Moveout-Based Spreading Correction for Mode-Converted Waves Ellen (Xiaoxia) & Ilya.

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Presentation transcript:

Moveout-Based Spreading Correction for Mode-Converted Waves Ellen (Xiaoxia) & Ilya

Moveout-Based Geometrical Spreading P S

VTI Model

Nonhyperbolic Moveout Equations Tsvankin & Thomsen (1994) Alkhalifah and Tsvankin (1995)

Accuracy of MASC with η-Equation Offset/Depth Spreading (km) Ray tracing MASC

CMP Gather Time (s) Offset (km) PP PS SS

Processing Flow  pick amplitude  correct for source and receiver directivity  correct for geometrical spreading  calibrate amplitude

Comparison of Conversion Coefficients Horizontal slowness (s/km) Exact MASC t 2 -gain

Transmission Loss Horizontal slowness (s/km)

Moveout Equation in ORTH Media

Orthorhombic Model x1x1 x3x3 ISO x2x2

Spreading (km) Offset (km) azimuth 90 o azimuth 0 o Accuracy of MASC with η-Equation

VTI/ORTH Model x1x1 x3x3 VTI ISO x2x2

Spreading (km) Offset (km) azimuth 90 o azimuth 0 o Accuracy of MASC with η-Equation

Conclusions  same algorithm for PP and PSV  accuracy of η-equation for PSV lower than for PP  important for AVO analysis

Tilted Transversely Isotropic (TTI) Model

Traveltime Surface for TTI layer Traveltime (s) X (km) Y (km)

Accuracy of MASC Offset (km) Spreading (km) MASC Ray tracing

Future Work Jonah field data application

Layered VTI Model ISO

Layered ORTH Media (aligned )

Layered ORTH Media (misaligned)

Generic equation of geometrical spreading Červený (2001)