Cavendish 3D Reprocessing Project
2,736 km2 of 3D multiclient seismic data
Targeted geophysical solutions for accurate seismic imaging in the North Sea.
Wavefield separation technique for the deghosting of over-under or dual-measurement marine streamer data
Our optimal deghosting (ODG) technique removes receiver-side ghost notches in the seismic bandwidth, particularly for deep-towed cables. It boosts frequency content at both the high and low ends of the spectrum, providing you with tailored broadband seismic data for your exploration needs. Whether ODG is used on single- or multimeasurement data, it produces a fully deghosted seismic dataset with an optimal S/N ratio and improved frequency content. This technique is ideal for structural imaging, inversion, and rock property characterization.
ODG was originally developed for combining pressure wavefields acquired by combinations of hydrophone-only streamers from over-under or similar acquisition types. ODG can also be applied to combine pressure (P) and vertical velocity (Z) data recorded by multimeasurement marine streamers. In both cases, ODG removes the receiver-side ghost and extends the recorded bandwidth of your data at both the low and high ends of the frequency spectrum.
Our optimal deghosting improves the signal-to-noise (S/N) ratio of your marine streamer data, especially at lower frequencies. To accomplish this, it removes the phase distortion generated by the receiver-side ghost by dephasing the wavelet. It then sums the two dephased measurements and deterministically shapes the data to obtain the upgoing wavefield. ODG can also be used on the pressure and velocity data in combination with PZ summation. The result is a hybrid deghosting process that is robust to rough sea conditions and prevents excessive noise from contaminating the solution at low frequencies. This approach can be extended to a 2.5D solution when used on datasets with a wide marine spread.