Monitoring of Vegetation Cover during the Development of Oil and Gas Fields According to the Landsat Multispectral Survey Data

About the authors:

Andrei V. Soromotin, Dr. Sci. (Biol.), Director of the Research Institute of Ecology and Resource Natural Management, University of Tyumen; a.v.soromotin@utmn.ru

Leya V. Brodt, Master Student, “Geoecology of Oil and Gas Producing Regions” Program, University of Tyumen; leya.brodt@mail.ru

Abstract:

This article explains the possibility of using different in time digital satellite images to assess the state of the natural environment in the areas of oil and gas production in the subtundra forests of Western Siberia. The authors present the algorithm and results of calculations of the normalized difference vegetation index (NDVI) based on the data of the red (0.6-0.7 μm) and near infrared (0.7-1.0 μm) ranges of the Landsat 5,7 and 8 images in the Urengoy oil and gas condensate field at various stages of development. The means and methods for analysis include the ArcGIS 10.0 software package with the selection of different types of surface (for thematic interpretation) and the ENVI 4.8 PC for calculating the index.

The examples of two key sites show the territorial and temporal dynamics of vegetation cover in 2001-2013. The authors prove that the maximum negative impact happens at the stage of constructing infrastructure facilities primarily due to deforestation. Natural landscapes are covered with mineral soil, the soil cover is mineralized. After the construction’s completion, the restoration of the vegetation cover begins due to the overgrowing of grassy and shrubby vegetation of mineralized surfaces and sandy debris. When studying the scale and rate of degradation-reduction processes in the vegetation cover for man-caused impacts for correct comparisons, it is necessary to calculate the weighted average NDVI values (for selected types of surfaces). The obtained values for the types of the studied surfaces can be used to analyze the vegetation cover in the forest-tundra zone of Western Siberia. The values of the normalized relative vegetation index are in a positive logarithmic dependence of the strong degree on the forest cover of the studied territory.

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