Method for time lapsed reservoir monitoring using azimuthally sensitive resistivity measurements while drilling

摘要

A method for determining movement of a fluid contact in a subsurface reservoir includes measuring azimuthally sensitive resistivity at a first time from within a wellbore penetrating the subsurface reservoir. A first position of the fluid contact with respect to the wellbore is determined using the azimuthally sensitive resistivity measurements. After a selected time, the measuring azimuthally sensitive resistivity from within a wellbore penetrating the subsurface reservoir is repeated. Movement of the fluid contact from the first position is determined using the repeated azimuthally sensitive resistivity measurements.

主权项

1. A method for determining movement of a fluid contact in a subsurface reservoir, comprising:
measuring downhole, azimuthally sensitive resistivity at a first time from within a wellbore penetrating the subsurface reservoir; determining a first position of the fluid contact with respect to the wellbore using only the downhole, azimuthally sensitive resistivity measurements as measured input parameters; repeating, after a selected time, the measuring downhole, azimuthally sensitive resistivity from within a wellbore penetrating the subsurface reservoir; and determining movement of the fluid contact from the first position using only the repeated downhole, azimuthally sensitive resistivity measurements as measured input parameters and the first position as a determined input parameter.