Investigation of Underground Hydrocarbon Leakage using Ground Penetrating Radar

6th Asian Physics Symposium

Srigutomo, Wahyu^1 ; Trimadona^1 ; Agustine, Eleonora^2

Physics of Earth and Complex System, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia^1

Geophysics Department, Faculty of Mathematics and Natural Sciences, Padjajaran University, Indonesia^2

关键词: Dense non-aqueous phase liquids;    Electrical conductivity;    Ground Penetrating Radar;    Ground penetrating radar (GPR);    Hydrocarbon contamination;    Hydrocarbon leakage;    Hydrocarbon spills;    Light non-aqueous phase liquids;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012137/pdf
DOI  :  10.1088/1742-6596/739/1/012137

来源: IOP

【 摘 要 】

Ground Penetrating Radar (GPR) survey was carried out in several petroleum plants to investigate hydrocarbon contamination beneath the surface. The hydrocarbon spills are generally recognized as Light Non-Aqueous Phase Liquids (LNAPL) if the plume of leakage is distributed in the capillary fringe above the water table and as Dense Non-Aqueous Phase Liquids (DNAPL) if it is below the water table. GPR antennas of 200 MHz and 400 MHz were deployed to obtain clear radargrams until 4 m deep. In general, the interpreted radargram sections indicate the presence of surface concrete layer, the compacted silty soill followed by sand layer and the original clayey soil as well as the water table. The presence of hydrocarbon plumes are identified as shadow zones (radar velocity and intensity contrasts) in the radargram that blur the layering pattern with different intensity of reflected signal. Based on our results, the characteristic of the shadow zones in the radargram is controlled by several factors: types of hydrocarbon (fresh or bio-degraded), water moisture in the soil, and clay content which contribute variation in electrical conductivity and dielectric constants of the soil.