Comparison of vibroseis and dynamite acquisition techniques from an area of rough surface topography and outcropping high velocity carbonates
- Chevron Overseas Petroleum, Inc., San Ramon, CA (United States)
Comparison of recording methods in an area of rough surface topography and outcropping high velocity carbonates demonstrates clear advantages in terms of signal quality and reduced cost for the high fold vibroseis acquisition method over conventional, lower-fold dynamite acquisition. A comparison of shot gathers for the two acquisition methods shows that the vibroseis technique results in an increase in relative amplitude of reflection energy versus ground roll and linear noise trains. This increase may be due to several factors including the stronger source effort within the fundamental frequency range (12--60 Hz), improved source coupling, and noise cancellation due to multiple sweeps, source moveup and the statistical advantages of cross-correlation. The vibroseis survey was acquired with higher fold by a factor of four, although costs were roughly half that of the conventional dynamite program. In addition, the widespread prevalence of roads and trails in the study area made the vibroseis method a viable approach, even in the mountainous portions of the survey. Finally, it was observed that a critical threshold of seismic signal appeared to be required for successful application of a number of seismic processing routines including residual statics computation and estimation of stacking velocities, and this threshold was achieved throughout much of the vibroseis data acquired.
- OSTI ID:
- 93126
- Report Number(s):
- CONF-941015--
- Country of Publication:
- United States
- Language:
- English
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