Abstract: The effect of fluid-rock interaction on porosity of reservoir rocks in Tertiary System of Dongying Sag has been analyzed in the paper.The results indicate:(1)organic-inorganic interaction and the amount of organic acid and CO₂ produced in the action in source rock-pore fluid system are the key factor of the formation of porosityin sandstone; (2)the dissolution of carbonate and aluminosilicate are the important fluid-rock interactions to control porosity in sandstone; (3)the amount of carbonate in mudrock has an important influence on the scale of the formation of porosity in sandstone; (4)the abilities of inflow and outflow of fluid during fluid-rock interaction determines the development of porosity in sandstone.Due to the influences of the geological and geochemical factors and fluid-rock interaction,the three regional porous zones and three regional cemented zones are formed in the profile in Dongying Sag.

Key words: fluid-rock interaction, porosity, Tertiary System, Dongying Sag

摘要： 东营凹陷第三系流体-岩石相互作用对储集孔隙发育有影响.研究结果表明(1)泥岩(烃源岩)-孔隙流体系统的有机/无机相互作用及其产生的有机酸和CO₂的数量是砂岩层孔隙形成和发育的关键;(2)砂岩层中的碳酸盐和铝硅酸盐矿物的溶解作用,是控制砂层孔隙形成的主要流体/岩石相互作用;(3)泥岩中碳酸盐含量大小影响着砂岩孔隙的发育规模;(4)流体-岩石相互作用过程中的流体输入和输出能力控制着砂岩孔隙的发育强度和规模.在地质-地球化学因素和流体-岩石相互作用影响下,东营凹陷从上往下有序地发育三个区域性的致密带与三个孔隙带相间.

关键词: 流体-岩石相互作用, 孔隙发育, 第三系, 东营凹陷