SeisDaps
High-resolution marine seismic
data acquisition and processing system
Data acquisition system
- Composed of hardware consisting of PC and signal converter (signal input converter with built-in A/D converter) and SeisDaps software that controls it
- SeisDaps software: Input data acquisition parameters such as data sample interval, recording time, gain control, output file name, data format, etc., and record it in SEGY format
- Quality Control (QC): Display the signal and display the real-time frequency spectrum -> Possible to check the status of the signal during data recording. Easy to enlarge or reduce the display section
- Simple system operation: When changing the survey line, only the file name is changed to record data and automatically save the changed data acquisition parameters
SeisDaps PC-based data acquisition system
Notebook computer + signal converter
Mini computer + signal converter
SeisDaps-S1 signal converter (front)
SeisDaps-S1 signal converter (rear)
SeisDaps-S1 software
Data processing system
- Perform data processing of gain recovery, deconvolution, and filtering and save the result in SEGY format
- Perform data processing simultaneously with data recording or during playback
- Quality control (QC) is possible by displaying data processing results on the screen during exploration
- Production of seismic section image file
Screen of the SeisDaps-S1 indicates the filtering result during the data processing stage (low frequency components are removed to show good condition). Data acquisition/processing results are shown in seismic section during the survey
Data acquisition system operation
Data acquisition parameter setting
- Input parameters such as data sample interval, recording time, gain, output file name, data format, etc.
- SeisDaps-S1 is a single-channel data acquisition system, and SeisDaps Pro is 8-channel data acquisition system.
- Data sampling interval can be set as an arbitrary value in the range of 0.02 ~ 100 ms according to the frequency characteristics of the data.
- The recording time is set in consideration of the shot time interval and the depth of the stratum to be explored.
- Gain control value is set among 1, 2, 4, 8 when the input signal is less than +/- 10 v
- Enter the file name of the survey data to be recorded and prepare it before entering the survey line
- When entering the survey line, click the start recording button to start data recording
Data acquisition parameter setting example
- Air gun/sparker exploration: It mainly targets the strata with a depth of several tens to hundreds of meter. Since the main frequency band is 100 to 1,200 Hz, data sampling intervals of 0.1 ms or 0.2 ms are used.
- SBP (sub-bottom profiling) exploration: In the shallow strata survey targeting a depth of several tens of meter, the main frequency band is 1-3.5 kHz, so a data sampling interval of 0.05 ms is used. If the recording time is 0.3 s in the shallow geological survey with a shot interval of 0.5 s, 6,000 data are recorded for each shot.
SeisDaps type
SeisDaps-S1 signal converter
SeisDaps-S1 software
SeisDaps Pro signal converter
SeisDaps Pro software
Data processing system operation
Data processing parameter file example
- Version information in line 1 of the data processing parameter file
- In line 2, the number of data processing processes
- Afterwards, the data processing process consists of 2 lines of each command and parameter.
Data processing parameter setting
- GDEL: Delay time correction, reset of recording time
- GAIN : A, B, C variable of gain function and 0 level correction value
- DCON: Deconvolution operator length, prediction distance, autocorrelation function length, starting position (unit: ms)
- FILT: digital filtering, trapezoidal 4 frequency
Data processing parameter file example of SeisDaps-S1
(Including data processing stage and necessary parameters for each stage)