Production profile determination and modification system

A downhole system for facilitating measurement of fluid parameters in a wellbore, comprising:

• a downhole tool, comprising:
• a first portion operable to house a well logging tool;
• and
• a second portion operable to selectively secure a retrievable fluid barrier to a wellbore casing.

A method of profiling and modifying fluid flow within a wellbore, comprising:

• deploying a tool string into a wellbore lined with a casing, the tool string having a retrievable fluid barrier, a logging tool and a downhole tool;
• actuating the downhole tool to secure the fluid barrier within the casing below a first group of perforations in the casing;
• disengaging the downhole tool from the fluid barrier;
• operating the logging tool to detect characteristics of the fluid flowing into the wellbore through the first group of perforations.