Abstract:

The quality of seismic data collected in complicated southern area with mountains and bare carbonates, is hard to reach the desired effect. This paper does a series of comparative analyses about technologies and methods for seismic data acquisition based on thorough understanding of the geological characteristics and the key exploration technical difficulties of seismic. (1) Using various surface survey techniques to fulfill fine surface structure survey, and to set up relative accurate nearsurface structure model and velocity model for computing statics, choosing the best well site and designing well depth. (2)  Dynamic observation system is used widely in the southern complex terrain. For example, long arrangement and wide shot distance is utilized to deal with imaging of high and steep structure, observation system with increased density is employed in limestone district, and wideline observation system is adopted in the special region with caverns and fissures. (3) The conditions of excitation and reception are improved to meet the sophisticated exploration needs of multilayer lithology with naked rocks. The position of shot is optimized to adapt the lithology changing and to avoid caverns and thick pure limestone district. Double well combined excitation is often used in the limestone district, and large combined reception need more than two strings of detectors per channel. Of course, the reception effect of detector in the well is better than those on the ground. Applying the above techniques and methods to processing and analyzing the collected seismic data, the quality of the seismic profiles and single shot records are improved, and both seismic reflection wave energy and SNR are all heightened

Key words: complicated mountain area, carbonate outcrops, quality of seismic data, wideline seismic acquisition, double well combination