Determining lithology from well-velocity surveys
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| Series | Geophysical References Series |
|---|---|
| Title | Problems in Exploration Seismology and their Solutions |
| Author | Lloyd P. Geldart and Robert E. Sheriff |
| Chapter | 5 |
| Pages | 141 - 180 |
| DOI | http://dx.doi.org/10.1190/1.9781560801733 |
| ISBN | ISBN 9781560801153 |
| Store | SEG Online Store |
Problem 5.7
By comparing the velocity-depth relations in Figures 5.6a and 5.7a, what can you deduce about the nature of the rocks in the well for Figure 5.7a?
Solution
We superimpose the sand-shale curve from Figure 5.6a on Figure 5.7a (the dashed line) and note that the data are nearly parallel. It appears that the geologic section represented by Figure 5.7a is normally pressured, mainly clastics, and has not been uplifted significantly (i.e., the velocity is about what is expected for normal compaction).
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| Effect of burial history on velocity | Reflectivity versus water saturation |
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| Geometry of seismic waves | Characteristics of seismic events |
Also in this chapter
- Maximum porosity versus depth
- Relation between lithology and seismic velocities
- Porosities, velocities, and densities of rocks
- Velocities in limestone and sandstone
- Dependence of velocity-depth curves on geology
- Effect of burial history on velocity
- Determining lithology from well-velocity surveys
- Reflectivity versus water saturation
- Effect of overpressure
- Effects of weathered layer (LVL) and permafrost
- Horizontal component of head waves
- Stacking velocity versus rms and average velocities
- Quick-look velocity analysis and effects of errors
- Well-velocity survey
- Interval velocities
- Finding velocity
- Effect of timing errors on stacking velocity, depth, and dip
- Estimating lithology from stacking velocity
- Velocity versus depth from sonobuoy data
- Influence of direction on velocity analyses
- Effect of time picks, NMO stretch, and datum choice on stacking velocity
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