Schlumberger

TRISOR Acoustic Source Control Element

Overview Library

Advanced in-sea source control with borehole seismic QC

As a component of the Q-Borehole integrated borehole seismic system, the TRISOR acoustic source control element delivers the highly predictable and consistent seismic source required for superior-quality signals as petroleum exploration advances to deeper wells and more complex formations. Based on the WesternGeco TRISOR marine seismic source controller, this TRISOR controller for borehole seismic operations provides the same stable, noise-free digital signatures and calibrated amplitude through advanced QC.

Direct digital interface for seamless acquisition

The in-sea electronics that control each gun are connected by a proprietary ruggedized ethernet cable for digital communication with the surface acquisition system of the VSI versatile seismic imager. This configuration avoids the corruption that may occur to analog signals carried on conventional umbilicals. The direct interface to the acquisition software for the VSI imager supports monitoring surface and downhole operations from one integrated QC panel, which  eliminates shot number mismatches and ensures accurate recording and reporting of source positioning and downhole data.

Optimized source synchronization for stable, noise-free signatures

The accuracy of the TRISOR element is ±0.5 ms or better, with typical gun synchronization values of ±0.1 ms. Continuous monitoring of the QC data significantly reduces the possibility of continuing a survey if there is an equipment malfunction. Safety is also intrinsic to operations with the TRISOR element because the guns cannot be fired while out of the water, and the controller defaults to automatic power-down mode if the cable is disconnected or leakage detected.

Depth and pressure sensors at the source are used to log the source depth and pressure with each shot. Firing is allowed only within the specified depth range. Pressure parameters are similarly set for firing to prevent source signature variations caused by variations in source pressure.

The calibrated near-field hydrophone integrated with the TRISOR element provides a higher quality signal than conventional hydrophones that improves source-signature deconvolution. The digital hydrophone data are recorded simultaneously with downhole data from the VSI imager.

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