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SeisDaps

High-resolution marine seismic

data acquisition and processing system

SeisDaps-S1-LG Notebook-WaterMark-96dpi.png

Data acquisition system

- Composed of hardware consisting of PC and signal converter (a signal input conversion device 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

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SeisDaps PC-based data acquisition system

Notebook computer + signal converter

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Mini computer + signal converter

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SeisDaps-S1 signal converter (front)

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SeisDaps-S1 signal converter (rear)

SeisDaps-S1 software

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.

- The data sampling interval is set to an arbitrary value in the range of 0.05 to 10 ms for single-channel exploration and 0.1 to 100 ms for multi-channel exploration, depending on the frequency characteristics of the data. (however, a stable value is set after a recording test depending on hardware performance and record length, etc.)

- The record length is set in consideration of the shot time interval and the depth of the target layer 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. In shallow marine exploration with a shot interval of 1.0 s, if the record length is 0.5 s, 5,000 data are recorded.

- 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.

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

Screenshot of the SeisDaps-S1. This shows the results of filtering and other data processing (the section on the right shows good condition, with low-frequency components removed). The results of data acquisition and processing during field surveys are displayed in seismic sections.

Screenshot of SeisDaps Pro. This shows the results of filtering, stacking, and other data processing (the cross-section on the right shows low-frequency components removed, and the signal-to-noise ratio improved, demonstrating a good signal quality in the strata).