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松辽盆地齐家古龙-三肇凹陷青山口组以上地层发育3套明显的压力体系,其中作为勘探重点的青山口组和嫩江组泥岩超压不仅控制烃类的生成,还对相邻储层具有深远影响.在前人研究基础上,应用热解分析、X射线衍射、镜下鉴定、扫描电镜、铸体薄片鉴定等资料,研究了超压对地质流体活动及成岩作用的影响.结果表明,超压不仅抑制了粘土矿物转化,还抑制了烃类结构的演化.另外,成岩作用中的压实作用、胶结作用对于超压的抑制有明显的响应.超压并不能直接影响溶解作用,而是通过地质流体间接对其产生影响,主要表现为由次生孔隙产生造成的孔隙度增加.
Three obvious pressure systems developed in the Qiaogou-Qingshakou Formation in the Songliao Basin. Three obvious pressure systems were developed in the formations above the Qingshankou Formation in the Sanzhao depression. The overpressure of the mudstone in the Qingshankou and Nenjiang formations, which are the focus of exploration, not only controls hydrocarbon generation, Has a far-reaching impact on the basis of previous studies, the application of pyrolysis analysis, X-ray diffraction, microscopic identification, scanning electron microscopy, the identification of cast thin slices and other data to study the effect of overpressure on geologic fluid activity and diagenesis results show Overpressure not only inhibited the conversion of clay minerals but also inhibited the evolution of hydrocarbon structure.In addition, compaction and cementation in diagenesis significantly responded to the suppression of overpressure.The overpressure did not directly affect the dissolution, But indirectly through the influence of geological fluids, mainly due to the increase of porosity caused by secondary porosity.