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首页> 外文会议>28th annual Offshore Technology Conference >A Method to Constrain the Configuration of the Subsurface Structure in 3-D Gravity Inversion
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A Method to Constrain the Configuration of the Subsurface Structure in 3-D Gravity Inversion

机译：一种限制3D重力反演中地下结构形态的方法

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摘要

A three-dimensional inversion technique is developed to investigate the structure of the oceanic crust, using high quality offshore bathymetry, gravity and seismic data. The gravity signatures associated with variations in the thickness of the oceanic crust are isolated from the observed free-air anomaly by subtracting the gravitational effects of seafloor topography and the upper mantle thermal structure, downward continued to the mean depth of the crust/mantle interface and converted onto the relief on that surface. The thickness of the oceanic crust is then calculated by subtracting sea water depth from the depth of the gravity-inferred crust/mantle interface. Seismic refraction data was introduced directly as a constraint in the construction of the initial model for the configuration of the crust/mantle interface and the iterative process of the 3-D joint inversion to reduce the ambiguity in gravity interpretation. This technique can be easily applied to the off-shore areas to interpret bathymetry, gravity and seismic data that have been routinely collected for the purpose of geophysical exploration. Compared to the unconstrained gravity inversion, this technique can predict a 3-D crustal model that fits better both gravity and seismic observation data of the study area.
机译：利用高质量的海上测深，重力和地震数据，开发了一种三维反演技术来研究洋壳的结构。通过减去海底地形和上地幔热结构的引力效应，将与海洋地壳厚度变化相关的重力特征与观测到的自由空气异常隔离开，向下持续到地壳/地幔界面的平均深度，并转换为该表面上的浮雕。然后，通过从重力推断的地壳/地幔界面的深度中减去海水深度来计算大洋地壳的厚度。在构造地壳/地幔界面的初始模型和3-D联合反演的迭代过程以减少重力解释的歧义的初始模型的构建中，直接引入了地震折射数据。这项技术可以轻松地应用于近海地区，以解释为地球物理勘探目的而常规收集的测深，重力和地震数据。与无约束重力反演相比，该技术可以预测一个更适合研究区域重力和地震观测数据的3-D地壳模型。

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