摘要
本文以东营凹陷现河庄油田河31断块区沙一段、沙二段地层为研究对象,划分出了16种沉积微相类型,详细描述了主要沉积微相砂体特征,阐明了沉积微相分布规律和时空演化特征.研究区内主要为三角洲和湖泊相沉积,随着湖平面的变化和沉积物供给的变化,三角洲由东北向西南不断推进或收缩.在纵向上可明显划分二个旋回,即沙二段从早到晚由浅湖演变为三角洲平原,沙一段从早到晚由浅湖演变为三角洲前缘.并通过相控模型的研究,定量地讨论了沉积微相对砂体(储层)发育程度、储层物性及储层单层内非均质性的控制,研究表明分流河道、边滩和河口坝沉积微相为研究区内最有利的相带.并指出砂体的沉积微相特征从微观上和宏观上控制了剩余油的分布特征,这为精细油藏描述中的储层模型建立提供了重要的基础资料.
Through detailed study of the first and second members of the Shahejie Formation of the He - 31 Block in the Xianhezhuang Oilfield, 16 sedimentary microfacies types are reconized and their characteristics are described. Their distribution and evolution are also discussed. In the study area, delta and lacustrine sediments are developed, and with the change of lake level and sediment supplies, the delta was pushed forward or backward incessantly from northeast to southwest. Two sedimentary cycles are identified. One represents evolution from shallow lake to delta plain in the second member of the Shahejie Formation, and another from shallow lake to delta front in the first member of the Shahejie Formation. The control of the sedimentary microfacies on sandbodies development, reservoir quality and intrabed heterogeneity of reservoir beds are illustrated quantitatively. The study shows that distributary channels, point bars and river mouth bars are the most favorable sedimentary facies. The characteristics of sedimentary microfacies control the macroscopic and microscopic distribution of residual oil and these research results are very useful for constructing the model of the fine reservoir description.
出处
《古地理学报》
CAS
CSCD
1999年第2期36-45,共10页
Journal of Palaeogeography：Chinese Edition
关键词
油藏描述
沉积擞相
单层内非均质性
砂层组
fine reservoir description, sedimentary microfacies types, intrabed heterogeneity of reservoir
