Heat production of sedimentary rocks in Chengdao-Kendong area, Bohai Bay basin

IF 4.6

Unconventional Resources Pub Date : 2025-06-26 DOI:10.1016/j.uncres.2025.100207

Xiaolin Liu , Anyu Jing , Yuanjin Sun , Chao Sun , Ruibo Jiang , Xing Mu , Xiaoxue Jiang , Fang Xie , Yaodong Xu , Chuanqing Zhu

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Abstract

Sedimentary heat flow, as part of terrestrial heat flow, plays a key role in hydrocarbon generation by affecting the temperature of source rocks, thus influencing the thermal evolution and maturity of organic matter. The radioactive heat production rate of rocks is essential for studying sedimentary heat flow. Based on empirical formulas proposed by previous researchers that relate natural gamma log to heat production rates, this study calculated 26,707 rock heat production rate data points from 60 wells in the Chengdao-Kendong area. Results show that the average heat production rate of the sedimentary layers is 1.06 ± 0.34 μW/m³,and the different lithologies are as follows: mudstone 1.28 μW/m³, sandstone 1.05 μW/m³, conglomerate 1.01 μW/m³, glutenite 0.93 μW/m³, limestone 0.44 μW/m³, dolomite 0.45 μW/m³.The radioactive heat production ranges from 3.0 to 6.8 mW/m². In the Changdi and Gudong areas, sedimentary layers contribute 6.3–10 % of the terrestrial heat flow, while the Kendong area's contribution is around 4.3 %. Moreover, the distribution of terrestrial heat flow is closely related to variations in basement depth, mainly influenced by mantle heat flow in the Chengdao-Kendong area.

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渤海湾盆地埕岛—垦东地区沉积岩产热作用

沉积热流作为陆相热流的一部分，通过影响烃源岩的温度，从而影响有机质的热演化和成熟度，在生烃过程中起着关键作用。岩石的放射性产热率是研究沉积热流的必要条件。根据前人提出的自然伽马测井与产热率关联的经验公式，计算了埕岛—垦东地区60口井的26707个岩石产热率数据点。结果表明：沉积层平均产热速率为1.06±0.34 μW/m3，不同岩性分别为泥岩1.28 μW/m3、砂岩1.05 μW/m3、砾岩1.01 μW/m3、砂砾岩0.93 μW/m3、灰岩0.44 μW/m3、白云岩0.45 μW/m3。放射性产热范围为3.0 ~ 6.8 mW/m2。在昌地和鼓洞地区，沉积层对大地热流的贡献率为6.3 ~ 10%，而在肯东地区，沉积层对大地热流的贡献率约为4.3%。此外，大地热流分布与基底深度变化密切相关，主要受埕岛—肯东地区地幔热流的影响。

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来源期刊

Unconventional Resources

CiteScore

4.10

自引率

0.00%

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