니켈 라테라이트 광상에서 MWD 자료를 이용한 암상 경계 추정
Lithofacies Boundary Estimation with MWD data in Nickel Laterite Deposits
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초록
니켈 라테라이트 광상의 시추 조사 과정에서 획득한 MWD 자료에 대한 경향성 및 상관관계분석을통해 광상을 구성하는 주된 암상인 리모나이트와 사프로라이트, 그리고 기반암의 경계를 추정하였다. 동일한 시추공에서 획득된 MWD 자료 중 지층 굴진 과정에서 측정된 자료만을 추출하여 암상경계 추출에 사용하였다. 사프로라이트와 기반암의 경계는 시간별 굴진거리의 추세선 기울기로부터 계산된 평균 굴진 속도의 변화 양상을 이용하여 추정하였다. 리모나이트와 사프로라이트의 경계는 MWD 자료 중 암상별로 상관관계값의 부호가 다른 ‘들어올리는 압력’과 ‘회전 압력’ 자료를이용하여 추정하였다. MWD 자료를 이용한 암상 경계 추정 결과를 실험실 XRF 분석 결과를 이용하여 도출한 암상 분류 결과와 비교함으로써, 현장에서 측정된 MWD 자료를 이용한 암상 경계면추정 방법의 유효성을 검토하였다.
Abstract
The boundaries between limonite, saprolite, and bedrock, typifying the main lithofacies of nickel laterite deposits, were estimated by analyzing the trend and correlation of measurement while drilling (MWD) data obtained during drilling in the deposit. The MWD data corresponding to the drilling work were used to estimate the boundaries. The boundary between the saprolite and bedrock was estimated using the change in the average penetration rate, calculated from the slope of the trend line of the drilling distance over time. The boundary between limonite and saprolite was estimated using “pressure-lift” and “pressure-rotate” data from MWD data, where the sign of the correlation value varied by lithofacies. By comparing the results of the lithofacies boundary estimation using MWD data with those of laboratory X-ray fluorescence analysis, the applicability of the reported method for estimating the lithofacies boundary using MWD data acquired during field exploration was validated.
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