The analysis presented in this manuscript validates the one-dimensional compositional reservoir simulator (CRSIM-1D). CRSIM-1D was developed at the Morgantown Energy Technology Center (METC), and is the first stage of an ongoing investigation of methods for increasing sweep efficiency of miscible EOR carbon dioxide (CO/sub 2/) floods. After its development, the simulator was validated to (1) ensure reliable predictions, (2) understand the sensitivity of input parameters, and (3) identify stability limitations of the code. The results from this study are presented in this report. The first part of this report summarized the results from the comparison of predictions from CRSIM-1D with both experimental data and the predictions from simulators. Four problems from the literature were examined: (1) 3-component oil displaced by a rich gas using single-point upstream weighting, (2) 3-component oil displaced by a rich gas using two-point upstream weighting, (3) 3-component oil displaced by a lean gas, and (4) 15-component oil displaced by CO/sub 2/. In all cases, the results from CRSIM-1D compare well with the results from the literature. Additionally, this report discusses the sensitivity of CRSIM-1D with regard to computational and physical variables. Sensitivities were evaluated for a wide range of physical variables (injection rate, porosity, etc.) and computational variables (time step size and grid size). Part of this evaluation compares CRSIM-1D's predictions to exact solutions that exist for simple problems such as incompressible immiscible floods. These comparisons should provide potential users with insight into the accuracy of predictions from CRSIM-1D. 18 refs., 15 tabs.