Study on Remaining Oil Distribution of Single Sand Body in Yan 10 Reservoir in Zhenbei Area, Ordos Basin

Abstract

In yan 10 reservoir of Jurassic in Zhenbei oilfield, there are many small laminations vertically, many casing broken wells, and the water cut rises rapidly. It is necessary to carry out the research on the distribution law of remaining oil in single sand body, so as to effectively guide the development of potential tapping measures. The logging electrical standard of single sand body division is established, the vertical and horizontal contact relationship of single sand body is clarified, and the influence of different contact patterns of single sand body on water breakthrough is studied. The geological model which can accurately reflect the spatial distribution of single sand body is established, and the numerical simulation research is carried out to clarify the distribution characteristics of remaining oil under different single sand body superposition patterns. The vertical superposition pattern of single sand body in yan 10 reservoir in Zhenbei area is mainly separated and isolated, and the horizontal contact relationship is mainly divided into bay and embankment contact. According to the influence of different single sand body styles on water content rise, the water content rise speed of single channel is the fastest, followed by side cutting and docking contact. In terms of the distribution law of remaining oil, the vertical separation type and isolated type of single sand body are rich in remaining oil, the horizontal up cutting type and docking type of single sand body are rich in remaining oil, and the single sand body is rich in remaining oil in the area with imperfect injection production horizon. The distribution rule of remaining oil under the control of single sand body is clear, which can effectively guide the development of potential exploration measures. At the same time, it can be used for reference in fine single sand body remaining oil characterization of similar reservoirs.