• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Gravity Inversion of Blocky Basement Relief Using L-0 Norm Constraint with Exponential Density Contrast Variation
【24h】

Gravity Inversion of Blocky Basement Relief Using L-0 Norm Constraint with Exponential Density Contrast Variation

机译：具有指数密度对比变化的L-0规范约束的L-0规范约束的块状地下室浮雕的重力反演

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Depicting the basement relief of a sedimentary basin with gravity data is vital to predicting the hydrocarbon potential of a sedimentary basin and guiding exploration work. We have developed a gravity inversion method to estimate the depth to a blocky basement of a sedimentary basin. The basement rocks are assumed to be homogeneous and have uniform density, while the density of the sediment over the basement increases exponentially with depth. The density contrast between the sediment and the basement at the surface varies horizontally. The decay factor of density contrast is also nonuniform. The sediment above the basement is divided into vertically juxtaposed prisms, and the depth of the bottom of each prism represents the depth to the basement and is the parameter to be estimated. The L-0 norm is introduced to limit the gradient of the parameter vector to obtain the model constraint function. We then establish the objective function for inversion by combining the gravity data misfit function, the known depth constraint function, and the model constraint function. The inversion is performed by minimizing the objective function using the nonlinear conjugate gradient algorithm. The inversion method is evaluated using a 2D and a 3D sedimentary basin model. The results show that our proposed method is capable of delineating the blocky basement relief of a sedimentary basin, and the result is sharper than that obtained using the L-1 norm constraint. The method is applied to real data from the western part of the Zhu 1 depression in the Pearl River Mouth Basin, northern South China Sea. The solution reveals a strongly faulted basement, which is in accordance with the known tectonic information indicating the basin is a fully developed graben.
机译：描绘了具有重力数据的沉积盆地的地下室浮雕对于预测沉积盆地的烃潜力和指导勘探工作至关重要。我们开发了一种重力反演方法，以估算沉积盆地的块状地下室的深度。假设地下室岩石是均匀的并且具有均匀的密度，而基底上的沉积物的密度随深度呈指数增加。沉积物之间的密度对比度和表面的基底之间水平变化。密度对比度的衰减因子也是不均匀的。地下室上方的沉积物被分成垂直并置的棱镜，并且每个棱镜的底部的深度代表地下室的深度，并且是待估计的参数。引入L-0规范以限制参数向量的梯度以获得模型约束函数。然后，我们通过组合重力数据错入功能，已知深度约束函数和模型约束函数来建立反转的目标函数。通过使用非线性共轭梯度算法最小化目标函数来执行反演。使用2D和3D沉积盆模型评估反转方法。结果表明，我们所提出的方法能够描绘沉积盆地的块状地下室浮雕，结果比使用L-1规范约束获得的结果锐利。该方法应用于南海北部珠江口盆地朱1坳陷西部的真实数据。该解决方案揭示了强烈断层的地下室，这与指示盆地的已知构造信息是完全发育的Graben。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号