Development of new quantitative interpretation techniques for applied geophysics.

开发新的应用地球物理学定量解释技术。

• 批准号: 326988-2013
• 负责人: Farquharson, Colin
• 金额: $ 2.4万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=548949
• 关键词: Development; new; quantitative; interpretation; techniques

The goal of geophysics is to understand, and perhaps predict, the dynamic processes that move and shape the Earth beneath our feet, and to "look" into the Earth to see these processes in action, or their consequences. The process of "looking" generally involves the construction of a model that resembles, to the best of our knowledge and abilities, the true subsurface of the Earth. The model construction procedure involves updating automatically the parameters of a prospective model such that synthetic geophysical survey data computed for the model match the data that were actually acquired in geophysical surveys. This procedure is referred to as inversion. Inversion routines comprise two main components: a computational procedure for calculating synthetic data for a given Earth model, and an algorithm for successively updating the parameters of the model. The proposed research determines to (i) improve the mathematics used by computer programs to synthesize geophysical survey data for realistically complex Earth models, and (ii) improve the algorithms used to invert geophysical data. Recent advances have produced what is effectively the first generation of these programs for fully three-dimensional models of the Earth. However, the mathematical representations these programs use for the arrangements of rock types in the subsurface are basic, being neither flexible enough to cope with the complicated structures that occur in nature, nor precise enough to handle the dramatic changes between adjacent rock types that can exist for certain important features such as ore deposits. This research programme will investigate the use of more sophisticated and refined representations of the subsurface to overcome these problems. The result will be computer programs that can provide more detailed and more reliable models, or "images", of the subsurface. The advancements that will be made will be applicable to most areas of geophysics. However, the main context considered for the proposed research will be mineral exploration.

地球物理学的目标是理解，也许是预测，移动和塑造我们脚下的地球的动态过程，并“看”到地球看到这些过程的行动，或其后果。“看”的过程通常涉及到构建一个模型，尽我们的知识和能力，模拟地球真正的地下。模型构造过程涉及自动更新远景模型的参数，使得为模型计算的合成地球物理勘测数据与在地球物理勘测中实际采集的数据相匹配。这个过程被称为倒置。反演程序包括两个主要组成部分：一个计算程序，用于计算给定地球模型的合成数据，以及一个算法，用于连续更新模型的参数。所提出的研究确定（i）改进计算机程序所使用的数学，以合成现实复杂地球模型的地球物理勘测数据，以及（ii）改进用于反演地球物理数据的算法。最近的进展已经产生了什么是有效的第一代这些程序的全三维模型的地球。然而，这些程序用于地下岩石类型排列的数学表示是基本的，既不足够灵活以科普自然界中发生的复杂结构，也不足够精确以处理相邻岩石类型之间的剧烈变化，这些岩石类型可能存在某些重要特征，如矿床。这项研究计划将调查使用更复杂和更精细的地下表示来克服这些问题。其结果将是计算机程序，可以提供更详细和更可靠的模型，或“图像”，地下。所取得的进展将适用于地球物理学的大多数领域。然而，拟议研究考虑的主要背景将是矿产勘探。