【摘要】 歧口凹陷是黄骅坳陷中主要的第三系富油气凹陷，下第三系、上第三系和第四系厚逾万米。在研究该凹陷深层（埋深３５００ｍ以下的沙三段至沙一段和部分东营组）压力特征的基础上，选取地层埋深、孔隙压力和毛管压力这３项主要参数，应用盆地模拟技术，恢复了该凹陷深层４套目的层（沙三段，沙二段，沙一段下部，沙一段中上部）的流体势场演化史。结果表明：４套目的层的高流体势区与凹陷的生烃中心基本一致；沙三段、沙二段和沙一段下部都存在３个继承性发展的油气汇聚流指向区（张５井—张巨河一带，周清庄—王徐庄一带，港深１井—港深３井一带），沙一段中上部存在３个高流体势区，其间分布２个低流体势地带（港深１井—马棚口—歧口—张巨河一带，张巨河—港深５１井—港深２６井一带）。这３个油气汇聚流指向区和２个低流体势地带是油气聚集的有利场所，高流体势区内被泥岩包围的重力流砂体也应是有利勘探目标，在该凹陷的深层勘探中应重视。图４参４（王孝陵摘更多还原

【Abstract】 In Huanghua depression, Qikou sag is the important rich hydrocarbonbearing sag of Tertiary, in which the total thickness of Lower Tertiary, Upper Tertiary and Quaternary formations is more than 10,000m. Deep formations which are below 3,500m include Shasan Member(Es3), Sha’er Member (Es2), Shayi Member (Es1) and part Dongying Formation (Ed). Based on the study of pressure characteristics of these deep formations and chosen elaborately burial depth, porosity fluid pressure and capillary pressure as parameters, this paper rebuilds the evolution history of fluid potential fields of four studied formations, namely Es3, Es2, Es31 and Es1+21, by basinmodeling technology. The results suggest that: the common higher fluids potential area of the four formations is consistent with the center of source rock in the sag; Es3, Es2, and Es31 have three inherited potential pool zones respectively (one along Well Zhang 5Zhangjuhe, one along ZhouqingzhuangWangxuzhuang, another along Well Gangshen 1Well Gangshen 3). There are three higher oil potential zones in Es1+21, which alternate with two lower potential zones (Well Gangshen 1MapengkouQikouZhangjuhe, ZhangjuheWell Gangshen 51Well Gangshen 26). The three inherited potential pool zones and two lower potential zones are available accumulation area for oil and gas; the sand bodies encircled by shale in the higher fluids potential areas may be perspective exploration areas in deep formation.更多还原