元素录井定量化岩性识别技术在丽水-椒江凹陷潜山中的应用

Application of Quantitative Lithology Identification Technology of Element Logging in Buried Hill of Lishui-Jiaojiang Sag

韩学彪 王雷 袁胜斌 陈伟

HAN Xuebiao WANG Lei YUAN Shengbin CHEN Wei

中法渤海地质服务有限公司，天津　300452 中海石油（中国）有限公司上海分公司，上海　200335

China−France Bohai Geoservices Co., Ltd., Tianjin 300452, China Shanghai Branch, CNOOC (China) Limited, Shanghai 200335, China

潜山勘探作为丽水-椒江凹陷的重点领域之一，随着潜山勘探的不断深入，钻遇的潜山岩性越来越复杂，加上钻井速度越来越快，给随钻岩性快速准确识别带来了困难，导致作业安全和时效性无法得到保障。该研究基于X射线元素录井（XRF）资料，应用数理统计及数据降维的分析理论，建立了研究区多手段潜山岩性定量化识别方法：首先通过ω(Fe+Mg)-ω(Na+K)交会图版快速准确进行现场潜山岩性初步划分；然后通过TAS图版对岩浆岩进一步细化分类；最后基于线性判别（LDA）降维分析对研究区四种主要岩性进行三维立体识别。通过建立潜山岩性多手段识别方法，从而达到潜山基底岩性随钻快速定量化识别评价的目的。

As one of the key areas of Lishui-Jiaojiang Sag, with the deepening of buried hill exploration, the lithology is more and more complex, and the drilling speed is getting faster and faster, which brings difficulties to the rapid and accurate identification of lithology while drilling, resulting that the safety and timeliness of operation cannot be guaranteed. Based on XRF data, the theory of mathematical statistics and dimensionality reduction, this study established a multi-means quantitative identification method for buried hill lithology in the study area. Firstly, the initial classification of buried hill lithology was performed quickly and accurately by using the ω(Fe+Mg)-ω(Na+K) crossplot. Then magmatic rocks were further classified by TAS chart. Finally, based on linear discrimination (LDA) dimension reduction analysis, three dimensional identification of four main lithologies in the study area was carried out. By establishing a multi-means identification method of buried hill lithology, the purpose of rapid quantitative identification and evaluation of basement lithology while drilling can be achieved.

中国海洋石油有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术”（编号：KJGG2022-0405）。

https://doi.org/10.3969/j.issn.1008-2336.2023.02.052