한국해양대학교

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가우스-뉴턴법을 이용한 탄성파 단일 트레이스 역산 알고리즘 개발 및 적용

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dc.contributor.author 최연진 -
dc.date.accessioned 2017-02-22T05:20:25Z -
dc.date.available 2017-02-22T05:20:25Z -
dc.date.issued 2015 -
dc.date.submitted 57069-08-26 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174513 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/8555 -
dc.description.abstract In this study, a seismic single trace inversion algorithm was developed to build a subsurface velocity model using waveform inversion. The existing single trace inversion algorithm is conducted based on the convolution theory. In contrast, the proposed algorithm assumes that the subsurface velocity model is one-dimensional, and utilizes the Gauss-Newton method to build a velocity model. To develop the algorithm, a numerical modeling algorithm based on the staggered grid finite difference method was applied, and the virtual source term was defined to calculate the Hessian matrix. In addition, the seismic source estimation technique was used. The validity of the proposed algorithm was verified through numerical tests using the Marmousi2 model. First, the numerical test using post-stack data was conducted. In this test, an inverted velocity model was built using the proposed algorithm, and the algorithm was compared with the post-stack inversion algorithms of the Hampson-Russell software. As a result, the proposed algorithm seems to yield better results than the existing algorithms. Next, a numerical test was conducted to investigate the effect of offset. For such purpose, numerical modeling data obtained by a single channel were used. As a result, a reliable result within 10m offset was confirmed. Finally, the algorithm was applied to the field dataset obtained from Busan Port to build a velocity model, and the proposed algorithm was found to be applicable to field data. -
dc.description.tableofcontents 1. 서 론 2. 단일 탄성파 트레이스 역산 알고리즘 개발 2.1 엇격자 유한차분법을 이용한 수치모델링 2.2 경계 조건 2.3 가우스-뉴턴법을 이용한 탄성파 파형역산 2.4 가상음원을 이용한 편미분파동장 계산 2.5 음원추정 알고리즘 2.6 개발된 탄성파 단일 트레이스 역산 알고리즘 검증 3. 중합 후 탄성파 자료에 대한 알고리즘 적용 3.1 탄성파 관측자료 생성 3.2 탄성파 자료처리 3.3 개발된 단일 탄성파 트레이스 역산 알고리즘 적용 3.4 기존 중합 후 파형역산 알고리즘 적용 3.4.1 bandlimited inversion 3.4.2 model based inversion 3.4.3 colored inversion 3.5 개발된 알고리즘과 기존 알고리즘의 결과 비교 4. 단일채널 탄성파 탐사 자료에 대한 적용 4.1 수치모델링 자료에 대한 알고리즘 적용 4.1.1 수치모델링 자료 생성 4.1.2 알고리즘 적용 결과 4.2 현장 관측자료에 대한 알고리즘 적용 4.2.1 현장 관측자료 취득 및 처리 4.2.2 알고리즘 적용 결과 5. 결론 -
dc.language kor -
dc.publisher 한국해양대학교 대학원 -
dc.title 가우스-뉴턴법을 이용한 탄성파 단일 트레이스 역산 알고리즘 개발 및 적용 -
dc.title.alternative Development and Application of Seismic Single Trace Inversion Algorithm using Gauss-Newton Method -
dc.type Thesis -
dc.date.awarded 2015-02 -
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해양에너지자원공학과 > Thesis
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