The objectives of US Geological Survey (USGS) work are to conduct geologic research characterizing tight gas-bearing sequences in the western United States. Additional critical objects are to provide geologic consulting and research support for ongoing Multiwell Experiment (MWX) engineering, petrophysical, log-analysis, and well-testing research. The USGS research during the last few years has been in the Greater Green River, Piceance, and Uinta basins of Wyoming, Colorado, and Utah. However, beginning in FY-87 our efforts have been restricted for the most part to the Greater Green River basin. 16 refs., 20 figs.