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Multicomponent Reservoir Definition

Recording, processing, and interpretation of the full multicomponent seismic wavefield give direct access to reservoir properties, which formerly had to be inferred using conventional P-wave seismic data alone. Our clients can expect the following benefits from using multicomponent reservoir services:

  • Imaging of reservoirs below gas clouds and multiple-layer gas reservoirs through S-wave data
  • Lithology characterization using multicomponent seismic data
  • Reserve estimation from direct information about pore fluid and lithology
  • Drilling hazard prediction through pore pressure prediction and delineation of shallow gas
  • Delineation and characterization of the fluid flow within the reservoir from anisotropy measurements

Prestack data preconditioning and events matching for PP/PS inversion

Before performing inversion, the seismic data has to be pre-conditioned. The three key steps are:

  • data cleaning
  • PP/PS frequency matching
  • and amplitude scaling

In the time domain there are several intrinsic problems in PP/PS events matching:

  • differences in PP and PS reflection responses
  • uncertainty in phases of processed PP and PS data
  • differences in PP and PS wavelet frequency contents.

PP and PS events matching in time may become problematic. PP events differ significantly from PS in hydrocarbon saturated rock, therefore events matching are likely to fail at the reservoir level.

Joint inversion is generally performed on sample-to-sample basis, therefore PP/PS events matching become critical on each sample point. Considering the intrinsic problems in events matching, it becomes difficult to satisfy this essential condition, especially at reservoir level. A better way is to match the major correlatable PP and PS events around target horizons and leave uncertainty (linear interpolation) between them, which we call target-orientated PP/PS joint inversion.

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Workflow

Practical 4C interpretation workflow
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