Present-day stress stratification in the lower Palaeozoic shale sequence of the Baltic Basin, northern Poland, inferred from borehole data

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Marek Jarosiński , Kinga Bobek , Michał Wojtowicz , Radomir Pachytel , Maciej Trzeciak , Alicja Piłacik
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引用次数: 0

Abstract

We performed an analysis of present-day stress profiles for four wells penetrating the Lower Palaeozoic shale sequence of the Baltic Basin (northern Poland). Breakouts, hydraulic fracturing and leak-off tests were used to calibrate stress models based on anisotropic elastic shale properties. Initial stress models, balancing the lengths of the modelled and observed breakouts, indicated a degradation of the mechanical properties reconstructed from the density and dipole acoustic tool logs. Taking this adverse effect into account, final stress models were calculated which showed a stratification of the stress regime consistent with the lithostratigraphic shale units. A clear dominance of the horizontal stress-generating gravity factor over the horizontal tectonic strain was demonstrated. The obtained values of tectonic strain in the shale sequence compared to the previously determined strain in the crystalline basement of the same study area suggest a significant role of viscoelastic relaxation of the shale sequence.

根据钻孔数据推断波兰北部波罗的海盆地下古生代页岩序列的现今应力分层情况
我们对穿透波罗的海盆地(波兰北部)下古生界页岩序列的四口油井的现今应力剖面进行了分析。根据各向异性的弹性页岩特性,我们利用破裂、水力压裂和渗漏测试来校准应力模型。初始应力模型平衡了模拟和观测到的破裂长度,表明从密度和偶极声学工具测井中重建的力学性能有所下降。考虑到这一不利影响,计算出的最终应力模型显示,应力体系的分层与岩层页岩单位一致。结果表明,产生水平应力的重力因子明显高于水平构造应变。页岩层的构造应变值与之前在同一研究区域的结晶基底中测定的应变值相比,表明页岩层的粘弹性松弛起了重要作用。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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