Abstract: The solution-type secondary pore is one of the most important types of pores in Eogene reservoirs in Jiyang Depression.Especially,it is significant that there are both higher geotemperature and abnormal overpressure in this Depression.The factors that dominate producing and preserving secondary pores in deep reservoirs (>4000m) are disscussed by means of analysing the basic characteristics of the secondary pores,experimenting hydrous pyrolysis with source rocks,suming up the characteristics ofboth temperature and pressure.The conclusion is summarized as follows: (1) The organic acids,which are produced by organicmatter in source rock in maturing process,are advantageous to making secondary pores; (2) The abundant organic matter in sourcerock is beneficial basis to forming secondary pores;(3) The higher geotemperature is conducive to forming secondary pores; (4) The abnormal overpressure is helpful to preserving secondary pores in deep reservoir; (5) The organic disposition between higher geotemperature and abnormal overpressure zone play an important effect on developing secondary pores.On the above basis of study,the advantageoas areas,where the secondary pore zones would be found out,are forecasted preliminarily.It issuggested that the more beneficial region be Liangjialou—Niuzhuang—Liuhu,Lijin—Minfeng and Fanjiabei—Chunhua areas in Donying Depression as well as Bonan and Gubei areas in Zhanhua Depression.

Key words: temperature, pressure, geotemperature gradient, abnormal overpressure, deep reservoirs, secondary pore, Jiyang Depression

摘要： 济阳坳陷地温梯度偏高,存在异常高压带,下第三系深部储层次生孔隙类型丰富.研究认为:(1)受温度作用控制,烃源岩中不同类型的有机质在成熟过程中产生的有机酸有益于次生孔隙的形成;(2)成熟烃源岩丰富的有机质,是形成次生孔隙的有利基础;(3)高地温有利于储层形成次生孔隙;(4)异常高压有助于深部储层次生孔隙的保存;(5)高地温、异常高压带有机的时间、空间配置对深部储层次生孔隙发育程度具有很重要的影响.预测次生孔隙发育区带纵向上,沙三段比沙四段有利,沙四段又较孔店组有利;横向上,东营凹陷梁家楼-牛庄-六户、利津-民丰和樊家北-纯化一带,沾化凹陷渤南和孤北一带为有利地区.

关键词: 温度, 压力, 地温梯度, 异常高压, 深部储层, 次生孔隙, 济阳坳陷