Single trip dual zone selective gravel pack

A method for gravel packing dual zones within a wellbore, comprising:

• creating an outer sub-assembly consisting of a washdown assembly, a lower shunt screen assembly, a downhole packer assembly, an upper shunt screen assembly, and a gravel pack assembly stacked in order on top of one another;
• creating an inner sub-assembly consisting of an inner string assembly and gravel pack service tool assembly stacked in order on top of one another, wherein the inner sub-assembly is positioned within the outer sub-assembly;
• running the outer sub-assembly having the inner sub-assembly therein proximate a bottom of a downhole portion of a wellbore;
• setting an uphole packer associated with the gravel pack assembly in an uphole portion of the wellbore and a downhole packer associated with the downhole packer assembly in the downhole portion of the wellbore;
• gravel packing an upper zone of the uphole portion of the wellbore using the upper shunt screen assembly and a lower zone of the downhole portion of the wellbore using the lower shunt screen assembly;
• pulling the gravel pack service tool assembly out of the wellbore thereby isolating the upper zone and the lower zone from each other and the wellbore;
• and
• running an upper completion into the wellbore to open one or both of the upper zone or the lower zone for production.