建场测深法在新疆布尔津盆地油铀勘探中的应用

Application of the Field Sounding Method to Oil-Uranium Exploration in the Burqin Basin of Xinjiang

为明确位于新疆北部的布尔津盆地的资源状况,以实际采集数据为基础,采用建场测深法成果剖面研究了该盆地的地层地质结构,并对深层油气及浅部砂岩型铀矿进行评价。通过利用已知测井电阻率曲线模拟计算不同深度的电磁信号频率响应,论证了该方法探测从浅层第三系到深部石炭系的采集参数和工作方案;在数据处理成果的基础上,结合研究区已知地层物性特征,推断沿线的地质结构,揭示了布尔津凹陷的结构及下二叠统卡拉岗组、上石炭统哈尔加乌组、上石炭统恰其海组地层的分布,认为哈尔加乌组是本区有潜力的烃源岩。同时利用电阻率及双频相位属性对研究区浅部第三系砂岩型铀成矿条件进行分析,其结果与附近已知矿点情况吻合。本文提出的方法可为类似地区进行多种矿产资源勘探提供技术参考。

In order to determine the resource status of the Buerjin Basin in northern Xinjiang,this work studied the stratigraphic geological structures of this basin on the basis of actual collected data,and evaluated the deep oil and shallow sandstone-type uranium deposit.Known logging resistivity curves were utilized to simulate and calculate the electromagnetic signal frequency response at different depths,and the acquisition parameters and working scheme of this method for probing from shallow Tertiary to deep Carboniferous were demonstrated.On the basis of the data processing and the known stratigraphic physical characteristics of the study area,the geological structures along the line were inferred,which reveal the structures of the Buerjin Depression and the distribution of the Lower Permian Kalagang Formation,Upper Carboniferous Harjiawu Formation and Upper Carboniferous Chaiqihai Formation.The Harjiawu Formation is inferred to be a potential source rock in this area.The metallogenic conditions of Tertiary sandstone-type uranium in the shallow part of the study area were analyzed by resistivity and dual-frequency phase attributes.The results are in agreement with the known ore spots nearby.This proposed method provides technical reference for the exploration of various mineral resources in other areas.