Abstract
The shear wave properties and their propagation mechanism are relatively complicated, their acquisition with shear source (S-S) is expensive and often impracticable. Land shear surveys are therefore rare, though multicomponent surveys (3C and 4C) in offshore are occasionally acquired with OBC mode to record shear waves (P-S) with P-source by deploying horizontal geophones on sea bottom.
Conventional P-surveys also generate mode-converted waves (P-Sv) that are recorded along P-reflections on land and offshore. This offers an excellent and convenient opportunity to analyze the combined P-and S-wave data. The benefits of joint studies provide more reliable prediction of rock-fluid properties and specifically help authenticate DHI anomalies for hydrocarbons through effective techniques such as AVO and Vp/Vs. Different classes of AVOs, their attributes and limitations are highlighted with examples and illustrations.
Vp/Vs (or Poisson’s ratio), an important hydrocarbon discriminant and ‘birefringence’, the unique S-wave property in anisotropic medium used for fracture detection, are outlined.
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Nanda, N.C. (2016). Shear Wave Seismic, AVO and Vp/Vs Analysis. In: Seismic Data Interpretation and Evaluation for Hydrocarbon Exploration and Production. Springer, Cham. https://doi.org/10.1007/978-3-319-26491-2_9
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DOI: https://doi.org/10.1007/978-3-319-26491-2_9
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