盘古梁长6油层组中期基准面旋回沉积-储层特征

Features of sediment and reservoir in middle base-level cycles of Chang 6 reservoir set in Panguliang Oilfield

目的明确盘古梁油田长6油层组各中期基准旋回中地层的沉积特征,储层的分布和物性的变化,为生产提供科学依据。方法运用层序地层学、沉积学等理论,通过各级别基准面、湖泛面的识别和短期旋回叠加样式的认知,多井对比闭合,对长6油层组进行中期旋回的划分对比。结果长6油层组可划分为7个中期基准旋回,受A/S值控制,7个中期旋回的短期旋回叠加样式,沉积相和相组合特征,砂体纵向展布、平面连片程度,储层的物性和非均质性呈现一定的递变规律。结论基准旋回对地层的沉积特征、储层物性的变化起重要的控制作用。

Aim To give scientific middle base-level cycles of Chang 6 supports to the production reservoir set in Panguliang by studying the features of strata and reservoir in Oilfield. Methods Guided by high-resolution sequence stratigraphy and sedimentology, on the basis of identification of multi-order base-level, recognition of stacking patterns of short-time cycles and correlation of multi-wells, Chang 6 reservoir can be classified into several middle-term base-level cycles, and the characteristic of strata and reservoir in different cycles are also studied. Results Seven middle-term base-level cycles can be divided in Chang 6 reservoir, and under control of the variation of ratio between containing space and sediment alimentation, the stacking patterns of short-time cycles; the faceis sequence and facies assemblage; the distribution of sandbody and areal heterogeneity of the reservoir all exist in both in horizon and vertical; the physical properties grading order in each middle-time base-level cycle. Conclusion The base-level sequence plays an important role in the sedimentary characteristic of the strata and properties of reservoir.