Changes in Thermal Conductivity of Rocks in the Lithosphere of the West Siberian Basin in the Area of the Tyumen SG-6 Well

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Izvestiya, Physics of the Solid Earth Pub Date : 2023-08-06 DOI:10.1134/S1069351323040067

Yu. I. Galushkin

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Abstract—Numerical reconstructions of the thermal regime of the lithosphere of the West Siberian basin in the Koltogor-Urengoi graben in the vicinity of the Tyumen SG-6 superdeep well are used to analyze the depth distribution of thermal conductivity of basin rocks. Five depth intervals that differ in the pattern of changes in thermal conductivity of rocks are distinguished: permafrost zone, sedimentary section below this zone, zone of anomalous decompaction of rocks, consolidated crust, and mantle. The algorithms for calculating thermal conductivity are considered, and the main factors affecting the depth changes of the latter are determined for each of the five intervals. A sharp decrease in thermal conductivity of rocks at the base of the sedimentary cover and at the basement top in the vicinity of the SG-6 well is associated with rock decompaction due to tectonic fracturing and hydrothermal erosion. The analysis suggests that the stationarity conditions of the process are not observed in optical scanning thermal conductivity measurements and, therefore, this method may overestimate the true thermal conductivity of rocks.

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秋明SG-6井地区西西伯利亚盆地岩石圈岩石热导率变化

摘要对秋明SG-6超深井附近的西西伯利亚盆地koltogore - urengoi地堑岩石圈热状态进行数值重建，分析盆地岩石热导率的深度分布。岩石热导率变化模式有5个不同的深度区间:多年冻土带、多年冻土带下的沉积剖面、岩石异常分解带、固结地壳和地幔。考虑了热导率的计算算法，确定了影响热导率深度变化的主要因素。SG-6井附近沉积盖层底部和基底顶部的岩石热导率急剧下降与构造破裂和热液侵蚀引起的岩石分解有关。分析表明，在光学扫描热导率测量中没有观察到过程的平稳性条件，因此，这种方法可能高估了岩石的真实热导率。

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来源期刊

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.