关键词: 低频信号, 低频可控震源, 全流量低频极限频率

Abstract: The low-frequency vibrator is a novel seismic signal excitation device that has been redesigned to the vibrator and hydraulic system completely on the basis of conventional vibrator. It broke through the technical? bottlenecks of the traditional vibrator in stimulating low-frequency seismic signals and allowed low-frequency vibration signals exciting. The technical advantages of low frequency vibrator showed that the effectively workable excitation frequencies could be 3-120Hz and the effective output signal was 1. 5Hz by using the phase transformation function constraint in the scanning signal design; the structure design of the vibrator can fully satisfy maximum flow requirements of the system under the low frequency limit of 3Hz; the flow distribution technology of the hydraulic pump is efficiently applied to meet the needs of the hydraulic system for flow rate; the flow conversion of the hydraulic system and driving system are controlled by industrial computer (Plus One) with safe redundant design; independent patent seismic isolation design and I-shaped slabbed construction based on the isostress design are developed, thus the nonlinear effect in transmitting signals and signal catching capability of equivalent mass to the earth have been improved significantly. The low-frequency seismic exploration technology has been fully verified in the engineering practice such as in imaging targets covered by deep pre-salt igneous rocksand shallow igneous rock, and showed its capacity that low frequency seismic signals could solve complex geological target imaging.