Application and quality control of an improved dynamic slip sweep technique

To improve production efficiency while ensuring seismic data quality in vibroseis high-efficiency acquisition technology, a time-depth(T-D) high-production parameter design method was proposed based on harmonic energy attenuation.The slope T-D rule replaces the conventional stepped T-D parameter design.A slip window is used to improve the accuracy of T-D quality control.First, the slope is embedded into the step T-D parameter curve, and the shortest distance for slip sweep in the T-D rule is determined according to the inverse function attenuation characteristic of harmonic noise energy in the range of short excitation distance.The slope is adjusted to make the slip time-distance change to be consistent with the harmonic energy attenuation trend during long-distance excitation.Subsequently, based on the analysis and comparison of conventional and improved T-D quality control methods, the limitations of conventional quality control were identified.Several hidden void shots can be found with the improved method using arbitrary-shot T-D quality control.The slope T-D acquisition parameter design method and improved T-D QC technology have been successfully applied in actual production projects and can improve acquisition efficiency and avoid quality issues.