基于松辽盆地南部地震剖面中地质信息的砂岩型铀矿找矿预测方法研究  

A Study on the Prospecting and Prediction Method for Sandstone Type Uranium Deposits Based on Geological Information from Seismic Sections in the Southern Songliao Basin

作　　者：刘鑫 姜山[1] 高天栋[1] 宁君[1] 马树松 LIU Xin;JIANG Shan;GAO Tiandong;NING Jun;MA Shusong(Geological Party No.243,CNNC,Chifeng,Inner Mongolia 024000,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000

出　　处：《铀矿地质》2024年第3期522-539,共18页Uranium Geology

基　　金：中国核工业地质局项目“松辽盆地通辽-大庆地区铀矿资源调查评价与勘查”(编号:202212)资助。

摘　　要：砂岩型铀矿勘查队伍在进行铀矿勘查的过程中收集了大量勘查区内地震剖面,部分地震剖面中隐藏的地质信息未得到充分发掘,文章从地质、物探相结合的研究视角,依托历年铀矿勘查工作经验对收集的地震剖面进行综合分析和二次开发利用,提高地震资料利用率,进一步发挥地震资料在砂岩型铀矿勘查过程中的指导作用。在地震剖面中识别构造、沉积等要素,将各类要素投影至平面图中进行叠合并筛选,进而确定铀成矿有利部位。该找矿预测方法综合反转与走滑构造预测成果、辫状河砂体预测成果、削截不整合预测成果、隆起构造预测成果、洼地预测成果,以岩性地化环境作为控制性指标,结合周围钻孔单孔、连孔信息,实现对铀成矿有利砂体的预测。文章提出松辽盆地南部坳陷期沉积地层处于右旋走滑构造背景下,走滑断裂的局部地区形成挤压应力场造成反转构造,进而形成了古隆起,这一过程同时伴生形成拉伸应力场,进而形成了深洼地,古隆起和深洼地之间过渡带形成一系列发育辫状河的山间河谷地形,应力场的转换形成一系列不整合界面和局部隆起构造,控制了铀矿化的具体位置,其能否最终形成富矿体取决于该具体位置是否处于氧化—还原的过渡带。文章预测了13片外围铀成矿潜力较大且可供下一步钻探工程查证的砂体,预测结果与部分外围铀矿体位置一致,在其中两片有利砂体附近勘查发现两处铀矿产地。文中基于地震剖面中地质信息的找矿预测方法对铀矿找矿具有一定指导和借鉴意义。During the uranium exploration process,a large number of seismic profiles were collected for the the sandstone type uranium deposit in the southern Songliao Basin.Some implicit geological information in the seismic profiles was not fully excavated.This article,from the perspective of geology and geophysical exploration based on past uranium exploration experience comprehensively analyzed and secondary developed the collected seismic profiles to improve the utilization rate of seismic data,Further leverage the guiding role of seismic data in the exploration of sandstone type uranium deposits.The author identified the structural and sedimentary elements in seismic profiles,projected the various elements onto a plan for stacking and screening,and then determined the favorable locations for uranium mineralization.The prospecting prediction method combined the predicted results of inversion and strike slip structure,braided river sand body,unconformity surface,uplift structure,and depression.The lithology and geochemical environment are used as the control indicators,combined with the information of surrounding single and continuous boreholes,to achieve the prediction of favorable sand bodies for uranium mineralization.The article proposed that the sedimentary strata in the southern depression of the Songliao Basin were located in the context of a dextral strike slip structure.The local areas of the strike slip fault formed a compressive stress field,resulting in a reverse structure and the formation of an ancient uplift.This process was accompanied by the formation of a tensile stress field,resulting in the formation of deep depressions.The transition zone between the ancient uplift and the deep depressions formed a series of mountain valley terrains with braided rivers,the transformation of stress field formed a series of unconformity interfaces and local uplift structures,which controlled the specific location of uranium mineralization.Whether rich ore body will ultimately form or not depends on the specific locati

关 键 词：松辽盆地南部 铀矿找矿 地震剖面 成矿要素预测 

分 类 号：P631[天文地球—地质矿产勘探]