o 음원파형을 실측, 분석함으로써 고해상 탄성파 탐사 음원의 품질을 검증함. o 다중채널 수신장비의 정량적인 신호분석이 국내 최초로 수행되어 다중채널 축소배열의 적정성을 입증하고 적적매개변수를 도출함. o PC 기반의 디지털 자료기록 시스템 디자인, 하드웨어 구성 및 소프트웨어를 개발하고, 실제 현장탐사에 적용하여 고품질 자료를 취득함으로써 탐사기술을 자립화였음. o 탐해2호와 소형선박을 이용한 음원 및 수신장비 배열 현장시험과 시험측선탐사를 수행하고, 취득된 자료의 해석을 통하여 개발 성과를 검증하였음. o 음원파형시험 및 스트리
o 음원파형을 실측, 분석함으로써 고해상 탄성파 탐사 음원의 품질을 검증함. o 다중채널 수신장비의 정량적인 신호분석이 국내 최초로 수행되어 다중채널 축소배열의 적정성을 입증하고 적적매개변수를 도출함. o PC 기반의 디지털 자료기록 시스템 디자인, 하드웨어 구성 및 소프트웨어를 개발하고, 실제 현장탐사에 적용하여 고품질 자료를 취득함으로써 탐사기술을 자립화였음. o 탐해2호와 소형선박을 이용한 음원 및 수신장비 배열 현장시험과 시험측선탐사를 수행하고, 취득된 자료의 해석을 통하여 개발 성과를 검증하였음. o 음원파형시험 및 스트리머 배열에 따른 최적 탐사배열을 도출함. o 8채널, 0.1 msec sample interval 이동형 실시간 탐사 시스템을 개발하고, 자료기록 및 자료처리 소프트웨어를 개발함. o 개발된 탐사시스템을 이용한 현장시험탐사에서 음원 및 수신장비 배열시험 및 측선탐사를 수행하고, 취득자료를 해석하고 해상도를 평가한 결과 가탐심도 60m에서 수평해상도 2.5m, 수직해상도 ~1m의 정밀도를 달성하여 국내 최초의 고해상 다중채널 디지털 해저 탄성파 탐사기술을 개발함.
Abstract▼
A high-resolution miltichannel shallow marine seismic survey was designed to improve the quality of seismic data. Test surveys were carried out offshore Korea. To verify the source quality, we recorded the source signatures and analyzed the signal. To achieve high vertical resolution considering pen
A high-resolution miltichannel shallow marine seismic survey was designed to improve the quality of seismic data. Test surveys were carried out offshore Korea. To verify the source quality, we recorded the source signatures and analyzed the signal. To achieve high vertical resolution considering penetration depth, a single air gun was selected as a seismic source. To receive high frequency reflected wave, 6 and 8 channel of high resolving power streamer cable were used. Seismic signals were recorded, processed and analyzed using a PC. To improve the quality of high-resolution seismic data and record digital multichannel seismic data economically, we have developed a first stage of PC-based multichannel digital acquisition and processing system, KIGAM Data Acquisition and Processing System(KDAPS). The system includes an analog to digital(A/D) converter and screw terminal panel. The input parameters of the system are the number of channels, sampling interval, record length, and digital gain. The recording format is SEGY. Test field surveys were carried out off Busan, Pohang, Yeosu and Incheon offshore Korea. In the Busan and Yeosu survey, R/V Tamhae II of Korea Institute of Geoscience and Mineral Resources(KIGAM) seismic vassel was used. In the Pohang and Incheon survey, a small boat was used. The seismic source was a 10 or 30 $in^3$ air gun and the receiver was a 6, 8 or 96 channel streamer cable respectively. The group interval of 6 and 8 channel streamer cables was 5 m and that 96 channel streamer cable was 6.25m. The gun depth was 1~3 m. For data processing, we applied only basic conventional processing steps to the acquired data. The processing sequence included gain recovery, deconvolution, frequency filtering, normal moveout(NMO) correction, commmon midpoint(CMP) sorting, gun delay correction and static corrections. Deconvolution is the most effective in improving the quality of the high-resolution seismic data. The reflectors in the section with deconvolution are sharper and clearer than those of the section without deconvolution. To suppress the swell effect, the depths of sea bottom were calculated first. And the depths of adjacent traces were averaged to suppress the swell effect which has relatively high frequency component in comparison with se bottom variation. The section with satic corrections show a better continuity than the section without static corrections.
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