| Yili basin is located in the western part of xinjiang,it has the characteristics of the co-existence of uranium mine and coal mine in shuixigou group in the lower middle Jurassic.Because of its remarkable achievements in prospecting and research,it has received widespread attention from domestic scholars and geologists.Now it has become one of the bases for the exploration of uranium mine in China,and is one of the demonstration bases for the development and utilization of various energy and mineral resources in China.It have been found a total of 160 billion coal mine resources,and have also implemented many large-scale leaching sandstone-type uranium deposits.Because the degree of geological research in Yili basin is not comprehensive,resulting in the lack of understanding of the Yili basin and its metallogenic potential,some prospecting theory is broken,especially coal and uranium coexistence phenomenon and mining sequence problem have plagued geologists.Based on this problem,this paper relies on production and scientific research project "investigation of radioactive geological environment in key coal development area of Yili basin" and attempts to find out the answer based on this question.According to the basic principle of structural geology,sedimentology,sequence stratigraphy and lithofacies palaeogeography,combined with the geological background of Yili basin,this paper mainly takes advangatage of the survey achievemnents of the nuclear industry,coal,mining,petroleum exploration results and other major exploration units over the years have been obtained.Through the analysis of system analysis,comprehensive research,and strive to overall more comprehensively,objectively summarize the history of sedimentary evolution of Yili basin,sedimentary environment and metallogenic regularity,the paper takes the whole basin as the research object,taking Shuixigou Group as the key to various energy resources for the content,studied several kinds of energy mineral enrichment and the geological condition,put forward the timing problems and development of various energy mineral exploration.(1)This paper takes the multi-energy minerals in the whole Yili basin as the research object.It analyzes the tectonic,sedimentary and mineral characteristics of the Yili Basin,and focuses on the sedimentary and sedimentary facies,typical mineralization,metallogenic sequence,metallogenic regularity and metallogenic conditions of the Yili Basin.This paper proposes a survey development and timing scheme.It enriches the ore-forming theory of the Yili Basin and serves geological production.(2)This paper studied the ore-forming sequence and enrichment regularity of various energy mines in Yili Basin.The ore-forming sequence of energy minerals in Yili Basin is: coal mine-uranium mine(strontium mine)-oil and gas.That is,the earliest coal mines,the uranium mines and antimony mines,and the oil and gas are the latest,and the uranium mines and oil and gas have the characteristics of epigenetic enrichment and the coal mines have the characteristics of ore deposits.(3)This paper studies the basic characteristics and metallogenic conditions of typical minerals,analyzes their commonalities and differences,and proposes that uranium is the most important energy mineral in the region,followed by coal mines,tantalum mines,and finally oil and gas minerals.This paper considers that structure,sedimentation and climate are the basic conditions for the formation of multiple energy minerals.(4)In this paper,the structure and distribution of the Shuixigou group are studied from five aspects: sediment thickness and sand-soil ratio.The sedimentary facies belt is re-divided,and the fan-delta phase is considered to be a favorable facies belt for forming a stable mud-sand-mud stratum structure.This stratigraphic structure not only becomes a good uranium deposit space,but also a high-quality oil and gas reservoir,which provides a working idea for further research.(5)In view of the symbiosis of uranium coal in the same layer,breaking industry barriers,promoting resource sharing,supporting national defense and local economic construction,and striving to solve technical problems in production,first proposed the concept of comprehensive exploration and rational development,and attempted to establish coordinated exploration and existence in Yili Basin.(6)The Yili Basin has stable structure and excellent coal-forming conditions.The main coal seams found at the edge of the basin are thick and stable,and have been extending to the center of the basin,and the coal quality and metamorphism are almost the same.It is believed that the main coal seam is continuous throughout the basin and is constructed as the main framework of the coal-bearing strata in the basin,thus expanding the exploration and prospecting targets of the coal mine.(7)The uranium mineralization conditions in the southern margin of the Yili Basin are good.The specific geochemical environment has created a unique uranium metallogenic regularity,indicating that the uranium mineralization or uranium deposits are only distributed near the frontal line of the inter-layer oxidation zone of the basin.No uranium anomalies or uranium mineralization have been found in the basin center,and it is speculated that it is difficult to form uranium deposits in the center of the basin,thereby narrowing the uranium ore prospecting target area. |
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