CAJ | 학술논문

近年在内蒙古二连盆地赛汉组中找到了可观的砂岩型铀矿资源.关于早白垩世赛汉组的分段没有统一的认识,严重影响了铀矿勘查工作的布置.利用石油、煤炭和核工业部门勘查钻孔岩性、测井曲线、综合编录、地震剖面等资料,结合古气候-颜色变化、沉积序列变化反映的沉积环境,将赛汉组划分为4段.赛汉组一段,主要为一套冲积扇(或扇三角洲)环境下的杂色粗碎屑岩组合.二段为一套凹陷中心灰色、黑色湖沼环境下的泥岩夹褐煤层,凹陷边缘为杂色扇三角洲粗碎屑岩,总体以黑色岩系组合为特征.三段为一套灰色、深灰色含砾粗砂岩、砂岩,侧向联通性较好的灰色岩系组合,形成于辫状河环境.四段为一套红色、黄色泥岩与砂岩互层的红色岩系或组合,沉积于曲流河环境.二连盆地马尼特坳陷中砂岩型铀矿形成于三段中,为侧向氧化成矿作用所致;而乌兰察布坳陷铀矿化定位于四段中,为垂向潜水氧化成矿作用所造成,一段和二段目前还没有找到有价值的铀矿化.
근년재내몽고이련분지새한조중조도료가관적사암형유광자원.관우조백성세새한조적분단몰유통일적인식,엄중영향료유광감사공작적포치.이용석유、매탄화핵공업부문감사찬공암성、측정곡선、종합편록、지진부면등자료,결합고기후-안색변화、침적서렬변화반영적침적배경,장새한조화분위4단.새한조일단,주요위일투충적선(혹선삼각주)배경하적잡색조쇄설암조합.이단위일투요함중심회색、흑색호소배경하적니암협갈매층,요함변연위잡색선삼각주조쇄설암,총체이흑색암계조합위특정.삼단위일투회색、심회색함력조사암、사암,측향련통성교호적회색암계조합,형성우변상하배경.사단위일투홍색、황색니암여사암호층적홍색암계혹조합,침적우곡류하배경.이련분지마니특요함중사암형유광형성우삼단중,위측향양화성광작용소치;이오란찰포요함유광화정위우사단중,위수향잠수양화성광작용소조성,일단화이단목전환몰유조도유개치적유광화.
A number of sandstone-type uranium deposits have been found in the Lower Cretaceous Saihan Formation of Erlian Ba-sin. The segmentation of the Saihan Formation has impact on exploration to some extent. Core observation, logging, seismic profile and comprehensive core documentation show that the Saihan Formation can be divided into four intervals, i.e., Ⅰ(K1bs1),Ⅱ(K1bs2),Ⅲ(K1bs3) and Ⅳ(K1bs4). K1bs1 consists of variegated coarse-grained clastic rocks deposited in alluvial fan. K1bs2 consists of gray or dark gray or dark mudstones and coal beds deposited in swamps and muddy lakes. K1bs3 consists of gray coarse-grained clastic rocks like conglomeratic sandstones deposited in a braided river environment. K1bs4 consists of yellow sandstones interbedded with red mud-stones deposited in a meandering river environment. The target layer for sandstone-type uranium mineralization is interval Ⅲ in the Manitesubbasin and intervalⅣin the Wulanchabusub basin. No uranium mineralization has been discovered in intervalⅠand Ⅱ up till now.