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

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.