Gravity modelling by using vertical prismatic polyhedra and application to a sedimentary basin in Eastern Anatolia

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Near Surface Geophysics Pub Date : 2024-03-28 DOI:10.1002/nsg.12297
Nedim Gökhan Aydın, Turgay İşseven
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Abstract

There are various methods suggested for modelling the geometry of sedimentary basins by using gravity anomalies in the literature. When dealing with datasets that are non-uniformly distributed across a study area, the choice of modelling method can significantly impact data reliability and computational resource usage. In this study, we present a gravity modelling approach utilizing prismatic vertical polyhedra. First, we summarize the requirement of such a method by highlighting limitations associated with a commonly employed modelling method that uses rectangular grid-following vertical prisms for modelling. By contrast, we propose a method that adapts a polygonal mesh to the distribution of input gravity data points, each polygonal mesh cell containing one data point and using polygonal grid-following vertical prisms for gravity modelling. To validate our method, we conduct tests using two synthetically constructed subsurface models – one featuring a normal fault and the other a deep basin. These are used to generate synthetic gravity observation data at irregularly spaced points that broadly follow the geology. The data are then inverted for obtaining subsurface structures by modelling with (a) rectangular prisms on a regular grid and (b) with our polygonal prisms on the tessellated grid. The inversion process involves calculating the heights of the prisms in both approaches, assuming a constant density contrast. The comparative analysis demonstrates the superior effectiveness of our approach (b). Finally, we apply our newly developed method to real gravity data recently collected from Gezin province, situated in the north-eastern region of the Lake Hazar pull-apart basin in Eastern Turkey. Our modelling results reveal previously underestimated basin geometry, suggesting the presence of an additional, previously unidentified fault to the east of Gezin, which forms the southern boundary of the basin.
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利用垂直棱柱多面体建立重力模型并将其应用于安纳托利亚东部的一个沉积盆地
文献中提出了多种利用重力异常模拟沉积盆地几何形状的方法。在处理整个研究区域非均匀分布的数据集时,建模方法的选择会对数据的可靠性和计算资源的使用产生重大影响。在本研究中,我们提出了一种利用棱柱垂直多面体的重力建模方法。首先,我们总结了对这种方法的要求,强调了常用建模方法的局限性,即使用矩形网格垂直多面体建模。相比之下,我们提出了一种根据输入重力数据点的分布调整多边形网格的方法,每个多边形网格单元包含一个数据点,并使用多边形网格追随垂直棱镜进行重力建模。为了验证我们的方法,我们使用两个合成的地下模型进行了测试--一个是正断层,另一个是深盆地。这些模型用于在不规则间隔的点上生成合成重力观测数据,这些点大体上与地质情况一致。然后对数据进行反演,通过(a)在规则网格上用矩形棱镜建模和(b)在细分网格上用多边形棱镜建模来获得地下结构。反演过程包括计算两种方法中棱柱的高度,并假设密度对比不变。对比分析表明,我们的方法(b)更加有效。最后,我们将新开发的方法应用于最近从 Gezin 省收集到的实际重力数据,该省位于土耳其东部哈扎尔湖拉开盆地的东北部地区。我们的建模结果揭示了之前被低估的盆地几何形状,表明在 Gezin 东部还存在一个之前未被发现的断层,它构成了盆地的南部边界。
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来源期刊
Near Surface Geophysics
Near Surface Geophysics 地学-地球化学与地球物理
CiteScore
3.60
自引率
12.50%
发文量
42
审稿时长
6-12 weeks
期刊介绍: Near Surface Geophysics is an international journal for the publication of research and development in geophysics applied to near surface. It places emphasis on geological, hydrogeological, geotechnical, environmental, engineering, mining, archaeological, agricultural and other applications of geophysics as well as physical soil and rock properties. Geophysical and geoscientific case histories with innovative use of geophysical techniques are welcome, which may include improvements on instrumentation, measurements, data acquisition and processing, modelling, inversion, interpretation, project management and multidisciplinary use. The papers should also be understandable to those who use geophysical data but are not necessarily geophysicists.
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