Time-Lapse EarthImager™ Module

The optional Time Lapse Inversion module for EarthImager™ 2D and EarthImage™ 3D is used for in-situ monitoring applications.

Our Time-Lapse Module takes a base (or baseline, background) resistivity data set to establish a reference model. Then, the survey is repeated during the monitoring period with the same command file as the one used in the base survey. Our Time Lapse Inversion algorithm uses the base survey data and resistivity model to invert the difference between the monitor and base data sets, resulting in faster convergence and greater sensitivity to small subsurface changes. This cancels out coherent inversion anomalies in the different images and focuses on the changes occurring in the subsurface over time.

The time-lapse inversion may be carried out in two different ways depending on the input type. Difference inversion accepts two raw data files (STG) as inputs. This compares before and after images, while time-lapse inversion focuses on the changes in resistivity from the base data inversion. A batch mode is available that inverts a list of time-lapse data sets. 

Common Use Cases:

• Monitoring potential leakage from landfills, dams, and underground storage tanks

• Fracture tracing

• Tracking environmental remediation progress

• Mapping groundwater recharge

• Infiltration studies

• Intertidal effects on recharge zones along coastlines.

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