中文摘要：

基于实际测试资料，统计分析了东濮凹陷西部斜坡带沙河街组油田水的水型、矿化度、盐类离子组分和化学系数的纵、横向变化特征，并探讨了油田水特征对油气聚集与保存的指示作用。研究表明，研究区油田水以CaCl2型为主；矿化度随埋深增大而增大，Ⅱ台阶发育高矿化度区；常规离子组成中阳离子为Na^＋ ＋K^＋、Ca^2＋、Mg^2＋；阴离子为C1^-、SO4^2-、HCO3^-，并以Na^＋＋K^＋和Cl^-占绝对优势，在深层高矿化度区存在阳离子交替吸附现象；由浅至深、自Ⅲ台阶到Ⅰ台阶，钠氯系数、脱硫系数、碳酸盐平衡系数和钠钙系数呈减小趋势，而变质系数和钙镁系数则逐渐增大；油田水分布特征指示着研究区深层的油气保存条件优于浅层，从西部斜坡带顶部到洼陷中心油气保存条件越来越好，Ⅱ台阶是重要的油气聚集区带与勘探对象。

英文摘要：

As an important component of reservoir fluids, oilfield water is tied up with petroleum formation and distribution. Based on practical test data, this paper discusses the vertical and lateral characterstics of oilfield water type, salinity, salt-ionic constituent and chemical coefficient in the western slope belt of Dongpu Depression and its significance for petroleum accumulation and preservation. The study results show that the type of oilfield water in the area is prodominantly CaCl2 with its salinity increasing with burial-depth , while the second step has the highest salinity. The general ions are composed of cations such as Na^＋ ＋K^＋ , Ca^2＋ , Mg^2＋ and anions as Cl^- , SO4^2-, HCO3^- accompanied with high contents of Na^＋ ＋K^＋ and Cl^-; and cations alternation adsorption is found in the deep stratum. From the third step to the first step, the coefficients of Na/Cl, Na/Ca, desulfidation and carbonate balance decrease with burial-depth, whereas that of metamorphism and Ca/Mg increases. The characteristics of oilfield water distribution indicate that the deeper petroleum preservation is superior to that in the lower part, the depocenter is better than the slope belt. It is suggested that the second step should be the important area for petroleum accumulation and hydrocarbon exploration.