1. A method comprising: obtaining a borehole image deriving from a downhole tool in a wellbore of a geological formation; identifying one or more patches that correspond to sediment particles on the fullbore image; computing one or more characteristics for each of the one or more patches, wherein the one or more characteristics comprise long/short axis length, size, roundness, sphericity, orientation, or some combination thereof; and displaying a visual representation for each of the one or more characteristics.