High-resolution Marine Sub-surface Investigation Using Multi-channel Seismic System
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1 High-resolution Marine Sub-surface Investigation Using Multi-channel Seismic System Kim, Jinhoo* (Dong-A University) Kim, Hyundo (GeoView Co. Ltd.)
2 Marine Seismic Survey Objectives Bedrock Mapping Seabed Classification Tunnel, Pipeline, and Cable Laying Ocean Resources Exploration Geological Structure Study Geotechnical Site Investigation Considering Safety and Economy
3 Single vs. Multi-channel Marine Seismic Survey Multichannel Singlechannel Small-scaled Multichannel Main Usage Geotechnical Study Geological Study, Oil and Gas Exploration Geotechnical and Geological Study Depth of Investigation Shallow Deep Mid Resolution High Low High Operation Simple Small Vessel Complex Large Vessel Simple Small Vessel
4 Configuration of Marine Seismic Survey DGPS Navigation System Seismic Survey System Source and Receiver Signal Conditioner & A/D Converter Data Acquisition and Processing Software Multi-MSDAS MSDAS Multi-MSPro MSPro
5 Signal Flowchart
6 8-ch. Seismic Survey System Analog Signal Conditioner A/D converter Data Storage Unit All in in one, PC-based Data Acquisition Monitoring Data Processing
7 8-ch. Streamer 3 Hydrophones / / ch. ch. Model AQ-1, Benthos Pre-Amplifier Installed 5 m / / ch. ch. Length : : m
8 Data Acquisition Software
9 Multi-MSDAS MSDAS Operates Seismic Survey System Controls Analog Signal Conditioner Controls A/D Converter Input Data Data Acquisition Parameters Stores Field Data in in International Standard Format (SEG-Y) Stores DGPS Information Monitors Field Data (QC) Generates Real-time Seismic Section
10 Data Processing Software
11 Multi-MSPro MSPro Generates High-resolution Seismic Section after Processing CMP (Common Mid Point) Gathering Digital Filtering Swell Filtering and Muting Deconvolution NMO Correction Stacking Generates Final Seismic Section
12 Multi-channel Data Processing
13 Velocity Analysis (1) By Semblance Spectrum Analysis Pohang Data Velocity Increases
14 Velocity Analysis (2) Semblance Spectrum Analysis Gaduk-island Data
15 Before Swell Filtering
16 After Swell Filtering & Muting
17 Comparison of Swell Filtering Effects Before After
18 Study Area Pohang Nakdong River Busan
19 Data Acquisition Parameters Parameters Source Number of Channels Group Interval Ch #1 Offset from the Source Shot Interval Analog Processing Sampling Interval Record Length Gaduk-Island Busan New Port Bubble Pulser 8 channel 5 m 5m 0.5 s Gain 5, No filter 0.1 ms ms Pohang Bubble Pulser 8 channel 5 m 5m 0.5 s Gain 2, No filter 0.1 ms ms
20 Survey Line #1 Pohang Busan
21 Multi-channel Seismic Section of Line #1 West East
22 Survey Line #2 Pohang Busan
23 Multi-channel Seismic Section of Line #2 East West
24 Multi-channel Seismic Section of Line #2 East West
25 Survey Line #3 Pohang Busan
26 Multi-channel Seismic Section of Line #3 SE NW
27 Survey Line #4 Pohang Busan
28 Multi-channel Seismic Section of Line #4 West East Fault
29 Survey Line #5 Pohang Busan
30 Multi-channel Seismic Section of Line #5 SE NW
31 Conclusions Construct a High-resolution Multi-channel Marine Seismic Survey System PC-based, Small-scaled, Economical System for Shallow Water Environment Various Sources can be be adopted Many Applications Site Investigation, Gas Hydrate Exploration, Geological Study, and so so on.
32
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