We apply seismic geomorphology techniques to quantify morphometrics of a Neogene channel system in Bohai Bay, China. The primary goals of this study are to trace and understand the shapes of complex meander channels toward the development of sedimentary models of channel distribution. First, 11 seismic geometrical attributes were extracted to provide large quantities of morphometric data on the channel plan-view images of four fluvial phases. These data were then coanalyzed to yield the desired five morphometric measures: channel width, meander-belt width, meander length, meander-arc height, and sinuosity. Finally, the relationships, if any, among the five geometric measures were assessed to understand channel reservoir distribution in the study area. A bar graph of sinuosity shows three types of dominant grain size transported by the flow in the channel. A cumulative probability curve of channel width helps to estimate the actual reservoir size. Crossplot analyses reveal relationships between pairs of channel morphometric parameters, which in turn provide the key constraints on channel variability for reservoir modeling and flow simulation in the Lower Minghuazhen Formation, Laizhouwan subbasin, Bohai Bay.