The relative compaction trend line is established to determine supercharged shale zone according to the relationship between the depth of shale formation and acoustic slowness.

• 通过声波时差和自然伽马能谱资料分析泥岩裂缝的储存能力，并利用纯泥岩地层的深度与声波时差的关系，建立相对正常压实趋势线，判断泥岩超压层。