Abstract Natural gas hydrates (NGH) are an unconventional resource that are thought to contain more gas reserves than any other reservoir type. This crystal structure, formed through the combination of gas and water under suitable temperature and pressure conditions, has been evaluated in several research test boreholes around the world, including the North Slope, Alaska. In 2007 the Mt Elbert-1 borehole was drilled to evaluate NGH potential. An extensive well logging program was performed on this well allowing robust interpretation including comparison of evaluation techniques. This paper discusses the petrophysical properties of NGH and their impact on selected well logging (formation evaluation) measurements. These responses are demonstrated on the Mt Elbert-1 test well data. Their detailed petrophysical interpretation delivers lithology evaluation through capture gamma ray spectroscopy; total, free and bound fluid porosity from formation density, neutron porosity and nuclear magnetic resonance in conjunction with resistivity anisotropy and acoustic properties. A comparison of various hydrate saturation evaluation techniques is provided, and the applications of borehole images are also discussed. This paper demonstrates how these formation evaluation techniques provide an effective method of evaluating NGH resources.