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Technical Breakfast/NEW DATE
Friday 16-Jan-09 7:00 AM to 8:30 AM CST
Speaker: Pedro Muñoz
Repsol
We were unable to register you for this event as the event deadline has passed or the maximum number of seats available has been reached.
Fugro
6100 Hillcroft Ste 100
Houston TX
77081
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Details for "Technical Breakfast/NEW DATE"
Seismic Survey Design, Data Acquisition and Processing of Complex Andean Structures
The Andean foothills area is characterized by a complex subsurface, a rough topography with rapid elevation changes and a complex near-surface from low velocity unconsolidated alluvial deposits to high velocity hard rock formations. Survey design is an optimization process to acquire a high quality subsurface image subject to critical environmental and economical constrains. Project workflow included the following processes:
• Ray tracing analysis based on a geological model from existing 2D lines
• Coherent and random noise modeling
• Finite difference elastic modeling
• Imaging of synthetic data with different noise levels
Predicted results from survey design are validated during the following stages:
- Data acquisition - requires detailed control of source parameters (charge and depth).
- Data processing - with special effort in statics for complex near surface conditions, noise attenuation and an iterative structurally driven imaging processing.
Ray tracing analysis based on a geological model from existing 2D linesA geological model is created integrating existing 2D lines and well log data.Validation of the model is initially accomplished by ray tracing. Synthetic gathers are generated to examine the cinematic characteristics of events. Ray tracing helps to visualize that wide offset acquisition provides additional illumination of the deeper horizons in the shadow zone of the fault. These shadow zones are related to ray bending due to lateral velocity change through faults. Ray tracing also provides information on migration aperture needed for proper imaging of these complex structures. Figure 1.contains an example showing the limitations of a narrow offset - short line length 2D seismic acquisition.
Coherent and random noise modeling
Coherent noise to represent real characteristics of relative amplitude (N/S) and spatial variation was extracted from the existing 2D seismic data. 2D synthetic seismic shot gathers were created using wave equation finite difference modeling. These gathers were the input for shot profile wave-equation pre-stack depth migration (PSDM) to obtain the images of subsurface structures using different levels of noise.
Elastic modeling
Ray tracing modeling does not describe the full behavior of the wavefield since its resulting amplitudes are not generated based on the wave equation. Given that the objective of this project is to evaluate the effect of coherent and random noise on the final structural image, a more realistic amplitude determination is required. Full wavefield elastic modeling gives more accurate and realistic results as well as a full solution including head wave, internal multiples, and diffractions. For elastic wave-equation finite difference modeling, VECON, a software package developed by GeoTomo, was used to create the 2D elastic synthetic seismic shot gathers. A total of 881 shot gathers were generated using 25 meter shot and receiver intervals with offsets ranging from 0 m to a maximum of 10,000 m.
In the finite-difference modeling, a Ricker wavelet with a central frequency of 25 Hz and maximum frequency of 75 Hz was used as the source. The synthetic traces were 5 seconds long and sampled at 4 ms.
Pedro Muñoz, Sr. geophysical adviser - Upstream Geophysical Operations, Repsol USA.
WORK: 1980–1992 Assistant Professor Physics, Universidad del Valle, Colombia;
1992–2000 Field Geophysics Supervisor for Latin America Land Operations, Western Geophysical Company;
2001–2005 Reservoir Services Survey Evaluation Design Geophysicist, Schlumberger WesternGeco;
2005-present Sr. geophysical adviser Upstream Geophysical Operations, Repsol USA.
SCHOOL: MSc Geophysics 1989 University of Wyoming – USA;
BS Physics 1980 Universidad del Valle - COLOMBIA.
MEMBERSHIP: EAGE; SEG.
ADDRESS: 2001 Timberloch Place, suite 3000, T
he Woodlands TX, 77380 United States.
E-MAIL: pamunozr@repsol.com.
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Pricing |
| | Before 15-Jan-09 | After 15-Jan-09 | | Member: | $0.00 | $0.00 | | Non-Member: | $0.00 | $0.00 | | Student Member: | $0.00 | $0.00 | | Student Non-Member: | $0.00 | $0.00 | | Emeritus: | $0.00 | $0.00 |
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Event Contact |
Event Coordinator |
| Liz Ivie |
Marvin Taylor |
| (713) 369-5869 |
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