The present disclosure describes a method for surveillance of a horizontal well, including: monitoring a first set of measurement data from a pulsed neutron tool and a second set of measurement data from an array tool, wherein: the first set of measurement data indicate a holdup of the second liquid globally inside the horizontal well, and the second set of measurement data show a plurality of velocities measured at a set of corresponding locations inside the horizontal well; and interpolating the first set of measurement data to identify an interface between the first liquid and the second liquid; establish an estimated holdup of the second liquid in the cross-section of the horizontal well; and combining the estimated holdup of the second liquid with velocities measured at locations inside the horizontal well that correspond to the second layer to generate a flow weighted estimate of the second liquid inside the horizontal well.
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