甲玛3千米地球物理测井数据（2021）

对甲玛矿区科研深钻JMKZ-1开展地球物理测井，查明矿区主要地质体的物性特征，根据测井曲线划分岩性界面，确定矿（化）体深度和厚度，结合地面物探资料解译深部与成矿关系密切的地层、岩体、矿（化）体及构造的分布特征。运用井温测井资料，统计分析全孔段地层温度的变化规律。对科研深钻JMKZ-1未下套管的1080m以下进行地球物理测井工作，测井参数包括三侧向电阻率、极化率、磁化率、自然伽玛、自然电位和井温等。通过多种参数相结合，基本查明了矿区主要地质体的物性特征，确定了矿（化）体深度和厚度，运用井温测井资料，统计分析了全孔段地层温度的变化规律。从全孔段来看，岩性变化由下向上由花岗斑岩-矽卡岩-硅化角岩变化，含矿性由下部花岗斑岩局部弱矿化-巨厚矽卡岩型矿体-上部局部角岩型矿体。这种变化特征反映了含矿斑岩由深部向上侵位过程中，在深部斑岩型矿化形成斑岩型矿体或矿化体，向上侵位在和角岩的接触面形成矽卡岩型巨厚富矿体，侵位过程中挤压岩层导致角岩内裂隙发育，含矿热液沿裂隙运移在角岩中形成局部角岩型矿体。

Geophysical logging was conducted on the scientific deep drilling borehole JMKZ-1 in the Jiama mining area, aiming to identify the physical property characteristics of the main geological bodies in the mining area, divide lithologic boundaries via logging curves, determine the depth and thickness of ore (mineralized) bodies, and interpret the distribution characteristics of deep strata, rock masses, ore (mineralized) bodies and structures closely associated with mineralization by integrating surface geophysical data. Temperature logging data were utilized to statistically analyze the variation regularities of formation temperature across the entire borehole section. Geophysical logging was performed on the section below 1080m of borehole JMKZ-1 where no casing was installed, with logging parameters covering triaxial lateral resistivity, polarizability, magnetic susceptibility, natural gamma ray, spontaneous potential, and borehole temperature, among others. By integrating multiple logging parameters, the physical property characteristics of the main geological bodies in the mining area were basically clarified, the depth and thickness of ore (mineralized) bodies were confirmed, and the variation regularities of formation temperature along the entire borehole were statistically analyzed using the temperature logging data. Across the entire borehole section, the lithology changes vertically in the sequence of granite porphyry → skarn → silicified hornfels from bottom to top; correspondingly, the mineralization potential evolves from local weak mineralization in the lower granite porphyry, to extremely thick skarn-type ore bodies, then to local hornfels-type ore bodies in the upper part. This vertical variation pattern indicates that during the upward emplacement of the ore-bearing porphyry from the deep crust, porphyry-type ore bodies or mineralized zones were formed in the deep part via porphyry-style mineralization. When the magma emplaced upward to the contact interface with hornfels, extremely thick skarn-type high-grade ore bodies were generated. During the emplacement process, the extruded rock strata developed abundant fractures in the hornfels, and ore-bearing hydrothermal fluids migrated along these fractures to form local hornfels-type ore bodies within the hornfels.

搜集汇总

背景与挑战

背景概述

该数据集包含2021年在西藏甲玛矿区对JMKZ-1科研深钻1080米以下未下套管部分进行的地球物理测井数据，测井参数包括三侧向电阻率、极化率、磁化率、自然伽玛、自然电位和井温等，旨在查明矿区地质体物性特征、确定矿体深度和厚度，并分析地层温度变化规律。数据具有1米至10米的空间分辨率，总大小为10.03 MB，通过申请获取方式共享，适用于固体地球科学和矿产勘探研究。