Reprocessing of a 2d seismicline in foulness island, UK,to derive a high-resolutionsubsurface velocity model
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- Tez No: 717346
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Jeofizik Mühendisliği, Geophysics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Unıversıty Of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
In Foulness Island, Essex, UK, several studies were undertaken by the University of Leeds to determine the underlying site conditions for broadband seismometer installations. However, velocity models derived in previous studies were preliminary and focused on shallow geological units. Therefore, a high-resolution 717-metre 2-dimensional seismic reflection line acquired in 2018 was reprocessed to provide a detailed velocity model for the site. A new processing workflow was established to reprocess the data with carefully selected parameters and a detailed velocity analysis for a better stacked section. By incorporating the outcomes of the velocity analysis with near-surface results from a previous study, a complete and detailed velocity model was produced for the upper 500 m below the surface. Depths to target Lower London Tertiaries and Cretaceous Chalk units were determined as 161 m and 215 m, respectively. Moreover, the model suggests that corresponding interval velocities range between 1500 m/s and 2450 m/s, and between 3100 m/s and 3750 m/s within Lower London Tertiaries and Cretaceous Chalk, respectively. A qualitative comparison between the same processing steps in this study and a previous study suggests an improved signal-to-noise ratio. As for the quantitative comparison, the resulting velocity model was compared to the model from the same study and its effectiveness was evaluated by measuring RMS amplitudes and residual moveout of the stacked sections produced by these models. The velocity model derived in this study increases the mean RMS amplitude by up to 16% for certain sections of the stack and reduces mean residual moveout by 50%. Consequently, reprocessing enabled to bring up weak reflections and identify 3 velocity inversion cases between London Clay and Lower London Tertiaries, between Upper Chalk and Middle Chalk and between Lower Chalk and Gault Clay. Therefore, it also enabled the contribution to the site characterisation for future studies.
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