the primary properties derived from formation evaluation in tight gas zones are porosity, permeability, gas saturation, the presence and orientation of naturally occurring fractures and the in-situ stress profiles. these properties are determined primarily by electric logs in combination with other logs such as density, neutron, sonic and chemical elemental analysis logs. in the complex pore systems that typify a vast majority of tight gas sand resources, the interpretation of these logs is extremely complicated. the primary focus of the proposal is to adequately account for the complex pore geometry and mineralogy in tight gas sands when interpreting logs to provide not only better estimates of porosity, gas saturation and permeability but also to help in identifying fracture orientation, mechanical properties and in-situ stress variations. initial success has been achieved in developing a relationship to convert log-measured elemental abundances to calculated mineral abundances for tight gas sands in the travis peak, and cotton valley formations of texas and applying the same modeling methods to the frontier formation of wyoming. the authors have developed improvements in their understanding of the fundamental deformation behavior of rocks to develop a method to study the frequency dependent visco-elastic behavior of partially gas-saturated rocks. they have made electrochemical potential measurements on sfe no. 1 cores as a way to better account for shaly sand effects. these are the first such measurements reported for tight gas sands. they have developed some statistical