Abnormal gas concentration is correlative withabnormal pore fluid pressure, and there is also certain correlation between abnor-mal pore fluid pressure and acoustic transit time.

• 经研究，异常含气浓度与异常孔隙流体压力之间存在相关性，而异常孔隙流体压力又与声波时差之间存在相关性，且这种相关性早有定量描述。