乌伦古地区石炭纪火山岩地球化学特征分析  

Analysis of Geochemical Characteristics of Carboniferous Volcanic Rocks in the Wulungu Area

作　　者：倪胜利 王金铎[1] 王千军[1] 白仲才[1] 程世伟[1] 汪佳蓓 NI Sheng-li;WANG Jin-duo;WANG Qian-jun;BAI Zhong-cai;CHENG Shi-wei;WANG Jia-bei(Research Institute of Petroleum Exploration&Development,Shengli Oilfield Company,China Petrochemical Corporation,Dongying 257000,China;Post-doctoral Research Station,Shengli Oilfield Company,China Petrochemical Corporation,Dongying 257000,China;School of Petroleum Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,东营257000 [2]中国石化胜利石油管理局博士后科研工作站,东营257000 [3]重庆科技学院石油与天然气工程学院,重庆401331

出　　处：《科学技术与工程》2020年第9期3576-3584,共9页Science Technology and Engineering

基　　金：中石化胜利油田博士后项目(SOKYZC190085)。

摘　　要：乌伦古地区是准噶尔盆地重要的探区之一,目前已获工业油气流,但仍存在石炭系资源潜力不清、富集规律不明、勘探开发风险大等问题。采用元素地球化学方法,探讨区内火山岩地球化学特征、源区以及构造环境特征。结果表明:姜巴斯套组火山岩具有低TiO2含量,且Nb、Ta等元素负异常的岛弧火山岩特征;而巴山组具有高TiO2含量,轻稀土元素和高场强元素较为富集等特征,为大陆板内裂谷火山岩,但受到火山岛弧的混染;同时揭示上下石炭统火山岩均来自于壳源,在物质来源判别图和构造判别图解中也得到很好的印证。这也表明研究区石炭系经历了从岛弧环境向陆内裂谷环境演变的过程,该研究成果对本区及邻区构造演化及成藏条件研究均具有指导作用。The Wulungu area is one of the important exploration areas in Junggar Basin. At present, industrial oil flow has been obtained. It means that the area has higher exploration potential. But the resource potential and enrichment law are unclear,and the exploitation risk is large. Based on geochemical methods, including main element, trace element, rare-earth element, the geochemical characteristics of volcanic rocks were explored in the region in order to reveal the source areas and tectonic environmental characteristics of Carboniferous. The results show that the lower Carboniferous rock samples all have low content of TiO2,and depleted in Nb、Ta,like the characteristics of volcanic arc;the upper Carboniferous rock samples have high content of TiO2, and the characteristic of LREE and LILE enrichment,what show that the set of basalt formed in an intraplate setting. What is more,these characteristics suggest that these basalts have crust source characteristics. Tectonic discrimination diagrams and source discrimination charts have also show that. It also means that the Wulungu area underwent a process from volcanic arc to intraplate setting. The results of this study are instructive to the study of tectonic evolution and reservoir formation conditions in this area and adjacent areas.

关 键 词：火山岩 姜巴斯套组 巴山组 石炭系 乌伦古地区 

分 类 号：TE122.113[石油与天然气工程—油气勘探]