COMPARATIVE ANALYSIS OF DEFORMATION PROCESSES AT UNDERGROUND GAS STORAGE FACILITIES

Abstract

The ability to conduct ground and satellite measurements at unique sites, such as underground gas storage facilities (UGSF), has enabled to analyze their behavior over time. The main difference between these facilities is that the first UGSF located on the border with the Moscow region is created in the aquifer, and the second UGSF is located in Saratov region, in the depleted oil and gas condensate deposit. Upon completion of 4 cycles of surveying and geodetic observations, the authors have drawn up the graphs and carried out the comparative analysis of the obtained results. It is shown that UGSF created in the aquifer is characterized mainly by uplifts and subsidences over the entire area of the facility, and the exploitation of the UGSF created on the basis of depleted deposit results also in local deformations of the earth's surface in the fault zones. As a result of the analysis of combined satellite (GPS) and ground (high-precision geometric leveling of class II) observations, it was proposed to use groundbased re-tacheometric survey in the form of construction of local trilateration networks to measure horizontal displacements in fault zones.