银额盆地石炭系—二叠系阿木山组碳酸盐岩地球化学特征及古海洋环境:以乌力吉陶来剖面为例  

Geochemical Characteristics and Paleo-Oceanic Environment of Carbonate Rocks of Carboniferous-Permian Amushan Formation in Yin’e Basin:Example from Wuliji Taolai Section

作　　者：史冀忠[1,2] 魏建设[1,2] 姜亭 宋博[1,2] 卜建军 许伟[1,2] 王博[4] SHI Jizhong;WEI Jianshe;JIANG Ting;SONG Bo;BU Jianjun;XU Wei;WANG Bo(Xi’an Center of China Geological Survey,Xi’an 710119,Shaanxi,China;Key Laboratory of Paleozoic Oil and Gas Geology in North China,China Geological Survey,Xi'an 710119,Shaanxi,China;Wuhan Center of China Geological Survey,Wuhan 430205,Hubei,China;Exploration and Development Research Institute of Petro China Changqing Oilfield Company,Xi'an 710018,Shaanxi,China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710119 [2]中国地质调查局北方古生界油气地质重点实验室,陕西西安710119 [3]中国地质调查局武汉地质调查中心,湖北武汉430205 [4]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《西北地质》2024年第6期113-126,共14页Northwestern Geology

基　　金：中国地质调查局项目“河西走廊盆地群油气调查评价”(DD20230261);“西北含油气盆地油气战略性矿产调查评价”(DD20230314);“银额盆地西部–北山盆地群油气地质调查”(DD20190092)联合资助。

摘　　要：为厘定银额盆地石炭系—二叠系阿木山组碳酸盐岩沉积时的古海洋环境,为油气勘探提供理论依据。笔者以乌力吉陶来剖面为例,通过剖面实测及系统采样,采用岩石学与地球化学相结合的方法,探讨阿木山组碳酸盐岩形成时的古海洋环境及油气勘探前景。地球化学特征表明:阿木山组碳酸盐岩陆源元素质量分数均较低,稀土元素特征值、碳氧同位素之间未见明显相关性,受陆源物质、成岩作用及热液作用的影响较弱,所测地球化学数据能有效反映碳酸盐岩形成时的古海洋环境。阿木山组碳酸盐岩沉积于正常海相环境,属温暖或炎热的亚热带气候,古氧相为弱氧化–弱还原环境,古海水温度为13.22~34.60℃,平均值为21.35℃,总体经历了1个大的海侵海退旋回。根据碳酸盐岩的分布及生烃条件,预示阿木山组有较好的油气勘探前景。In order to analyze the paleo-oceanic environment of carbonate rocks of Carboniferous-Permian Amushan Formation in Yin’e basin,and provide theoretical basis for oil and gas exploration.Taking the Wuliji Taolai section as an example,this paper discusses the paleo-ocean environment and oil and gas exploration prospect of carbonate rocks of the Amushan Formation based on petrologic and geochemical data.The geochemical characteristics show that the terrigenous elements of carbonate rocks of the Amushan Formation are relatively low.There is no obvious correlation between characteristic values of rare earth elements,carbon and oxygen isotopes.The influence of terrigenous materials,diagenesis,and hydrothermal is weak.The geochemical data can reasonably indicate the paleo-oceanic environment of the carbonate rocks.The carbonate rocks of the Amushan Formation were deposited in normal marine environments with warm or hot subtropical climate.The paleo-oxygen facies were in a weak oxidation-weak reduction environment.The paleo-sea temperature ranged from 13.22 to 34.60℃,with an average of 21.35℃.The distribution of carbonate rocks and hydrocarbon generation conditions indicate that Amushan Formation has good oil and gas exploration prospects.

关 键 词：石炭系—二叠系 阿木山组 碳酸盐岩 地球化学 古海洋环境 

分 类 号：P618.13[天文地球—矿床学]