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題名 | 寶山-竹東地區震測模擬與重合前深度移位=Seismic Modeling and Pre-stack Depth Migration in Pausan-Chutung Areas |
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作者 | 徐祥宏; 林人仰; 楊耿明; 黃旭燦; 丁信修; 楊育良; | 書刊名 | 臺灣石油地質 |
卷期 | 37 民94.12 |
頁次 | 頁123-136 |
分類號 | 457.2 |
關鍵詞 | 震測模擬; 成像分析; 重合前深度移位; Seismic modeling; Imaging analysis; Pre-stack depth migration; |
語文 | 中文(Chinese) |
中文摘要 | 震測模擬與成像分析是輔助複雜構造震測資料與震測資料解釋之良好工具,寶山-竹東地區V1線震測模擬與成像分析結果顯示,對於目前之解釋構造,逆斷層下盤由於側向速度變化之效應,傳統之重合後時間移位已無法準確呈現細部之地下構造形貌,進一步之深度移位處理有其必要性。實際最終重合剖面與合成最終重合剖面之比對,淺部主要地層之反射信號相當符合,深部主要地層之反射信號大致符合,顯示目前之解釋形貌尚具一定程度之準確度與可靠性。 重合前深度移位(PSDM)是最適宜克服複雜構造問題之技術,V1線重合前深度移位結果顯示,反射信號與成像品質有相當明顯之改善,尤其1秒以下較深部之反射信號更有顯著之改進,顯示此技術之建立及應用已臻成熟,然整體而言,由於信號/雜訊比之差異,淺部地層之成像品質明顯優於較深部地層,顯示較深部地層之信號/雜訊比依然是一重要課題。 |
英文摘要 | Seismic modeling and imaging analysis are the favorable tools for assisting seismic data processing and interpretation of complex structure. The results of seismic modeling and imaging analysis of Line V1 in the Pausan-Chutung area show that conventional post-stack time migration cannot accurately represent the strurctures in the subsurface due to lateral velocity variations in the footwalls of the thrusts, and thus the application of depth migration will be necessary. From comparison between real and synthetic final-stack sections, reflections from shallow horizons correlate well, and the deeper horizons also indicate a reasonable match. This suggests that the current interpreted structural geometry may be somewhat reliable and accurate. Pre-stack depth migration (PSDM) is a technique most suitable for overcoming the problem of imaging complex structure. By using pre-stack depth migration reflection, signals and imaging quality of Line V1 show considerable improvement. The remarkable improvement in the quality of the deeper horizons below 1 second indicates a proficient application of the PSDM technique. Due to a favorable signal to noise ratio (S/N), the imaging qualities of shallower horizons are superior to that of deeper horizons. Therefore, the signal to noise ratio (S/N) of deeper horizons is still a significant area for improvement. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。