The overall objective of this work is to develop novel diagnostic tools for predicting, monitoring, and optimizing shale gas production. There are three primary objectives of this project. First, to field-deploy our gas isotope spectrometer for real time measuring carbon and duterim isotope ratios of nature gas; second, to develop a user friendly interpretive tool to quantify the remaining gas potential, amount of free gas and absorbed gas; and third, to integrate with other field operational data through our industrial partners and to rationalize our results.