Depth positioning using gamma-ray correlation and downhole parameter differential

A method for determining the location of a tubular string or downhole component in a wellbore including placing a tubular string (315) into a wellbore (310) having at least one radioactive source (400), the tubular string having a depth measurement module (102) and obtaining a plurality of downhole parameter measurements, wherein at least one downhole parameter is a function of depth. The method also includes obtaining a plurality of radiation intensity measurements and determining a length change, L ” , of the tubular string in the wellbore utilized in order to obtain the plurality of downhole parameter measurements and the plurality of radiation intensity measurements. The method also includes determining the location of the depth measurement module in the wellbore based on a correlation of the plurality of downhole parameter measurements, the plurality of radiation intensity measurements, and the length change L ” of the tubular string in the wellbore.