Dear all,

A sandstone reservoir was drilled with oil based mud with good shows.
Porosity is in the range of 4 to 7 percent and water saturation is also low.
MDT mobilities are less than 1 and estimated permeability is also very low.
Testing the best zone, it flowed water with some hydrocarbon.
MDT hydrocarbon sample was taken in the tested zone.
Reservoir is at irreducible Sw, why it flowed water?

Please reply and thanks.

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