德国东南部北阿尔卑斯山前陆盆地的岩性约束速度密度关系和垂直应力梯度

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Peter Obermeier, Florian Duschl, Michael C. Drews
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引用次数: 0

摘要

摘要我们系统分析了 41 个井眼的密度和速度数据,建立了德国东南部北阿尔卑斯山前陆盆地主要岩性单元的速度-密度关系。我们将这些关系应用于速度数据,并将所得密度值与实际密度数据和浅层密度模型进行拼接,以检索 55 口深井井筒的完整密度剖面,这些井筒至少穿透了研究区域的新生代剖面。我们将密度剖面与垂直应力相结合,研究了垂直应力梯度的空间分布。因此,我们观察到垂直应力梯度向东减小,这与德国东南部北阿尔卑斯山前陆盆地的地质构造密切相关。因此,在研究区域的西部、中部和东部,垂直应力梯度剖面可作为地面以下真实垂直深度 TVD 的函数,利用幂律关系进行合理估算:西部:21 MPa/km + (TVD/325)1/1.80,R² = 0.98 中部:21 MPa/km + (TVD/410)1/1.93,R² = 0.99 东部:21 MPa/km + (TVD/531)1/1.95,R² = 1.00 此外,我们还研究了上侏罗统碳酸盐岩顶部的垂直应力梯度分布,这是深层地热能源生产的重要含水层。因此,我们的研究为北阿尔卑斯前陆盆地未来的地球物理、地质力学和地质研究提供了宝贵的基础和应用研究资源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lithologically constrained velocity–density relationships and vertical stress gradients in the North Alpine Foreland Basin, SE Germany
Abstract. We systematically analysed density and velocity data from 41 boreholes to establish velocity-density relationships for the main lithological units in the North Alpine Foreland Basin in SE Germany. We applied these relationships to velocity data and spliced the resulting density values with actual density data and a shallow density model to retrieve complete density profiles along 55 deep wellbores, which at least penetrated the Cenozoic section in the study area. We integrated density profiles to vertical stress to investigate the spatial distribution of vertical stress gradients. Thereby, we observed an eastward decrease of vertical stress gradients, which correlates well with the geological configuration of the North Alpine Foreland Basin in SE Germany. Thereby, vertical stress gradient profiles can be reasonably estimated as a function of true vertical depth below ground level TVD in the western, central, and eastern parts of the study area using a power law relationship: West: 21 MPa/km + (TVD/325)1/1.80, R² = 0.98 Central: 21 MPa/km + (TVD/410)1/1.93, R² = 0.99 East: 21 MPa/km + (TVD/531)1/1.95, R² = 1.00 In addition, we also investigated the distribution of vertical stress gradients at the top of Upper Jurassic carbonates, an important aquifer for deep geothermal energy production. Our study, therefore, provides a valuable resource for future geophysical, geomechanical, and geological studies in the North Alpine Foreland Basin, both in a fundamental and applied research context.
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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