甲玛矿集区三维地质模型

西藏甲玛矿区是冈底斯成矿带中非常典型的多金属矿床，理论预测研究认为在矿集区深部发育隐伏的斑岩-矽卡岩矿体，而基于矿区钻孔覆盖的勘查模型对外围区潜在靶区预测程度较低。本文以甲玛矿区45口钻孔岩芯的密度、磁性、电阻率和极化率等物性资料为基础，反演分析了覆盖甲玛矿集区及外围的大地电磁测深三维数据体，基于GOCAD软件平台，通过离散光滑插值法与随机模拟算法，构建了甲玛矿区的地层岩性-地球物理三维可视一体化模型；结合大地电磁测深11条剖面的二维地质解译成果，精细刻画了3000m以浅的三维矽卡岩体发育特征，并通过使用未参与建模的甲玛科学深钻JMKZ-1井进行验证，结果显示三维地质模型具有较好一致性；基于构建的矽卡岩成矿模型，结合甲玛矿区及邻区岩（矿）石电性参数特征分析和三维矽卡岩的电性结构，预测了甲玛矿区的层状矽卡岩靶区，为深部资源潜力评价及矿集区增储目标提供三维建模技术示范。

The Tibet Jiama Mining Area is a typical polymetallic deposit in the Gangdise Metallogenic Belt. Theoretical prediction studies suggest that concealed porphyry-skarn ore bodies develop in the deep part of the ore concentration area, while the exploration model based on borehole coverage in the mining area has low prediction accuracy for potential targets in the peripheral areas. Based on the physical property data including density, magnetic susceptibility, resistivity and polarizability of 45 borehole cores from the Jiama Mining Area, this study inverted and analyzed the 3D magnetotelluric sounding data covering the Jiama ore concentration area and its periphery. Using the GOCAD software platform, an integrated 3D visualization model of stratigraphic lithology-geophysics for the Jiama Mining Area was constructed through discrete smooth interpolation and stochastic simulation algorithms. Combined with the 2D geological interpretation results of 11 magnetotelluric sounding profiles, the development characteristics of 3D skarn ore bodies shallower than 3000 m were finely characterized. Verification was conducted using the Jiama Scientific Deep Drilling Well JMKZ-1 that did not participate in modeling, and the results showed good consistency with the 3D geological model. Based on the constructed skarn metallogenic model, combined with the analysis of electrical parameter characteristics of rocks (ores) in the Jiama Mining Area and its adjacent areas, and the electrical structure of the 3D skarn, the layered skarn target areas in the Jiama Mining Area were predicted, providing a 3D modeling technical demonstration for deep resource potential evaluation and the reserve-increasing goal of the ore concentration area.

搜集汇总

背景与挑战

背景概述

该数据集是西藏甲玛矿集区的三维地质模型，基于45口钻孔岩芯的物性资料和大地电磁测深数据构建，用于深部资源潜力评价和矿集区增储目标预测。数据大小为1.96 GB，时间范围为2019-2021年，空间分辨率为100m - 1km。