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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
PDF(3679 KB)
PDF(3679 KB)
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.
The Yingxiongling structural belt is one of the most important petroliferous areas in the Qaidam Basin. The geothermal field not only has an important influence on the oil and gas accumulation process, but also is an important reference for the implementation of oilfield development and other projects. Based on the temperature data by well oil-test and the measured thermal conductivity data, the present-day heat flow characteristics in the study area are studied. The geothermal gradient in the Yingdong area ranges from 31.8 to 35.3 °C/km, with an average of 33.6 °C/km. The thermal conductivity of Neogene rocks ranges from 1.8 to 2.4 W/m/K, with an average of 2.07 W/m/K. The calculated heat flow value is 65-74 mW/m2, and the average value is 69 mW/m2. The heat flow in the central and western parts of the Qaidam Basin is mainly characterized by “high in the west and low in the east” pattern. The heat flow in Kunbei, Nanyishan and Yiliping is generally greater than 65 mW/m2, while the heat flow in the front of the Altun Mountains, the Lenghu structural belt and the Sebei is relatively low. The heat flow is generally lower than 50 mW/m2 in Xianshuiquan and Lenghu. The measured average heat production rate is ca. 2.84 μW/m3, and the contribution rate to heat flow is about 20%. The study area has a relative thermal crust and warm mantle, and the heat flow is influenced by the large contribution of crustal radioactive heat production, the high U intrusive rocks of the sedimentary source area, the tectonic heat caused by the convergence of the Indian plate, and the thermal lithosphere thickness, etc..
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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