三维地震勘探技术在松辽盆地HLJ地区砂岩型铀矿勘查中的应用

Application of 3D Seismic Exploration Technology in Searching Sandstone Uranium Deposit in HLJ Area of Songliao Basin

三维地震勘探相较二维地震勘探能够更准确地反映目标地质体的三维立体形态,勘查实践表明,通过三维地震查明勘查区的三维地质结构和岩性发育特征,分析砂岩型铀矿的铀成矿条件,可以为研究区的铀矿勘查提供依据。通过在松辽盆地西南部HLJ地区开展三维地震勘探工作,重点研究了研究区姚家组的埋深、地层厚度和岩性发育情况,共划分出A、B、C三套“泥-砂-泥”地层,并优选了B套地层为铀成矿有利层位,其底板埋深约为605~635 m,厚度约为80~100 m,进一步优选了研究区南部为铀成矿有利区域,区域内砂体厚度约为25~30 m,砂地比约为0.3~0.4,“泥-砂-泥”地层空间上稳定发育,可为铀成矿提供较好的岩性环境。

Compared with 2D seismic exploration,3D seismic exploration technology can more accurately reflect the 3D shape of the target geological body.Exploration examples show that 3D seismic exploration technology can identify the 3D geological structure and lithological development characteristics of the exploration area,and analyzed the uranium metallogenic conditions of sandstone uranium deposits,which can provide a basis for the uranium exploration in the study area.This paper focused on the burial depth,stratigraphic thickness and lithology development of the Yaojia Formation in the exploration area by carrying out 3D seismic exploration in HLJ area in the southwest of the Songliao Basin,and three"mud-sand-mud"lithology combination A,B,and C were divided,and the combination B was selected as a favorable target layers for uranium mineralization,the depth of the bottom plate is about 605~635 m,and the thickness of combination B is about 80~100 m.The southern part of the study area was further optimized as a favorable area for uranium mineralization,the thickness of sand bodies in the area is about 25~30 m,the sand-ground ratio is about 0.3~0.4,and the"mud-sand-mud"combination are stably developed,which can provide a better lithological environment for uranium mineralization.