A High-Power Computer-Controlled Marine Vibroseis® System

Abstract

A marine Vibroseis system is described that provides for a substantial increase in radiated power. The system is computer-controlled for precise sweep generation, compositing of successive sweeps, and formatting of the tape recording. This increase in radiated power with precision signal generation and recording has demonstrated a survey capability of twice the speed of that previously used. The computer control provides for a soft-wired system that permits optional mode changes and offers the means for further automation of positional control with data collection. On-board monitoring with single-channel continuous correlation provides for a continuous profile plot of any one of the 24 recording intervals of the towed hydrophone array. Through use of diagnostic programs, the system is periodically checked, which assists the operator in determining any fault as well as assisting in corrective action. The system provides for a type-out of the operating log.