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为了研究泥岩超压不同演化阶段开始及释放深度规律,利用泥岩破裂和愈合机理,定量研究了泥岩超压在不同演化阶段释放深度规律。结果表明,除第一演化阶段超压释放深度约为其开始深度的2.57倍外,其余演化阶段超压释放深度约为其开始深度的2倍。通过研究泥岩超压在不同演化阶段开始与释放深度规律可以预测超压释放次数、目前超压所处的演化阶段和古超压值,还可研究超压源岩的排烃期次和油气聚集及散失次数。以松辽盆地古龙凹陷古11井青山口组泥岩为例,对其超压在不同演化阶段释放深度规律进行了研究,并阐述了其在油气排出和油气保存研究中的意义。
In order to study the initiation and release depth rules of mudstone overpressure in different evolution stages and using the mechanism of mudstone rupture and healing, quantitatively studied the law of release depth of mudstone overpressure in different evolution stages. The results show that except for the over-pressure release depth in the first evolution stage is about 2.57 times of its initial depth, the over-pressure release depth in the other evolution stages is about twice as much as the starting depth. By studying the initiation and release depth rules of mudstone overpressure in different evolution stages, it is possible to predict the number of overpressure release, the current evolution stage of overpressure and paleo overpressure, and to study the stages of hydrocarbon expulsion and hydrocarbon accumulation in overpressured source rocks And the number of casualties. Taking the mudstone of Qingshankou Formation of Paleogene 11 in the Gulong Sag of Songliao Basin as an example, the release depth law of overpressure at different evolution stages was studied, and its significance in the study of hydrocarbon emission and hydrocarbon preservation was expounded.