Abstract
Taking the Kumkol oilfield in the South Turgai Basin of Kazakhstan as an example, based on the quantitative statistics of permeability coefficient, grade difference and rush coefficient, the water driving dominant channel of the braided river sandstone, meandering river sandstone and delta sandstone under the same development mode are compared and analyzed, and finally determined water driving degree and remaining oil potential of different types of sandstones. The results show that the permeability heterogeneity of the braided river sandstone is weak and the water driving dominant channel in the reservoir is not developed, so the overall waterflooding and water driving degree is high with small remaining oil potential; in delta sandstone, the permeability heterogeneity is high and water driving dominant channels develop in underwater distributary channel and mouth bar single sand bodies, so the overall waterflooding and water driving degree are low with large remaining oil potential; While in meandering sandstone, the permeability heterogeneity is moderate and water driving dominant channels develop in point bar single sand bodies, the overall waterflooding and water driving degree as well as remaining oil potential are between the braided river sandstone and the meandering sandstone. Under the same development mode, the delta sandstone is the main target of the remaining oil potential tapping in the later stage.
Published Version
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