Gravity inversion of an interface above which the density contrast varies exponentially with depth
Gravity inversion of an interface above which the density contrast varies exponentially with depth
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DOI：
10.1190/1.1442518
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发表时间：
1988-06
期刊：
影响因子：
3.3
通讯作者：
Chai Yufu;W. Hinze
中科院分区：
文献类型：
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作者：
Chai Yufu;W. Hinze
在沉积盆地基底面上，密度对比随深度呈指数变化的界面的映射是很常见的，通过理论上精确的重力方法可以有效地实现，该方法既可以应用于剖面数据，也可以应用于二维数据。界面上方的质量对比由密度对比随深度呈指数变化的垂直矩形棱镜阵列来模拟。在波数域计算由棱镜引起的重力异常，然后将其转换为空间域。在此过程中，数值傅里叶反变换的精度通过基于离散傅里叶偏差方程的移位采样技术显着提高。根据观测到的重力异常数据，通过反复调整棱镜的垂直范围来确定界面深度。用这种方法计算的加利福尼亚洛杉矶盆地的基底表面，与根据…
Mapping of an interface above which the density contrast varies exponentially with depth, as is common at the basement surface of sedimentary basins, is efficiently achieved by a theoretically precise gravity method which can be applied to either profile data or twodimensional data. The contrast in mass above the interface is modeled by an array of vertical rectangular prisms with density contrasts varying exponentially with depth. Gravity anomalies due to the prisms are calculated in the wavenumber domain and then converted to the space domain. The precision of the inverse numerical Fourier transform in this procedure is significantly increased by a shift‐sampling technique based on the discrete Fourier deviation equation. Depth to the interface is determined by iterative adjustment of the vertical extent of the prisms in accordance with observed gravity anomaly data. The basement surface of the Los Angeles basin, California, calculated by this method, closely duplicates the published configuration based...