关键词: 深反射, 地震勘探, 采集试验, 最佳参数, 辽西

Abstract:

Seismic exploration is one of the most effective method on the research and analysis of underground structures. In order to find out the deep structural information of the west of  Liaoning Provience, we emplaced a  deep reflection seismic profile of 16.9 km in the region. As the region’s seismic and geological data is limited,  we carried out a test on  the parameters of deep reflection seismic acquisition  for the obtaining of seismic reflection signals from the deep strata. This test uses dynamite source, 428XL seismograph and SG-10 low-frequency detectors, fixing  acquisition parameters as  sampling interval  1 ms, channel spacing 20 m, and record length 15 s. A more comprehensive experimental work on  the acquisition parameters of motivating factors (excitation depth, explosive dose, combination of well excitation) and receiving elements (combined low frequency geophone) is launched. Based on the seismic records, the authors treat  6.5 s reflected signal as the main reflection layers. By  comparing and analyzing the signal energy and the SNR of the target layers, we  obtain the optimal  excitation and receive parameters as depth 15 m, dose 12 kg; combination of single well and Mitsui; geophone array using dot combinations. The results of the research show that we are able to  obtain deeper reflect information by increasing the exciting depth, the charge, employing combination of well and low-frequency detector and extend recording time etc.

Key words: deep reflection, seismic exploration, acquisition test, optimal parameter, the west of Liaoning province