柴达木盆地英东地区大地热流及影响因素
邹开真 , 庞玉茂 , 陈琰 , 赵健 , 周飞 , 朱军 , 郭兴伟 , 段立锋 , 韩昕泽
地球科学 ›› 2023, Vol. 48 ›› Issue (03) : 1002 -1013.
柴达木盆地英东地区大地热流及影响因素
Heat Flow of the Yingdong Area in Qaidam Basin and Its Influencing Factors
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英雄岭构造带是柴达木盆地油气最为富集的地区之一,地温场对油气成藏过程有重要影响,也是油田开发工程实施的重要参考.利用试油静温数据,结合激光扫描法开展岩心热导率及放射性生热测试,对研究区地温场进行了研究.英东地区地温梯度为31.8~35.3 ℃/km,平均为33.6 ℃/km,新近系热导率为1.8~2.4 W/m/K,平均为2.07 W/m/K,大地热流值为65~74 mW/m2,平均为69 mW/m2.热流呈“西高东低”特征,昆北、南翼山及一里坪等地热流值超过65 mW/m2,而阿尔金山前、冷湖构造带及涩北等地较低,咸水泉和冷湖等地普遍低于50 mW/m2.新近系实测平均生热率为2.84 μW/m3,对热流的贡献约20%.研究区具有“热壳温幔”特征,其影响因素包括地壳放射性生热、蚀源区高U中酸性侵入岩、印度板块汇聚引起的构造热及热岩石圈厚度较薄等.
柴达木盆地 / 英东地区 / 地温梯度 / 热导率 / 放射性生热 / 大地热流 / 石油地质
Qaidam basin / Yingdong area / geothermal gradient / thermal conductivity / radiogenic heat production / heat flow / petroleum geology
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国家自然科学基金项目(41806057)
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