An updated terrestrial heat flow dataset for the Junggar basin, northwest China: implications for geothermal resources

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Chao Zhang, Fei Wang, Yidan Zhang, Hui Lu, Haozhu Zhang, Ronghua Huang, Zepeng Liu, Junji Chen
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Abstract

Summary Terrestrial heat flow plays a vital role in determining the present thermal regimes of sedimentary basins, offering a robust foundation for understanding hydrocarbon maturation processes and the geothermal resource potential. The Junggar basin is one of the largest and most petroliferous superimposed petroleum basins in China. However, research on heat flow is scarce. In this study, 94 new high-quality heat flow values are derived from through borehole temperature analysis and thermal conductivity measurements of rocks. The results indicate that (1) the geothermal gradient in the basin varies from 11.4 to 28.3° C/km, with a mean value of 20.9 ± 3.4° C/km, and the heat flow varies from 23.4 to 64.5 mW/m2, with a mean value of 45.1 ± 8.4 mW/m2. The overall low geothermal gradient and heat flow are attributed to the continuous cooling during the Meso-Cenozoic. (2) At basin scale, the high heat flow values are primarily concentrated in areas characterized by basement uplift, whereas the low heat flow values are mainly located in the depressions. This suggests that thermal refraction is the primary factor influencing the heat flow variations. (3) Although large-scale development and utilization of geothermal resources face challenges, certain local areas in the basin show promise for geothermal resource utilization.
中国西北准噶尔盆地最新陆地热流数据集:对地热资源的影响
摘要 陆地热流在决定沉积盆地目前的热机制方面起着至关重要的作用,为了解油气成熟过程和地热资源潜力提供了坚实的基础。准噶尔盆地是中国最大、含油量最高的叠加石油盆地之一。然而,有关热流的研究却很少。本研究通过钻孔温度分析和岩石热导率测量,得出了 94 个新的高质量热流值。结果表明:(1) 盆地地热梯度在 11.4 至 28.3°C/km 之间,平均值为 20.9 ± 3.4°C/km;热流量在 23.4 至 64.5 mW/m2 之间,平均值为 45.1 ± 8.4 mW/m2。地热梯度和热流量总体较低的原因是中新生代的持续冷却。(2) 在盆地尺度上,高热流值主要集中在基底隆起的区域,而低热流值主要位于洼地。这表明热折射是影响热流变化的主要因素。(3) 虽然地热资源的大规模开发利用面临挑战,但盆地中的某些局部地区显示出地热资源利用的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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