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• W2080647567 abstract "ABSTRACT A procedure has been developed for the VIBROSEIS® method of seismic exploration wherein the sweep or pilot signal is applied continuously to the vibrator during the acquisition period.. This method allows for increasing the duty cycle of the vibrators to as high as 1000/0. An increase in vibrator utilization is equivalent to increasing the vibrator power. A description of the method is given and examples of sections obtained with the continuous sweep method are compared to sections obtained with the normal sweep/listen method. INTRODUCTION In the VIBROSEIS method, the power output or resulting signal-to-noise ratio is directly proportional to the vibrator on time. This results from considering that the peak power in the pulse compression process is the pulse compression ratio. (available in full paper) or, the signal-to-noise ratio is proportional to the vibrator 1 on time. In considering data processing costs, the time required for correlation is important. Thus, in considering a maximum on time for the vibrators, we must also consider a minimum correlation time. A first consideration for maximizing the lion time is to lengthen the sweep time. However, this also lengthens the correlation time. The sweep repetition rate cannot be faster than the section time of interest. This is necessary to meet the requirement for having a unique pilot signal, i. e., for never repeating over the section time or depth of interest. Thus, the maximum sweep length time for a minimum correlation time is the desired section time. In marine VIBROSEIS operations, the time for data acquisition is the time required to traverse one station interval. With a ship speed of 6 knots or 10 feet per second, the time for data acquisition using a 228-foot interval is then 22.8 seconds. Normal procedures of equal sweep and listening periods, do not permit two acquisitions per interval when the section time is 6 seconds or more. Therefore, it is common to shorten the listening period to reduce the cycle time and so permit two acquisitions to be obtained. For example, using a sweep length of 6.8 seconds and a 4. 5-second listening time, two acquisitions require 22.6 seconds or essentially the maximum time allowable at 6 knots for a 228-foot interval. The effect of shortening the listening period is to restrict the usefulness of the last part of the sweep on deep events. In effect, this produces a time variant filter with an increasing frequency or upsweep such that the high frequency end of the sweep is not available for that portion of the section that is greater in time than the listening period. This procedure is very useful for increasing the vibrator duty cycle without deteriorating the data quality. However, the method is restricted depending on the sweep used and the section time desired. Therefore, the method of continuous sweeping has been developed to permit a major increase in vibrator duty cycle or on time." @default.
• W2080647567 created "2016-06-24" @default.
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• W2080647567 date "1970-04-21" @default.
• W2080647567 modified "2023-09-27" @default.
• W2080647567 title "The Continuous Sweep VIBROSEIS®Method" @default.
• W2080647567 doi "https://doi.org/10.4043/1205-ms" @default.
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