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- W2032059499 abstract "ABSTRACT A data set, comprising a vertical seismic profile (VSP), logs, and a seismic section, is discussed primarily in terms of stratigraphic interpretation of seismic events. The logs are presented in their original forms, as well as in interpreted forms suitable for comparison to seismic data. The VSP data are processed for comparison to the seismic section. A simple estimate of the frequency content of the seismic signal with depth is made. The importance of using a full suite of logs in the interpretation of seismic data is illustrated. INTRODUCTION The vertical seismic profile provides for the accurate depth determination of upgoing and downgoing seismic events; it thus allows a study of the seismic wavelet and permits a close comparison of the character of reflected events with formation properties as indicated in the well logs. The correlation of the VSP data and the log data is of interest because it includes, to the extent not possible in the laboratory, the in situ character of the formation, such as degree and type of saturants, pressure, formation thickness, etc. For the seismic data, the reliability of the correlation is dependent on the data quality and the degree to which the upgoing reflections can be confidently extracted from the vertical sections. For the logs, data quality is again important, as are selection and processing of the logs. With a comprehensive data set of good quality, detailed interpretation of the VSP data and, therefore, of the surface seismic data can be enhanced for formation evaluation. In this paper, this correlation is carried out for a data set obtained offshore in a sand-shale sequence. The nearly 12,000-foot-deep well was cased in three sections: to 990 feet, to 5720 feet, and then to total depth. The seismic data were acquired with a single 200-cubic-inch airgun operated at 2000 psi from the rig. The downhole receiver was the Schlumberger Well Seismic tool. A suite of logs was acquired in the well before casing was set. All these data were acquired as part of a standard commercial operation with no special procedures used. PRODUCTION OF THE VSP Typically, 4 airgun shots were acquired and stacked (or averaged) at each of 75 levels in the well. The levels were 150 feet apart, and the data were acquired at I-ms intervals. After data editing and filtering, a velocity filter was applied to separate upgoing and downgoing events. Then, a predictive deconvolution operator was applied to each level to suppress multiples, and that was followed with a wavelet deconvolution process to produce a zerophase wavelet. In each of these deconvolution steps, we have referred to the downgoing wave data set at a particular level to compute the filter for processing the level's corresponding upgoing wave data set. Figure 1 summarizes the processing of the data." @default.
- W2032059499 created "2016-06-24" @default.
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- W2032059499 date "1983-05-02" @default.
- W2032059499 modified "2023-09-27" @default.
- W2032059499 title "Interpretation Aspects of Offshore VSP Data" @default.
- W2032059499 doi "https://doi.org/10.4043/4540-ms" @default.
- W2032059499 hasPublicationYear "1983" @default.
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