泥岩超压不同演化阶段开始及释放深度规律及其研究意义

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。

The beginning and release depth of mudstone overpressure in different evolution stages and its implication

The beginning and release depth of mudstone overpressure in different evolution stages have been studied quantitatively by using the mechanism of mudstone break and heal.The result indicates that except the first evolution stage where the release depth of overpressure is about 2.57 times of its beginning depth,other evolution stages have the release depths about 2 times of the beginning depths.This study can help predict the times of overpressure release as well as current evolution stage and ancient overpressure value,and study the terms of hydrocarbon expulsion from overpressure source rock and the times of hydrocarbon accumulation and diffusion.Taking K1qn mudstone in Well Gu11 in Gulong Sag of Songliao Basin as an example,the pattern of overpressure release depth in different evolution stages has been studied,and its implication of hydrocarbon expulsion and preservation is discussed.