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題名 | Trigger Time Synchronization in Shallow Seismic Exploration=淺層震測激發時間同步化 |
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作者 | 孫鎮球; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 11:2 2000.06[民89.06] |
頁次 | 頁381-392 |
分類號 | 354.4 |
關鍵詞 | 淺層震測; Shallow seismic; Trigger time distortion; Cross-correlation; Common shot gather; |
語文 | 英文(English) |
英文摘要 | An algorithm to synchronize the trigger time in reflection shallow seismic data is developed. Trigger time delay and shot statics (hereafter together referred to as the shot distortion) are handled simultaneously. Theapproach is to estimate the shot distortion on each common shot gather(CSG) and then to eliminate the distortion by shifting all the traces in thatCSG. Relative shot distortion between two consecutive CSG's is estimatedby computing the average of the time shifts of maximum cross-correlationsbetween the first reflections on the corresponding traces in the two CSG's.The CSG number 1 is used as the datum on which shot distortion is estimated using receivers nearby shot location 1. The shot distortion on eachCSG is then calculated by relative shot distortion compared to CSG 1.Traces in all the CSG's are then shifted to eliminate the shot distortion,thus synchronizing the trigger times. Testing against field data shows thatalignment in common receiver gathers can be greatly improved, thereforesupporting the validity of this algorithm. |
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