Collaborative Research: Testing Models of Calcite Microcrystal Diagenesis Through Experiments, Geochemistry, and Advanced Imaging

合作研究：通过实验、地球化学和高级成像测试方解石微晶成岩作用模型

基本信息

批准号：
1828880
负责人：
Stephen Kaczmarek
金额：
$ 15.57万
依托单位：
Western Michigan University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2021-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1828880&HistoricalAwards=false
关键词：
Collaborative Research Testing Models Calcite

项目摘要

The resources contained in underground geologic reservoirs are key to the economic activity and vitality of communities, companies, and countries. To develop these resources in a cost-effective manner, it is vital to understand the plumbing of these reservoirs-specifically how big the pores (open spaces) are in the rocks, how well they are connected, and what kind of fluids they hold. This study focuses on small pores, called micropores, to understand how they form, and how they change as they are buried in the Earth. This knowledge will allow people such as farmers, water plant managers, and the oil and gas industry to drill fewer wells, increasing their economic competitiveness and decreasing disturbances to the environment and people. Micropores are also responsible for premature deterioration of roads constructed with crushed limestone. Therefore, the results from this work could lead to more robust highways, reducing construction and maintenance costs, while providing a safer and smoother ride for drivers. Previous work shows that most micropores are hosted in a framework of calcite microcrystals. The current research aims to understand the fundamental controls on the textures of these microcrystals in limestones. Numerous generalized pathways for calcite microcrystal formation and evolution have been proposed. None, however, has tied microcrystal texture to diagenetic process in a robust manner. Our aim is to integrate laboratory experiments, advanced imaging, and high-resolution geochemical techniques to better understand the diagenesis of calcite microcrystals and thus the micropores between them. Specifically, we propose to use experiments and a wide variety of natural samples to assess the geochemical heterogeneity and genetic evolution of the various calcite microcrystal textures. We hypothesize that spatial variations in microcrystal chemistry will reveal that the different microcrystal textures correlate to positions along a diagenetic trajectory of increasing cementation (i.e., microcrystal textures become more fitted with progressive burial and cementation).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

地下地质水库中包含的资源是社区，公司和国家的经济活动和活力的关键。要以具有成本效益的方式开发这些资源，至关重要的是要了解这些水库的管道特定于孔中的大小（开放空间）在岩石中有多大，它们的连接状况如何，以及它们所拥有的液体。这项研究的重点是称为Micropores的小毛孔，以了解它们的形成方式以及它们在地球上埋葬时的变化。这些知识将使农民，水厂管理者和石油和天然气行业等人更少地钻井，从而增加其经济竞争力并减少对环境和人民的干扰。微孔还负责用压碎的石灰石建造的道路过早恶化。因此，这项工作的结果可能会导致更强大的高速公路，降低建筑和维护成本，同时为驾驶员提供更安全，更光滑的骑行。先前的工作表明，大多数微孔托管在方解石微晶的框架中。当前的研究旨在了解这些微晶在石灰石中的纹理的基本控制。已经提出了许多有方解石微晶形成和进化的通用途径。但是，没有一个将微晶体纹理与成岩晶体相结合到成岩过程。我们的目的是整合实验室实验，高级成像和高分辨率地球化学技术，以更好地了解方解石微晶的成岩作用，从而更好地了解它们之间的微孔。具体而言，我们建议使用实验和多种天然样品来评估各种方解石微晶纹理的地球化学异质性和遗传进化。我们假设微晶化学的空间变化将表明，不同的微晶纹理与沿着胶结度增加的成岩成分轨迹相关（即，微晶质地更适合进行渐进的埋葬和固定性）。该奖项反映了NSF的构建范围，并具有智力的构建范围。审查标准。