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根据低速渗流理论及松辽盆地嫩江组一段超压盖层的实际资料 ,证实盖层超压形成的本质因素是盖层毛细管孔隙的吸附阻力。在此基础上 ,论证了盖层超压的封闭能力是该盖层超压值的 2倍 ,超压盖层的总封闭能力是盖层底部岩石排替压力与 2倍盖层趄压值之和 ;结合超压盖层的成岩演化史及烃源岩生排烃史研究了超压盖层形成时间及其封烃有效性的评价方法 ,并以松辽盆地大庆长垣以东地区嫩江组一段区域盖层为例 ,研究了该盖层超压对其下部青山口组源岩层生排出的油气封盖的有效性。根据超压盖层的特点 ,论述了超压盖层在油气保存过程中的意义
According to the theory of low velocity seepage and the actual data of overpressure caprock in the first section of Nenjiang Formation in the Songliao Basin, it is verified that the essential factor of cap overpressure formation is the adsorption resistance of capillary pores in cap rock. On this basis, it is demonstrated that the overpressure of the overburden is twice as high as the overpressure of the overburden, and the total sealing ability of the overpressured overburden is the pressure of rock displacement at the bottom of the overburden and the pressure of the overburden at 2 times Based on the diagenetic evolution history of overpressure caprocks and the hydrocarbon generation and expulsion history of source rocks, the formation time of overpressured cap rocks and the assessment method of hydrocarbon sealing efficiency were studied. The first section of Nenjiang Formation, east of Daqing Changyuan, Songliao Basin, Regional caprock as an example to study the validity of this cap overpressure on the cap-sealing of gas from the source rocks of Qingshankou Formation. According to the characteristics of overpressure cap rocks, the significance of overpressure cap rocks in hydrocarbon preservation process is discussed