陕北长6油层组短期基准面旋回与储层非均质性的关系

鄂尔多斯盆地上三叠统延长组长６油层组为一套砂、泥薄互层的组合类型,储层非均质性很强,尤以层间的非均质性最为严重,明显受基准面升、降,和可容纳空间及沉积物供给量的变化影响。通过高分辨率层序地层的短期基准面升、降旋回过程与储集物性关系的分析,建立了６种不同沉积微相的非均质性模式,探讨了向上变深、向上变浅的非对称型和向上变深后复变浅的对称型短期基准面旋回层序对储层非均质性特征的控制作用

CONTROL OF SEQUENCE OF STRATA OVER RESERVOIR HETEROGENEITY OF THE CHANG SIX OIL FORMATION IN NORTHERN SHAANXI

The Chang six oil formation consists of a suite of thin interbedded sandstone and mudstone. Its reservoir heterogeneity is very strong, and especially the seam heterogeneity is the most serious. This is obviously influenced by the base level up and down changings, pore space variation and sediment alimentation. Through analysing the relationship between the course of base level up and down cycles of high resolution sequence strata and the reservoir physical behavior, six heterogeneity models of different sedimental microfacies are founded. This paper discusses the up deepening and shallowening unsymmetric and symmetric short term base level cyclic sequences and their control over the characters of reservoir heterogeneity.