摘要
以胜坨油田三区东营组三段为例,对辫状河储层中隔夹层的层次结构进行了分析。认为在精细油藏描述阶段,隔夹层有砂层组间的隔层、小层间的隔层、单砂层间的隔层及层内的夹层4个层次。不同尺度的隔夹层在岩石类型、发育程度、厚度及展布特征等方面均存在较大差异,导致其对剩余油的控制作用不同。其中,砂层组间的隔层全区稳定分布,厚度较大,对油气能起到完全封堵的作用,而单砂层间的隔层稳定性差,虽也是连片分布,但出现多个砂体连通区,易发生窜流,使纵向非均质性增强。小层间的隔层则介于两者之间。层内夹层则因为东三段地层已精细划分到单砂层,发育程度中等,仅在局部使油水关系复杂。
With the third member of Dongying Formation of Block 3 in Shengtuo oilfield as an example, the hierarchical structure of barrier beds and interbeds in braided river reservoirs are studied. In the phase of fine reservoir description, the barrier beds and interbeds have four hierarchies, including the barrier beds between sand groups, between subzones, between single sand beds, and the interbeds in single sand beds. There are many differences in rock types, development degree, thickness and characteristic in different scales barrier beds and interbeds, which cause different distributions of remaining oil. The barrier beds between sand groups are widely distributed in all the area, and can completely shut off hydrocarbon zone. The barrier beds between single sands have poor stability, and there are many belts of sand body connection in plan, which easily cause crossflow and enhance the vertical heterogeneity. The characteristics of barrier beds between subzones are between these two barrier beds. The interbeds in single sand beds are middle in development degree, and only make complicated the relationship of oil and water in local areas.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2009年第3期378-383,共6页
Natural Gas Geoscience
关键词
辫状河
隔层
夹层
层次结构
Braided river
Barrier beds
Interbeds
Hierarchical structure.
