Abstract
Taking the Um7 meandering river complex sandstone reservoir of Bohai Bay C oilfield as an example, the interlayer type is defined according to the interlayer lithology and sedimentary genesis, and the identification mode of different types of interlayer is established, and the interlayer comparison of the whole area is carried out by using this mode. The results show that the interlayer can be further defined as the stable distributed interlayer and the randomly distributed interlayer according to the morphology of the interlayer. The distribution characteristics of the two types of interlayers are characterized by the well-to-well comparison method and the data analysis method, and the three-dimensional characterization is carried out. The results more closely reflect the spatial distribution of the interlayer, but also are closer to the underground real situation.
Highlights
Interlayer is one of the main reasons for the heterogeneity of fluid flow in continental reservoirs [1] [2] [3] [4] [5]
Taking the Um7 meandering river complex sandstone reservoir of Bohai Bay C oilfield as an example, the interlayer type is defined according to the interlayer lithology and sedimentary genesis, and the identification mode of different types of interlayer is established, and the interlayer comparison of the whole area is carried out by using this mode
According to the well logging identification and statistics in the well, the mudstone interlayer of the floodplain in the Um7 sand body accounts for 70% of the total mudstone interlayer, the lateral sedimentary mudstone accounts for 25%, and the other type of interlayer accounts for 5%
Summary
Interlayer is one of the main reasons for the heterogeneity of fluid flow in continental reservoirs [1] [2] [3] [4] [5]. The different types of interlayer have been divided according to the distribution characteristics and stability of the interlayer and finely characterized for all kinds of interlayers by Wang Yanzhong, Zhang Shangfeng, Zhang Guoyi, etc. The single sand channels inside the composite sand body are cut and stacked and the distribution characteristics of the interlayer are complex. According to lithology, it is divided into argillaceous interlayer, calcareous interlayer, and physical interlayer composed of poor physical sandstone or argillaceous sandstone. According to the characteristics of interlayer distribution, interactive method and stochastic simulation method are used for three-dimensional modeling of the research results. This study improves the accuracy of the interlayer characterization and makes up for the deficiencies in previous research and modeling
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