Seismic Processing

ALT provides state of the art seismic data processing which is supported by Paradigm software (Geodepth and Focus)

EXPERIENCE

ALT is able to process complex structure by using the latest processing technology and has experienced in processing for all Indonesian data and some regional data (East Africa, Middle East and South East Asia). This allows the rapid development and sharing of innovative solutions to any geophysical challenge.

2D/3D PRESTACK AND POSTACK TIME AND DEPTH IMAGING

3d-pre-stackALT offers a full range of 3D pre-stack and Post-stack time and depth migration methods, With supporting velocity model building Technology from the industry-leading Paradigm GeoDepth velocity model building and depth imaging system

 

  • Noise Attenuation
  • Refraction Static
  • Velocity Analysis
  • Multiple Noise Attenuation
  • Miss-tie Analysis
  • PSTM
  • PSDM

  • The new technique in Paradigm Echos system, which operates programs oriented on noise attenuation. LIFT – is a general method for modeling signal and noise and then, in a nonlinear adaptive fashion attenuation both coherent and random noise. Signal can be modeled in variety of conventional ways: array forming, FX Decon, Linear approximation of Zoeppritz equations (AVO reconstruction), etc.
  • Refraction statics was computed to compensate for extremely varying elevation surface and near-surface velocity anomalies by building a meaningful model of the subsurface based on first breaks picks.

    Interactive First Break QC

  • Velocity analysis is performed on selected CMP gathers or group of gathers. The output from one type of velocity analysis is a table of numbers as a function of velocity versus two way zero-offset time (velocity spectrum).

    • SRME: Surface Related Multiple Elimination
      SRME is two part processing sequence where the data is used to model the multiple, and that modeled multiple is then subtracted out from the data. Model can be generated from horizon of strongest reflector. This method chosen because it makes no assumption about move out or periodicity, and it requires no subsurface information



    • WEMA: Wave Equation Multiple Attenuation

  • Kirchhoff Migration
    Kirchhoff migration is the most commonly used migration for depth processing. It is particularly attractive due to its speed and target-oriented capability, which enables efficient velocity model building and updating. In addition, the Kirchhoff migration offers adaptability to irregular acquisition geometries, and flexibility in handling anisotropic and converted wave velocity models.

  • Pre Stack Kirchhoff Depth Migration has several benefits over DMO, primarily in its ability to improve structural imaging and provide correctly imaged pre-stack data for subsequent AVO analysis. Kirchhoff migration is a summation process, which is only performed for input traces that are within an aperture radius of the output point. The aperture radius is a time-variant function of the specified dip-limits. For each input trace and output sample, travel-times are computed to determine the proper input sample to sum. Input sample values are scaled and filtered before summing. Anti-alias filters as a function of dip and midpoint distance are applied to the data during migration.