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以探井泥岩压实曲线为基础，对陕甘宁盆地陕北斜坡延长组泥岩压实特征进行了综合研究．结果表明，研究区正常压实趋势明显且一致性较好．欠压实现象普遍发育于长４＋５及长６油层组，保持压实与排水平衡的最小声波时差为２２５μｓ／ｍ．上覆地层遭受的剥蚀量达１８００～２５００ｍ，泥岩的欠压实成为本区油气运移的主要动力之一．
Based on the compaction curves of muddy rocks in exploration well, the compaction characteristics of mudstone in Yanchang Formation of Shanbei-Gansu-Ningxia Basin was comprehensively studied. The results show that there is a clear and consistent normal compaction trend in the study area. Undercompression, as generally developed in the Chang 4 + 5 and Chang 6 reservoirs, has a minimum acoustic time difference of 225 μs / m to maintain the compaction and drainage balance. The amount of denudation suffered by the overburden reached 1800-2500 m, and the under-compaction of mudstone became one of the major driving forces for the migration of oil and gas in this area.