The Leaf Area Index (LAI) is an important algorithm for studying the health status of vegetation. In the study, the impact of hydrocarbon micro-seepage on vegetation in Ugwueme, South-Eastern Nigeria was investigated using the LAI image classification approach. Landsat TM 1996, ETM+ 2006, and OLI 2016, satellite images which were downloaded from the United States Geological Survey (USGS) portal, were used to classify various LAI maps as low, moderate, and high classes. The spatial-temporal analysis revealed that the low, moderate, and high LAI density classification changed from 41.24 km² (50.43%), 33.98 km² (41.54%), and 6.56 km² (8.02%) in 1996 to 23.70 km² (28.98%), 29.48 km² (36.04%), and 28.60 km² (34.97%) in 2006, and to 38.23 km² (46.74%), 27.54 km² (33.68%), and 16.01 km² (19.58%) in 2016. The stimulation analysis shows that by 2030 (the 14-year planning period), the low, moderate, and high LAI density classifications will be 8.86 km² (10.82%), 24.28 km² (29.70%), and 48.63 km² (59.46%). The study shows that LAI is an important algorithm that can effectively be used to study the health status of vegetation in an ecosystem.