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对东营凹陷沙河街组地层水化学研究结果表明:沙河街组地层水为矿化度较高,阴、阳离子分别以Cl-和Na++K+为主的氯化钙型水,rNa/rCl平均值在0.92～1.12之间,rSO4×100/rCl平均值在3.68～5.73之间,rCl—Na/rMg平均值在-0.52～5.37之间;剖面上,沙河街组地层水化学成分和离子比值随深度表现为阶梯式增加型、增加—减小交替型和变化混乱型3种变化类型。平面上,沙河街组矿化度由凹陷边缘向中心递增,并且沙三段—沙一段矿化度高值区主要分布在中央断裂带附近;沙河街组现今地层水总体处于封闭的流体动力环境,但同一地层不同构造单元的地层水的流体动力环境相差较大,油气的聚集和保存条件也相差较大;在地质历史时期流体曾沿中央断裂带由深层向浅层运移,且中央断裂带受大气淋滤水影响较弱,有利于后期油气的聚集和保存。
The formation water chemistry of Shahejie Formation in Dongying Depression shows that the formation water of Shahejie Formation is of high salinity, and the Cl- and Na ++ K + are the main types of calcium chloride-based water. The average rNa / rCl The average value of rSO4 × 100 / rCl is between 3.68 and 5.73, and the average value of rCl-Na / rMg is between -0.52 and 5.37. On the section, the chemical composition and ion ratio With the depth of the performance of the stepped increase, increase - reduce the alternant and chaotic changes of the three types of changes. In the plane, the mineralization degree of Shahejie Formation increases from the margin to the center of the sag, and the high salinity value of the third member of Shahejie Formation is mainly distributed near the central fault zone. Currently, the formation water of Shahejie Formation is in a closed hydrodynamic environment However, the hydrodynamic environment of formation water in different tectonic units in the same stratum differs greatly, and the accumulation and preservation conditions of oil and gas also vary greatly. During the geological history, the fluid migrated from deep to shallow along the central fault zone and the central fault Belt by the impact of atmospheric leaching water is weak, is conducive to the accumulation and preservation of late oil and gas.