Acquisition system of shallow high-resolution shock stack seism and its application effects

摘要

High-resolution seismic prospecting is one of the common geophysical prospecting methods in the engineering investigation and how to excite the high-frequency is very important. When it is confronted with the stratum with loose land surface and the underground water level is relatively low, no matter hammer source or explosive energy source, can find no way out. Controlled source used by petroleum seismic prospecting can excite the high frequency, has strong interference-free capacity and has been widely used at home and abroad. Based on the basic principle of controlled source, this paper uses low power electric hammer for shock stack and acquires the effective wave signal with the dominant frequency of 80-150 Hz in the area with soft land surface and environmental interference, with the depth of investigation reaching up to 300m, entirely meeting the demand of shallow high-resolution seismic investigation. By means of the test and study on detection of buried depth of the bedrock in Yanjiao Town, this paper discussed the data acquisition and processing method of the acquisition system of shallow high-resolution shock stack seism and explained the efficiency and practibility of this method.