Claudio Bagaini

Acquisition and Processing of Dithered Vibroseis Data: A Case History

We present a 2D and a 3D case history of acquisition and processing based on a simultaneous vibroseis acquisition technique we call dithered vibroseis acquisition. This technique is designed to achieve high productivity whilst maintaining the prestack amplitude fidelity required for beyondimaging applications of the seismic exploration method. A land seismic acquisition system with a very large channel count was used to acquire the data for the 3D example. We compare the processing results obtained with conventionally acquired datasets and those obtained with the dithered datasets using three different processing routes. We observe that the poststack results are not substantially deteriorated using this high productivity acquisition technique, particularly in the case of the 3D example, even if the standard processing route is adopted. However, the prestack separated data are significantly better if the processing route that includes algorithms specifically designed for a dithered dataset is adopted.

Acquisition and Processing of Multiple-simultaneous-source Data

Land acquisition has some significant advantages over its marine counterpart with respect to simultaneous source data. In particular, it is practical to employ relatively large numbers of sources, and these sources do not have the constraints implicit in the continuous motion that is an inherent feature of towed-marine acquisition. The large channel counts available with modern land recording systems allow the sources to be spread over a significant area, and modern control systems allow complex rules to be used to determine optimum firing patterns dynamically, in order to maximize efficiency whilst meeting whatever constraints are necessary to ensure good data quality.