ANALYSIS OF SOIL DEFORMATION DUE TO OIL AND GAS EXPLORATION AND MICRO HYDROCARBONS SEEPAGE IN NGASEM DISTRICT, BOJONEGORO REGENCY Husein Sadewa Wiguna (a*), Noorlaila Hayati (a)
a) Faculty of Planning and Earth Civil Engineering, Institut Teknologi Sepuluh November
*sadewawigunahusein[at]gmail.com
Abstract
Land subsidence is the result of the extraction of fluids in the rock pores from sediment compression. The decrease occurred due to exploitation of oil and gas wells in the area which took and caused sediment compression to decrease. In addition to the result of excessive hydrocarbon extraction, hydrocarbon micro seepage can also trigger anomalies at ground level. This anomaly is due to the large number of hydrocarbons in the reservoir and the dynamic accumulation of oil and gas, causing the absence of a perfect seal rock, so this study aims to determine the average rate of subsidence in Ngasem District and analyze the relationship between soil deformation and exploration activities. oil and gas and hydrocarbon micro-seepage.
The method used in this study uses the InSAR Time Series method with LiCSAR Sentinel 1 SLC data and Generic Atmospheric Corrction Online Service (GACOS) used from 2014 to 2022 for deformation data. Meanwhile for the distribution map of the hydrobarone micro seepage obtained from Exxon Mobil and the East Java Basin Exploration Well obtained from the Ministry of Energy and Mineral Resources.
The results showed that the deformation of the soil surface in Ngasem District was very diverse due to the geological structure, exploration wells and the potential for hydrocarbon micro seepage. From the results of deformation processing in the Ngasem District area, the highest speed of increase in the research area is at 77mm/year while the largest decrease is at -85 mm/year. Exxon Mobile^s exploration wells have a subsidence of -30mm/year while the potential for hydrocarbon micro seepage has increased by 60mm/year. From the results of the analysis of the decline that occurred in exploration wells due to the exploitation of oil and gas
