Article 3 - Recent adv in multicomponent processing Flashcards
Recent advances
Define C-waves
PV to SV converted waves using OBC sensors
Recent adv
Specify 2 geophysical adv in using S-wave or C-wave data for seismic data interpretation
- enhances reservoir characterization - better picture
- v- waves are not inhibited by shallow gas clouds
Recent adv
What are the 3 methods of cable deployment?
- dragged array
- dragged and draped
- draped cable
Recent adv
What is a critical processing issue when using 3D-c-wave data set?
orienting ocean bottom multi-component resources
Recent adv
List 3 basic steps of the C-wave data processing flow?
- preprocessing all components
P wave time and depth processing
C wave time and depth processing
Recent adv
List 4 components for C-wave data processing?
hydrophone
vertical geophone
horiz s-wave geophone (IL)
horiz s-wave geophone (XL)
Recent adv
What 2 components of the 4 are summed during P-wave processing?
hydrophone
vertical geophone
Recent adv
What is the purpose of dual sensor summation ?
remove multiples
Recent adv
The use of 3 component geohpnes means the use of a processing step that is usualy more in land rather than marine. which step is it ?
statics
Recent adv
What does CCP mean ?
Common Conversion Point
Recent adv
Specify the effects of shallow gas on P wave and C wave data/
Shallow gas attenuates P-wave energy and distorts P-wae velocities
Recent adv
The horizontal component energy is transferred to 2 components. Which 2 ?
radial component (source-receiver direction) transverse component (perpendicular to radial)
Recent adv
Specify which portion of the Shar wave energy is contained in radial and transverse components?
Radial component contains max shear wave energy (polarized in 1 direction.).
Transverse component has minimum shear wave energy (orthodonal direction).
Recent adv
What does abnormal energy left in the transverse component mean?
indicator of anisotropy due to fractures or faults.
Recent adv
What is azimuthal anisotropy
Waves travelling east west are faster than north south
