#TITLE_ALTERNATIVE#
CO CRS-stack method (Bergler et al, 2001) is the generalisation form of zero offset CRS-stack. CO CRS-stack depends on 5 (five) stacking operators. These stacking operators are emerge angles of the central ray in the position of the source and the receiver (βs and βg), and wavefron...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/13065 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | CO CRS-stack method (Bergler et al, 2001) is the generalisation form of zero offset CRS-stack. CO CRS-stack depends on 5 (five) stacking operators. These stacking operators are emerge angles of the central ray in the position of the source and the receiver (βs and βg), and wavefront curvatures associated to the central ray that computed at the respective emergence points (K1, K2 and K3). Those five parameters are related to wavefield attributes. These CO CRS stacking operators are data derived and fully automatically by means of coherency analysis. Thus, a velocity model of subsurface is not required to perform the stacking process. Only near-surface velocities around sources and receivers are necessary to know in order to calculate wavefield attributes with a geometrical meaning and to compute the search ranges for the attributes. A set of synthetic data was used to investigate the advantages of this method compared to conventional stack. The synthetic data is produced from Finite Difference Modeling that solve acoustic wave equation for undulated subsurface model.<p>The results of CO CRS-stack are better than the results of conventional stack method. The undulated reflectors can be mapped more clearly, so that the S/N ratio increase significantly. Even, if the fold coverage of seismic data is low, the result of CO CRS-stack still shows clearly undulated reflectors, in which conventional stack will fail in producing better images. Besides that, several attributes are produced as by products of this new method, which can be used as tool for interpretation. One deficiency of this method is that the time needed to process the data is longer than conventional stack.<p>The CO CRS stack is an alternative method that gives high quality stacked sections, as well producing important wavefield attributes. The application of this method will increase in the future, inline with the improvement of computer hardware technology. |
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