From Raw Data to an Image Field Record (marine) Data Processing Stream Time Offset http://www.ig.utexas.edu/people/staff/ mrinal/Results/carlos_nn1_files/ image006.jpg Subsurface Image Courtesy of ExxonMobil F W Schroeder 04
L 3 - Types of Data Seismic Processing Deconvolution removing unwanted parts of the signal spiking Statics Correction Positioning Problems Energy Source s 0.2 up n ow
sd 0.2 0.4 s Bounce Point The seismic ray hits an inclined surface at 90 and reflects back Courtesy of ExxonMobil F W Schroeder 04 The reflection is displayed beneath the source-receiver midpoint L 5 Seismic Method Time for an Exercise
1 2 3 4 5 6
90 Where would the reflection lie? Courtesy of ExxonMobil F W Schroeder 04 L 5 Seismic Method Time for an Exercise 1 2 3
4 5 6 Compass Where would the reflection lie? Courtesy of ExxonMobil F W Schroeder
04 L 5 Seismic Method Time for an Exercise 1 2 3 4 5
6 Where would the reflection lie? Courtesy of ExxonMobil F W Schroeder 04 L 5 Seismic Method Exercise Answer 1 2
3 4 5 6 The reflection is downdip and its dip is less than the interface Courtesy of ExxonMobil
F W Schroeder 04 L 5 Seismic Method Wavefront Migration Correcting for Location Unmigrated energy on single trace... S R Sweep Ellipse S ...spread to all possible locations of origin R OR
Sweep Ellipse S R OR Sweep Ellipse Courtesy of ExxonMobil F W Schroeder 04 L 5 Seismic Method Migration Power of Correlation Two reflections on unmigrated data After spreading to all possible locations Reflections are not positioned
in the subsurface correctly since they have dip Constructive interference occurs where the reflections are properly positioned Destructive interference dominates where the reflections are NOT properly positioned Courtesy of ExxonMobil F W Schroeder 04 L 5 Seismic Method Other methods of migration Diffraction Stack Sum arrivals along Diffraction Hyperbola F W Schroeder
04 Seismic Migration Unmigrated Image Positioning Problems Blur the Image Migrated Image Migration Reduces Positioning Problems, which Improves the Image Courtesy of ExxonMobil F W Schroeder 04
L 5 Seismic Method Migration Example North Sea Salt Dome Velocity Model Kirchoff Migration Reverse Time Migration CGGVeritas
Upper-Level Frontogenesis Cliff Mass ... Reed 1957 Vertical Cross Section A Series of Aircraft-Based Field Experiments Described the Structure of Upper Level Fronts for A First Time Potential Vorticity As a Tracer of Air Parcel Origin Potential vorticity is high...
Institutionalism, Learning, and Patterns of Selective Decoupling: The Case of TQM Author: Daniel Z. Levin Last modified by: Daniel Z. Levin Created Date: 7/9/2001 1:21:41 PM Document presentation format: On-screen Show Company: FOM Other titles: Times New Roman Arial Default...
Ore Minerals in Reflected Light ... Section FE-83-1, parallel nicols , width 1,06 mm. Rutile grain showing the typical lamellae twinning. Chisel Lake, Manitoba, Canada. Parallel nicols, Oil immersion. 0.21 mm. Same photo as above. Observe the strong internal reflections.
Composite Data (includes data used for Flood Risk Report and Map) Delivery: Drafts presented at Resilience Meeting. Final delivered after Flood Risk review and discussions. Incorporated within Flood Risk DB, Report, and Map. The inputs to develop the FRA dataset...
Menopause Basics Learning Objectives: Describe the hypothalamic-pituitary-ovarian axis Differentiate between Perimenopause and Menopause Learn physiologic and anatomic changes at menopause Describe typical menopausal symptoms Perform focused history +physical for menopausal woman Interpret selected laboratory tests to evaluate menopause.
St. Thomas School Field Guides. Pacific Northwest Native Birds and Pla. nts. Lynette: Thanks, John and Athena, for sharing these lessons with us! Now, let's hear Bryent explain how I teach the William Morris lesson.