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논문

시추코어 검층자료와 탄성파 다중속성자료의 상관분석을 통한 대한해협 천부 퇴적층 밀도분포 도출

Derivation of Density Distribution in Korean Strait Shallow Sediment through Correlation Analysis of Drill Core Logs and Seismic Multi-attribute Data

윤병준|이광수|유동근|최윤석|김길영|손우현|박기주|정순홍
한국자원공학회 (The Korean Society of Mineral and Energy Resources Engineers)|2024.06|한국자원공학회지 (Journal of the Korean Society of Mineral and Energy Resources Engineers)|제61권 제3호|pp. 242-255|DOI 10.32390/ksmer.2024.61.3.242

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참고문헌

키워드

다중 속성밀도 로그시추코어탄성파 단면상관 수치density logdrill coreseismic sectionmulti-attributescorrelation values
주제분류자원공학

초록

퇴적층의 밀도 분포를 파악하는 경우 지층 내부 유체 집적양상을 유추할 수 있어 공학적인 활용도가 높다. 지층 시추코어로부터 퇴적층의 속도와 밀도 등의 물성 정보를 얻을 수 있으며, 물성의 수평방향 변화양상을 유추하기 위하여 탄성파 탐사와 같은 추가정보가 필요하다. 본 연구에서는 대한해협 천부 지층에서 획득한 시추코어의 실험실 분석 밀도자료와 2차원 탄성파 자료를 통합 분석하였다. 통합 분석의 정확도는 밀도 로그와 탄성파 자료에서 도출한 속성의 상관 수치를 계산하여 평가하였다. 단일 속성, 다중 속성 및 다중 속성 곱말이 연산자와 밀도의 상관계수는 각각 52, 69 및86%였다. 따라서 밀도 분포를 정확히 추정하기 위하여 탄성파 자료로부터 다중 속성을 도출한 후, 곱말이 연산자를 적용하는 것이 효과적이었다. 상관 분석 결과는 2차원 탄성파 단면의 수평 공간에확장되어, 천부 퇴적층의 밀도 분포 양상이 지층 단면으로 도출되었다. 밀도 단면을 확인한 결과 대한해협 천부 퇴적층에서 저밀도 영역을 확인하였고, 이는 염수 또는 천부 가스의 집적으로 인한 현상으로 추정된다.

Abstract

The density distribution of a sedimentary layer can reveal fluid accumulation patterns, which are highly valuable for engineering purposes. Density information can be obtained from logs while drilling or through laboratory experiments on drill cores. To extend the density log to a broader regional area, seismic data can be utilized. In this study, density data analyzed in the laboratory from drill cores and seismic data from the Korea Strait were integrated. The correlation between density logs and seismic attributes was calculated to evaluate the accuracy of the analysis. The correlation values for single attributes, multi-attributes, and convolution of multi-attributes were 52%, 69%, and 86%, respectively. Therefore, applying the convolutional operator to seismic multi-attributes is recommended for evaluating the density distribution of sediment. The result were extended to a two-dimensional seismic section, identifying low-density areas in the shallow sedimentary layer, presumed to indicate the accumulation of fluid or shallow gas.

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