Background
Sercel conducted a production QC for a benchmark on marine source technology, involving both conventional impulsive sources and the Gi-Source, to measure their acoustic performance and demonstrate their geophysical benefits. The survey was conducted in a very shallow water area. In this case, the benchmark was provided by the seismic operator; however, Sercel can supply onboard Field Service Engineers (FSE) when required.
Methodology
The QC parameters were validated remotely by our Sercel experts. The graph below shows a small deviation in time between the prediction and the record. This deviation could be attributed to variations in geometry, depth, or pressure, but it is most likely due to a different injection delay for a depth of 5 meters. The user manual recommends an injection delay of 44 ms. However, it seems that in the field, this parameter was set to approximately 37 ms.
![qc data](/sites/default/files/2024-07/scheme.png)
![GI-source underwater](/sites/default/files/styles/img_573/public/2023-06/Sercel_GI-SOURCE_InWater_hr.jpg?itok=k7ZqGEqW)
Conclusions
From this, we can conclude that the GI-Source feature was used properly but could be improved. Additionally, the results included an evaluation of the sensitivity calibration of the Near-Field Hydrophones (NFH) based on accurate modeling of the source output. We also improved the calibration process to enhance sensitivity accuracy, which facilitated the benchmarking of the source technology.