Shenzhen Fuyong Petrol Station Project

Last update time : 03/02/2018

Author : zhang jie

Testing Purpose

The stratum is differentiated by stratum resistivity according to composed minerals, particle sizes and states. Stratum and subsurface structure are distinguished in accordance with water content and contents of different materials. In this way, the oil leakage pollution of petrol station can be detected, and the polluted range can be determined according to the ground resistivity state of the stratum and pipelines relative to the polluted site. For some pollution like LNAPL pollution source, there is no obvious difference between the original electrical property and stratum. Therefore, other geophysical detection methods are needed as auxiliary. The ERT and the GPR are jointly used to more precisely locate pollution situations.

Test Methods

1. Work configuration and results show

The work is located at XX Petrol Station. A total of one measuring line has been detected by two methods: high density electrical resistivity tomography (ERT) and ground penetrating radar (GPR). The relevant measuring position is shown in the Figure 1. The two methods is measured in an opposite direction.

Figure 2 is a picture of the GPR-1 ground penetrating radar measuring result, highlighted relatively higher reflectivity and stronger amplitudes of this survey line by special filtering. In the picture, the purple box represents highlights of relatively higher reflectivity and stronger amplitudes. This item depicts the reflections of potential oils which have a phenomenon of high reflectivity and strong amplitudes of electromagnetic waves. The electromagnetic waves reflected from this region show signals similar to mosaic in strata, which can be speculated as that this region might be a stratum with relatively higher porosities and is able to gather pollutants. While the yellow round box is electromagnetic wave diffraction reflection of the pipelines.

Figure 3 is a picture of the ERT-1 ground resistivity tomography cross-section measuring result. The measuring results of this survey line are similar with that of the GPR-1 parallel measuring. The abnormal positions are also identical. In the picture, an extremely low resistivity shows up at the location of the oil groove, which can be speculated as a reflection of the mental oil groove. There is an obvious abnormal area at the middle of the ERT resistivity survey line, and should be related to the strong reflection signals of GPR. The correlation with pollution potential is not ruled out. It is suggested to use soil and underground water samples to verify.

Real map

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Last update time 03/02/2018

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