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| * To link well log depths to seismic section times. | | * To link well log depths to seismic section times. |
| * To develop an understanding of the causes of constructive and destructive interference patterns of individual wavelets originating from acoustic impedance contrasts. | | * To develop an understanding of the causes of constructive and destructive interference patterns of individual wavelets originating from acoustic impedance contrasts. |
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| + | [[file:exploring-for-stratigraphic-traps_fig21-22.png|thumb|{{figure number|1}}After .<ref name=ch21r44 />]] |
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| ==Using synthetic seismograms== | | ==Using synthetic seismograms== |
| The composite synthetic seismic trace from a synthetic seismogram relates depth information from logs to seismic time. The plots of individual wavelets in a synthetic seismogram show how each impedance interface contributes to the individual reflections. Vail<ref name=ch21r44 />) recommends that seismic sequence analysis and well log sequence analysis be started independently so that boundaries be interpreted as objectively as possible before they are tied together by a synthetic seismogram. | | The composite synthetic seismic trace from a synthetic seismogram relates depth information from logs to seismic time. The plots of individual wavelets in a synthetic seismogram show how each impedance interface contributes to the individual reflections. Vail<ref name=ch21r44 />) recommends that seismic sequence analysis and well log sequence analysis be started independently so that boundaries be interpreted as objectively as possible before they are tied together by a synthetic seismogram. |
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− | Below is an example of a synthetic seismogram from the Midland basin, Texas.
| + | [[:file:exploring-for-stratigraphic-traps_fig21-22.png|Figure 1]] an example of a synthetic seismogram from the Midland basin, Texas. |
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− | [[file:exploring-for-stratigraphic-traps_fig21-22.png|thumb|{{figure number|21-22}}After .<ref name=ch21r44 />]] | |
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| ==Procedure== | | ==Procedure== |
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| | Adjust depositional sequence and systems tract boundaries to the best solution using the ties made in step 2. | | | Adjust depositional sequence and systems tract boundaries to the best solution using the ties made in step 2. |
| |} | | |} |
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| + | [[file:exploring-for-stratigraphic-traps_fig21-23.png|thumb|{{figure number|2}}. Copyright: Ramzy et al., 1996; courtesy Egyptian General Petroleum Corp.]] |
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| ==Example of integrating synthetics== | | ==Example of integrating synthetics== |
− | [[Synthetic seismogram]]s, or synthetics, can be interactively tied to log, lithologic, and seismic data on geological workstations. The figure below illustrates an example from the Gulf of Suez basin. A wavelet trough forms at a sequence boundary (T55) overlain and sealed by anhydrite and salt. A pronounced wavelet peak forms on an underlying maximum flooding surface. The intervening sequence consists of a lobate deltaic fan formed during a relative high-stand. The transgressive systems tract is thin to absent. The geometry of the fan is clear from the well log and seismic integration. | + | [[Synthetic seismogram]]s, or synthetics, can be interactively tied to log, lithologic, and seismic data on geological workstations. [[:file:exploring-for-stratigraphic-traps_fig21-23.png|Figure 2]] illustrates an example from the Gulf of Suez basin. A wavelet trough forms at a sequence boundary (T55) overlain and sealed by anhydrite and salt. A pronounced wavelet peak forms on an underlying maximum flooding surface. The intervening sequence consists of a lobate deltaic fan formed during a relative high-stand. The transgressive systems tract is thin to absent. The geometry of the fan is clear from the well log and seismic integration. |
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− | [[file:exploring-for-stratigraphic-traps_fig21-23.png|thumb|{{figure number|21-23}}. Copyright: Ramzy et al., 1996; courtesy Egyptian General Petroleum Corp.]]
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| ==See also== | | ==See also== |