ÖNCEL AKADEMİ: INTRODUCTION TO GEOPHYSICS
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The document discusses seismic reflection acquisition, processing, and waveform analysis. It provides examples of a large seismic data acquisition project in Saudi Arabia that collected over 120 million traces. It also defines key concepts in seismic processing like normal moveout correction, velocity analysis, muting, static corrections, average velocity, root mean square velocity, and interval velocity. It notes that the mid-term exam will be on May 3rd and that a field trip is scheduled for April 26th.
![Introduction to Geophysics Ali Oncel [email_address] Department of Earth Sciences KFUPM Seismic Reflection 3: Acquisiton, Processing, and Waveform Analysis Introduction to Geophysics-KFUPM](https://image.slidesharecdn.com/lecture8-2-091220223607-phpapp01/85/ONCEL-AKADEMI-INTRODUCTION-TO-GEOPHYSICS-1-320.jpg)
![Interval Velocity (V int ) For n=2 V 1 = Stacking velocity for reflection from upper interface [V RMS (1)] V 2 = Stacking velocity for reflection from lower interface [V RMS (2)] Dix, 1955 (p.130 of Sheriff and Geldart, 1995) V int = Δ Z/ Δ t V int = average velocity between two interfaces Δ Z= thickness of layer between the two interfaces Δ t= one-way travel time between the two interfaces Introduction to Geophysics-KFUPM](https://image.slidesharecdn.com/lecture8-2-091220223607-phpapp01/85/ONCEL-AKADEMI-INTRODUCTION-TO-GEOPHYSICS-5-320.jpg)
ÖNCEL AKADEMİ: INTRODUCTION TO GEOPHYSICS
- 1. Introduction to Geophysics Ali Oncel [email_address] Department of Earth Sciences KFUPM Seismic Reflection 3: Acquisiton, Processing, and Waveform Analysis Introduction to Geophysics-KFUPM
- 2. Previous Lecture Example: Data Acquisition in Shaybah Field ( Alfaraj et al., 1998, GeoArabia, Vol. 3, No 2 ) Over 120 million seismic traces and over 100,000 shot points, covering an area of about 1,100 sq km. Primary Reflection Multiples NMO – Normal Moveout Correction Velocity Analysis Example: Gathers and NMO Corrected CMP Mute Static Corrections Introduction to Geophysics-KFUPM
- 3. Average Velocity V av = average velocity above the interface Z= depth from the surface to the interface t= one-way travel from surface to interface Introduction to Geophysics-KFUPM
- 4. Root Mean Square (RMS) Velocity V RMS = root mean square velocity V i = seismic velocity of the i th layer t i = two-way travel time within the i th layer Introduction to Geophysics-KFUPM
- 5. Interval Velocity (V int ) For n=2 V 1 = Stacking velocity for reflection from upper interface [V RMS (1)] V 2 = Stacking velocity for reflection from lower interface [V RMS (2)] Dix, 1955 (p.130 of Sheriff and Geldart, 1995) V int = Δ Z/ Δ t V int = average velocity between two interfaces Δ Z= thickness of layer between the two interfaces Δ t= one-way travel time between the two interfaces Introduction to Geophysics-KFUPM
- 10. Mid-Term Exam May 3 Field-Trip April 26, 12.30 PM Introduction to Geophysics-KFUPM 12.10 AM- 13.00 AM We may recover two classes time
- 11. What does fold mean in the CMP method? Give an example. What are the two advantages of the CMP method over previous methods? P.C: Open Book The quiz of the week Introduction to Geophysics-KFUPM
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