东营凹陷古近系沙河街组碎屑岩储集层非均质性与油气意义

从宏观和微观两方面分析了东营凹陷古近系沙河街组碎屑岩储集层的非均质性特征。沙河街组碎屑岩储集砂体类型多样,通过统计分析宏观物性参数,不同成因类型储集砂体的渗透率和孔隙度分布差别较大,其中河流相、（扇）三角洲前缘水下分流河道及河口坝砂体储集质量最好；不同沉积微相的孔隙度基本上均呈正态分布,其中三角洲河口坝砂体及水下分流河道砂体孔隙度峰值较高。非均质参数表明,（扇）三角洲前缘水下分流河道非均质程度最强。通过对各种微观非均质性参数的综合研究,将储集层孔隙结构分为5种类型,其中大孔较粗喉及大孔中细喉为好的储集层,常见于（扇）三角洲水下分流河道砂体下部和河口砂坝主体的中细砂岩中。非均质性研究的结果与油田试油结果对比吻合较好,表明该项研究对下一步油气勘探与后期注水开发具有重要的指导意义。

Heterogeneity of clastic reservoir of the Shahejie Formation of Paleogene in Dongying Sag and its hydrocarbon significance

The reservoir heterogeneity of clastic reservoir of the Shahejie Formation in Dongying Sag is analyzed based on the macro-and micro-petrophysical characteristics. There are various types of the reservoir sandbodies in the Shahejie Formation. Statistic analyses on the macro-petrophysical properties indicate that porosity and permeability with different genetic types are quite different in their distribution. Sandstones of the fluvial facies, subaquaeous distributary channel of(fan)delta-front facies and mouth bar facies are the best reservoirs. The porosity distribution of the different microfacies is generally characterized by a normal distribution. The sandbodies of delta-front mouth bar and subaqueous distributary channel have larger peak value of porosity. Heterogeneity parameters indicate that the heterogeneity of subaqueous distributary channel of(fan)delta-front is the most serious. Synthetic analyses have been made on the various micro heterogeneous parameters and the porosity texture of the reservoir is divided into 5 types. The reservoir with large pore and moderate-thin throats is the best one which is developed in the lower part of subaquaeous dietributary channel of(fan)delta and the medium-fine grained sandbodies of mouth bar. Results of the heterogeneity researches can be correlated with the field testing results quite well. Thus they have significant implications for the further petroleum exploration and water-injection exploitation.