Abstract:

Practices at home and abroad have proved that carbon dioxide flooding is one of the most successful technologies to enhance oil recovery. Due to the high flowability of gas, gas channeling is an important problem in the process of gas injection. The technology of single sand body anatomy is a very effective method to characterize reservoir heterogeneity. In this paper, based on the dense well data and guided by the high resolution sequence stratigraphy theory, using hierarchy interface analysis technology, we studied the interlayer distribution patterns and sand bodies stacked patterns to anatomize single genetic sand body size distribution and morphology in three-dimensional space. Meanwhile, we established physical properties standards of high permeability belt to describe its distribution zone and to predict gas channeling direction and magnitude. In addition, on the base of single sand body anatomy and gas channeling evaluation, we built a set of technology process which was applied to single sand body anatomy in the process of gas flooding. This technology can scientifically solve the problem of gas channeling, and provide reference for reservoir heterogeneity research methods.

Key words: gas flooding reservoir, single sand body, high resolution sequence stratigraphy, fine description, high permeability belt