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首页> 外文期刊>Pure and Applied Geophysics >Inversion of Gravity Data for Imaging of a Sediment-basement Interface: A Case Study in the Northwestern Part of Bangladesh
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Inversion of Gravity Data for Imaging of a Sediment-basement Interface: A Case Study in the Northwestern Part of Bangladesh

机译：利用重力数据反演沉积物-基底界面的图像：孟加拉国西北部的案例研究

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摘要

Gravity data collected by the Geological Survey of Bangladesh are processed and interpreted for imaging of a sediment-basement interface over the northwestern part of Bangladesh. The observed gravity data are processed for discriminating gravitational fields contributed subtly from the shallow basement topographic feature with the twelve nodal piecewise cubic polynomial-based finite-element approach. In spectral analysis, the presence of a widely spread shallow basement feature has been detected and interpretation of gravity data using a two-dimensional gravity inversion technique indicates that its depth ranges from 0.041 km to 0.570 km relative to ground surface. In the northern part of the study area, the inferred basement configuration shows a general depression of the basement in the Takurgaon-Panchagar and Lalmonirhat districts and reaches a maximum depth of about 0.570 km. In the Nilphamari district and its southwestern part, the basement occurs at the most shallow depth due to its upliftment. However, the estimated sediment-basement interface depths are compared with the borehole and other geophysical interpretative information and are found to be consistent.
机译：处理并解释了孟加拉国地质调查局收集的重力数据，以成像孟加拉国西北部沉积物-基底界面。使用基于十二个节点的分段三次多项式的有限元方法，对观测到的重力数据进行处理，以区分由浅地下室地形特征贡献的重力场。在频谱分析中，已经检测到广泛分布的浅层地下特征的存在，并且使用二维重力反演技术对重力数据的解释表明，其相对于地面的深度范围为0.041 km至0.570 km。在研究区域的北部，推断出的地下室构造显示了塔库尔冈-庞恰加尔和拉莫尼哈特地区地下室的整体凹陷，最大深度约为0.570公里。在Nilphamari区及其西南部，由于隆起，基底出现在最浅的深度。但是，将估计的沉积物-基底界面深度与钻孔和其他地球物理解释信息进行了比较，发现是一致的。

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