Fluvial facies reservoir architecture and its control over the distribution of oil and water

Key words:  fluvial facies  reservoir architecture  single genetic sand body  abandoned channel  distribution of oil and water

Abstract:

Aimed at the disorderly distribution of oil and water in the former geological maps，reservoir architecture research and the traditional sedimentary microfacies research were compared for the upper member of Guantao formation in Gudao Oilfield. An accurate reservoir architecture of section and plan was established for single genetic sand body by using architectural elements analysis method，and individual reservoir plan maps of the main single sand body were drawn. The control effects of reservoir architecture for oil and water distribution were analyzed. The results show that the vertical as well as planar research seal of the reservoir architecture research is more accurate than the traditional sedimentary microfacies research. The key step of establishing accurate reservoir architecture models is to recognize the single genetic sand body，especially to recognize the single channel sand body, because it can influence the veracity of the section and plan architecture . The spatial arrangement and configuration of reservoir architecture elements control the distribution of oil and water directly. Layered reservoirs may have several oil-water boundaries. The" oil-filled" reservoirs usually form above the inner oil-water boundary, while the M oil in water" reservoirs usually form between the inner and outer oil-water boundary.