Geothermal evolution of the Astrakhan Arch region of the Pricaspian basin
Geothermal evolution of the Astrakhan Arch region of the Pricaspian basin
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DOI：
10.1007/s00531-007-0258-z
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发表时间：
2008-09
影响因子：
2.3
通讯作者：
A. Ismail-Zadeh;H. Wilhelm;Y. Volozh
中科院分区：
文献类型：
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作者：
A. Ismail-Zadeh;H. Wilhelm;Y. Volozh
阿斯特拉罕拱门地区包含普里帕斯盆地最大的盐下构造之一，泥盆纪至石炭纪沉积物中油气生成和聚集的前景被认为很高。本文讨论了盐运动变形区的构造和地热演化问题。最初，我们开发了一个区域构造演化模型沿着地质剖面使用体积平衡和回剥方法和地质约束的沉积，侵蚀，和古水深。然后，我们开发了地热模式（沿着研究剖面）与区域构造演化。模型受到沿剖面沿着四个深钻孔中测得的温度的约束。我们表明，目前的温度和热通量的影响，盐底辟的存在。从早石炭世到中二叠世，由于区域海侵和海水的存在，模型预测的温度变化很大。泥盆纪-石炭纪碳酸盐岩的温度自晚二叠世（盐后沉积时间）以来不断升高，并在剖面的SW部分达到最大值。如果关于恒定的垂直和零横向热通量的模型假设是有效的，我们可以得出结论，碳氢化合物是最有可能产生在SW的一部分，该地区的后早二叠世的时间。
The Astrakhan Arch region contains one of the largest sub-salt structures of the Pricaspian basin, where perspectives for hydrocarbon generation and accumulation in the Devonian to Carboniferous deposits are considered to be high. The paper addresses the problem of structural and geothermal evolution of the region deformed by salt movements. Initially, we developed a model of the regional structural evolution along a geological profile using the volume-balancing and back-stripping methods and geological constraints on the sedimentation, erosion, and paleo-water depths. Then we developed geothermal models (along the study profile) associated with the regional structural evolution. The models were constrained by the temperatures measured in four deep boreholes along the profile. We show that the present temperatures and heat flux are influenced by the presence of salt diapirs. Since the Early Carboniferous and till Middle Permian times, the temperatures predicted by the models vary significantly due to the regional transgression and the presence of seawater. The temperature of Devonian–Carboniferous carbonates increases since the Late Permian (time of post-salt deposition) and attains its maximum values in the SW-part of the profile. If the model assumptions concerning the constant vertical and zero lateral heat fluxes are valid, we can conclude that hydrocarbons are most likely to be generated in the SW-part of the region for the post-Early Permian time.