By Donald Herron
Basics of Geophysical Interpretation is a pragmatic guide for the petroleum geophysicist. primary options are defined utilizing heuristic descriptions of seismic modeling, deconvolution, intensity migration, and tomography. Pitfalls in processing and contouring are defined in short. purposes contain petroleum exploration of carbonate reefs, salt intrusions, and overthrust faults. The e-book contains earlier, current, and attainable destiny advancements in time-lapse seismology, borehole geophysics, multicomponent seismology, and built-in reservoir characterization.
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Extra info for First Steps in Seismic Interpretation
The validity and utility of these velocities depend heavily on the accuracy of velocity-analysis techniques and the degree to which certain critical assumptions underlying the velocity calculations are met. The concept of multiplicity of subsurface (or multifold) coverage, in which reflections from a single subsurface point are recorded using multiple source-receiver geometries, establishes the basis for conventional seismic velocity analysis. As conceived, multifold acquisition was developed to more effectively enhance coherent signal and eliminate unwanted random and coherent noise, which could be achieved by adding, or stacking, the multifold data.
A) Traditional 3D time slice; faults parallel to strike are difficult to see. (b) Coherence time slice; faults are clearly visible. From Bahorich and Farmer (1995). interpretation tasks. Coherence displays such as that shown in Figure 7b also can be very useful for quality control of fault picks to ensure that faults are not miscorrelated in structurally complicated areas. Some interpreters prefer to pick faults primarily on coherence slices rather than on vertical sections when data quality permits.
The trough-over-peak signature of the anomaly suggests that it can be interpreted as a thin (below tuning) hydrocarbonbearing reservoir. Note similar trough-over-peak anomalies to the right of the highlighted event (courtesy PGS). Most if not all modern workstation systems and interpretation packages have standard routines for extracting amplitudes of individual reflections as well as of user-specified intervals of interest. In the latter case, the attribute is usually a statistical measure of the data within an interval (such as average absolute amplitude, maximum positive amplitude, or root mean square [rms] amplitude).
First Steps in Seismic Interpretation by Donald Herron