Volume 11 Issue 2 ( June )

Hydrocarbon seepage can impact plants via the root system, which absorbs water and minerals for photosynthesis, and cause plant stress, stunted growth, decreased chlorophyll in the leaf, and plant death. This work aimed to define a vegetation stress pattern on a hydrocarbon field in Indonesia by studying vegetation changes with the Landsat-8 operational land imager (OLI), leaf spectral reflectance and physical plant data. The research was carried out in the West Tugu field, Northwest Java Basin, Indonesia. The six vegetation indices were used to analyze the Landsat-8 OLI and leaf spectral reflectance. The results from Landsat-8 OLI showed the normalized difference vegetation index (NDVI) values in the peripheries areas are 0.2 to 0.3 from 0.2 to 0.73, the green difference vegetation index (GDVI) values in the peripheries areas are 0.06 to 0.13 from 0.06 to 0.39, the enhanced normalized difference vegetation index (ENDVI) values in peripheries areas are 0.21 to 0.37 from 0.21 to 0.64, the leaf area index (LAI) values in peripheries areas are 0.1 to 0.5 from 0.1 to 1.1, and the visible atmospherically resistant index (VARI) values in peripheries areas are -0.2 to -0.11 from -0.13 to 0.16, while the structurally insensitive pigment index (SIPI) values in peripheries areas are 1.5 to 2.0 from 1.0 to 2.0. These results were confirmed by spectral reflectance analysis and the physical plants data from the field survey. Based on the research, we concluded that the most stressed vegetation in the oil and gas field occurred on the peripheries, followed in the middle, and that vegetation outside the peripheries areas was greener and healthier.

Keywords: Landsat-8 OLI; micro-seepage; spectral reflectance; vegetation stress; vegetation Index.