲烷、氢氧化物存在于一定深度的海洋下的沉积物内，因其具有挥发性，易与旋转取芯过程中侵入的气体混合，若不用静水压力能密封的取芯筒，取真实的岩芯是不可能的。DSDP生产了一套绳索回收压力取芯筒，它可以与标准的旋转取芯筒更换，可取7．8m长的岩芯，最大耐压33．8MPa A large amount of methane and hydroxide exist in the sediments under a certain depth of the ocean. Because of their volatility, they are easy to mix with gas invading during rotating coring. If the hydrostatic pressure can not be used to seal the core barrel, Core is impossible. DSDP produces a rope recovery pressure coring cartridge that can be exchanged with a standard rotating coring cartridge, preferably 7.8m long core, with a maximum pressure of 33.8MPa