煤田测井在砂岩型铀矿勘查选区中的应用

辽北煤盆地砂岩型铀矿的形成与煤盆地再生改造密切相关,且多位于煤盆地的边缘及断裂的斜坡区。通过对4556个钻孔自然伽马测井曲线异常的筛选,研究确定辽北煤盆地砂岩型铀矿勘查选区。在选区工作中,依据测井曲线自然伽马异常幅值与铀含量正相关关系,确定研究区内异常范围按50γ~100γ、101γ~350γ、大于351γ三个数值段分别统计;通过对伽马高异常岩性的分析,确认含煤盆地内白垩系上统泉头组砂岩、砂砾岩段为主要含铀岩层;根据各煤田异常孔、异常点、异常深度、异常厚度以及伽马异常值大小,圈定了3个砂岩型铀矿勘查选区,即辽宁北部的长城窝堡、铁法、古榆树——亮中远景区。

Application of Coalfield Logging in Sandstone Type Uranium Deposit Exploration Target Optimization in Northern Liaoning Coal Basins

The formation of sandstone type uranium deposit in northern Liaoning coal basins is closely related with coal basin palingenesis and modification, mostly located on the coal basin marginal and fault slope areas. Through sifted out gamma-ray logging anomalies in 4556 boreholes, have studied to determine optimized exploration targets. In the optimization, based on positive relationship between logging trace gamma-ray anomaly amplitude and uranium content, determined to account anomalous range in study area into 3 segments of 50γ~100γ, 101~350γ and〉 351γ. Through analysis of high γ anomalous rocks, have validated the upper Cretaceous Quantou Formation sandstone, sandy conglomerate members are main uranium-bearing strata. According to anomalous boreholes, points,depths, thicknesses and γ anomalous values in coalfields, three sandstone type uranium exploration prospect areas have been delineated out, they are Changchengwopu area,Tiefa area and Guyushu-Liangzhong area in northern Liaoning.