# Effect of migration on fault interpretation

Series | Geophysical References Series |
---|---|

Title | Problems in Exploration Seismology and their Solutions |

Author | Lloyd P. Geldart and Robert E. Sheriff |

Chapter | 9 |

Pages | 295 - 366 |

DOI | http://dx.doi.org/10.1190/1.9781560801733 |

ISBN | ISBN 9781560801153 |

Store | SEG Online Store |

## Problem 9.30

Interpret the faulting in Figure 9.30a to see how much improvement migration makes.

### Solution

Among the evidences for faulting are interruptions in the continuity of events and offset of events; additional faulting criteria are discussed in problem 10.5. While the larger faults can be picked on the unmigrated section, their evidences are sharpened by migration and additional faults can be picked. Figure 9.30b shows a fault interpretation of Figure 9.30a(ii). Some faults appear to die out as one goes shallower in the section; some of this die-out is probably real, some may be because the fault throw becomes too small to see clearly. Evidences of faulting also often disappear as one goes deeper because of deteriorating resolving power or data quality.

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Finite-difference migration | Derivative and integral operators |

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Reflection field methods | Geologic interpretation of reflection data |

## Also in this chapter

- Fourier series
- Space-domain convolution and vibroseis acquisition
- Fourier transforms of the unit impulse and boxcar
- Extension of the sampling theorem
- Alias filters
- The convolutional model
- Water reverberation filter
- Calculating crosscorrelation and autocorrelation
- Digital calculations
- Semblance
- Convolution and correlation calculations
- Properties of minimum-phase wavelets
- Phase of composite wavelets
- Tuning and waveshape
- Making a wavelet minimum-phase
- Zero-phase filtering of a minimum-phase wavelet
- Deconvolution methods
- Calculation of inverse filters
- Inverse filter to remove ghosting and recursive filtering
- Ghosting as a notch filter
- Autocorrelation
- Wiener (least-squares) inverse filters
- Interpreting stacking velocity
- Effect of local high-velocity body
- Apparent-velocity filtering
- Complex-trace analysis
- Kirchhoff migration
- Using an upward-traveling coordinate system
- Finite-difference migration
- Effect of migration on fault interpretation
- Derivative and integral operators
- Effects of normal-moveout (NMO) removal
- Weighted least-squares