| 内蒙古二连盆地中部古河道型铀矿床中
烃类流体特征与铀成矿关系 |
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| 关键词:hydrocarbon fluid sandstone-type uranium mineralization characteristics of uranium mineralization paleo-channel central Erlian basin |
| 基金项目:中国铀业有限公司科研项目“柴达木盆地砂岩型铀矿成矿环境分析及远景预测”项目(编号: 201829-2);中核集团集中研发项目“二连盆地深部层位铀成矿关键地质问题研究与靶区优选”项目(编号: 地LTD1601-1) |
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| 摘要: |
| Relationship between Uranium Mineralization and Hydrocarbon Fluids Characteristics in Paleo-channel Uranium Deposits of Central Erlian Basin, Inner Mongolia |
| Based on analyzing the characteristics of acidolytical hydrocarbon in sandstones of the paleo-channel uranium deposits in the upper section of Lower Cretaceous Saihan Formation in central Erlian basin, the authors investigated the hydrocarbon composition, origin and source of the hydrocarbons in the acidolytical hydrocarbon. Besides, combined with distribution and enrichment geological characteristics of uranium deposits in this area, the authors preliminarily explored the relationship between sandstone-type uranium mineralization and oil-gas in this area. The results show that, in sand body of the upper section of Saihan Formation, content of CH4 and C2+ is positively proportional to uranium content, whereas in the oxidation zone, the redox transition zone and the reduction zone, hydrocarbon content develops with obvious zonation. Gas composition characteristic parameters of acidolytical hydrocarbon, i.e., C1/ΣC, C1/C2+, C2/iC4, C2/C3, iC4/nC4, iC5/nC5, ln(C1/C2), and ln(C2/C3), show that hydrocarbon gas developed in sand body of the upper section of Saihan Formation is organically formed oil-type gas mainly in the high maturity maturation stage, and is mainly composed of crude oil associated gas and crude oil cracked gas. According to geochemical characteristics of source rock and analysis of hydrocarbon generation and expulsion history, it can be inferred that hydrocarbon gas in paleo-channel uranium deposit developed in upper section of Lower Cretaceous Saihan Formation is mainly generated from Lower Cretaceous Aershan Formation (K1ba) lacustrine sapropel or partial sapropel source rock, followed by 1st section of Tenggeer Formation (K1bt) low mature-mature lacustrine source rock. Main channels for upward escape of deep oil and gas consist of deep faults, unconformity surfaces, main sand bodies or fissures in the study area, in which the deep faults and unconformity surfaces should be the key interest for exploration of sandstone-type uranium deposits in this area. In the process of paleo-channel sandstone-type uranium mineralization in this area, oil and gas play a role in adsorption, reduction and ore-enrichment effect. The mineralization of sandstone-type uranium and oil and gas accumulation evolution are obviously controlled by the inversion developed at the end of Late Cretaceous-Paleocene. |
| ZHAO Xing-qi,QIN Ming-kuan,FAN Hong-hai,LIU Wu-sheng,KANG Shi-hu,ZHANG Zi-long,ZHOU Fei,CAI Ya,SHI Qing-ping.2019.Relationship between Uranium Mineralization and Hydrocarbon Fluids Characteristics in Paleo-channel Uranium Deposits of Central Erlian Basin, Inner Mongolia[J].Acta Geoscientica Sinica,40(3):405-416. |
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