SeisDaps application examples
Field exploration (8-channel exploration)
- An air gun is used for the seismic source, an 8-channel streamer cable is used for the receiver, and a PC-based data acquisition/processing system is used for data recording (Lee et. al., 1996).
- Data was acquired from Yeosu offshore at sample interval of 0.1 ms, shot interval of 5 m, and group interval of 5 m
- The computer process includes basic data processing processes such as common midpoint (CMP) sorting, gain recovery, deconvolution, digital filtering, normal moveout (NMO) correction, static correction and stacking (Lee et. al., 2021)
Data processing flow
Multi-channel digital data processing effect. (a) Analog recording. (b) Single-channel digital seismic section. (c) Filtered 4 fold stacked seismic section. (d) A seismic section with additional deconvolution in (c).
Resolution evaluation
- Yeosu offshore data: Represents the resolution that can distinguish 70-80 cm of strata at a depth of 30-40 m below the seabed (Lee et. al., 2014)
- Pohang offshore data: Faults are well developed. Especially the fault located in the center about 60 m below the sea floor, clearly showing that the fall is about 1 m (Lee et. al., 2004).
Yeosu offshore data: Resolution capable of distinguishing 70-80 cm of strata at a depth of 30-40 m below the seabed
Pohang Offshore Data: Resolution capable of distinguishing faults with a fall of ~1 ms
Use of technology
o Resource exploration and geological surveys
- Exploration of resources such as submarine aggregate and gas hydrate
- Detailed investigation of subsurface geology
o Engineering exploration
- Investigation of site survey at oil drilling sites, nuclear power plants and waste storage facilities
- Ground exploration for the construction of bridges and port facilities
- Ground survey of CO2 geological storage facilities
- Submarine cable route selection investigation
o Geological disaster prevention exploration
- Exploration to identify the distribution of active faults in preparation for earthquakes
- Exploration to find out the distribution of submarine slump
Swell effect correction
- The quality was greatly improved by applying the swell effect correction technology to the high-resolution seismic survey data containing noise (Lee et. al., 2021)
- Swell effect correction technology: Considering the source-receiver arrangement, select a reliable sea bottom location within the expected range of a hyperbolic shape from shot gather to correct the swell effect
![[크기변환]Fig22.png](https://static.wixstatic.com/media/0a50e7_0c4fd8f2493b4061bf74b74aaffc3878~mv2.png/v1/fill/w_430,h_392,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/%5B%ED%81%AC%EA%B8%B0%EB%B3%80%ED%99%98%5DFig22.png)
The swell effect correction effect using the hyperbolic method. (a) is the data without correction for the swell effect. (b) is the result of correcting the swell effect for each trace. (c) is the result of one channel corrected for the swell effect using the hyperbolic method for 8-channel data. (d) is the result of stacking after correcting the swell effect using the hyperbolic method for 8-channel data
References
Lee, Ho-Young, Hyun, Byung-Koo and Kong, Young-Sae, 1996, PC-based acquisition and processing of high-resolution marine seismic data. Geophysics, 61, 1804-1812.
Lee, Ho-Young, Kim, Wonsik, Koo, Nam-Hyung, Park, Keun-Pil, Yoo, Dong-Geun, Kang, Dong-Hyo, Kim, Young-Gun, Seo, Gab-Seok and Hwang, Kyu- Duk, 2014, Resolution analysis of shallow marine seismic data acquired using an airgun and an 8-channel streamer cable. Journal of Applied Geophysics, 105, 203-212.
Lee, Ho-Young, Koo, Nam‑Hyung, Kim, Byoung‑Yeop, Kim, Young‑Jun, Son, Woohyun, Joo, Yonghwan, 2021, Pre‑stack sea bottom detection and swell correction within an expected hyperbolic range for noisy high-resolution 8-channel airgun seismic data. Marine Geophysical Research, 42:9, 1-21.
Lee, Ho-Young, Park, Keun-Pil, Koo, Nam-Hyung, Yoo, Dong-Geun, Kang, Dong-Hyo, Kim, Young-Gun, Hwang, Kyu-Duk and Kim, Jong-Chon, 2004. High-resolution shallow marine seismic surveys off Busan and Pohang, Korea using a small-scale multichannel system. Journal of Applied Geophysics, 56, 1–15.