Silica Diagenesis: Deeply Buried Sandstones

二氧化硅成岩作用：深埋砂岩

• 批准号: 9017748
• 负责人: Raymond Siever
• 金额: $ 12.95万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-01 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017748&HistoricalAwards=false
• 关键词: Silica; Diagenesis; Deeply; Buried; Sandstones

The diagenesis of deeply buried quartz arenite sandstones is important in the evolution of sedimentary basins, including paleohydrology and thermal history and the transition from high grade diagenesis to low grade matamorphism. The primary aim of petrographic study will be to measure quantitatively cementation by quartz and carbonate, pressure solution (geometry of grain contacts, timing and extent of chemical compaction), and porosity loss as a function of pressure, temperature and integrated time- temperature history. Samples will be examined by petrographic microscopy, cathodo-luminescence and SEM, as well as by some chemical and istotopic analyses. The diagenetic history will be reconstructed and set in the context of burial and thermal history. Pressure solution will be one of the main focuses, especially as it pertains to the transition between the high grade diagenesis of deep burial and the low grade metamorphism of parts of deformed mountain belts. Sandstones to be sampled include the Pennsylvanian of the Green River basin, Pennsylvanian and Ordovician of the Anadarko basin, and Cambrian of the Michigan and Illinois basins. Now uplifted undeformed and deformed sections of the Pennsylvanian of Pennsylvania will be compared with the Rhode Island Pennsylvanian and the Silurian Clough quartzite of New Hampshire. The oldest sandstones will be of Proterozoic quartz arenites from a well-studied section of Spitsbergen. This study has practical significance in the loss of porosity of quartz arenites at great depths (4-9km), which influences the mass transfer of fluids and thus production of oil and, especially, gas.

深埋石英砂岩的成岩作用 在沉积盆地的演化中起重要作用，包括 古水文和热历史以及从高 低级变质作用。 的主要目的 岩相学研究将定量测量胶结作用 石英和碳酸盐，压力溶液（颗粒的几何形状 化学压实的接触、时间和程度）和孔隙度 作为压力、温度和综合时间的函数的损失- 温度历史 样品将通过岩相分析进行检查。 显微镜，阴极发光和SEM，以及一些 化学和同位素分析。 成岩历史将是 重建并设置在埋葬和热的背景下 历史 压力解决方案将是主要焦点之一， 特别是当它涉及到高之间的过渡 深埋藏的分级成岩作用和深埋藏的低级变质作用 部分变形的山地带。 待取样砂岩 包括绿色河流域的宾夕法尼亚阶， 阿纳达科盆地的奥陶纪， 密歇根州和伊利诺伊州盆地。 现在被举起，没有变形， 宾夕法尼亚州的彭萨科拉阶的变形部分 与罗得岛宾夕法尼亚纪和志留纪相比 新罕布什尔州的克拉夫石英岩。 最古老的砂岩 元古代石英砂质岩， 斯匹次卑尔根群岛 本文的研究对我国的经济损失具有现实意义 石英砂岩的孔隙度在很大的深度（4- 9 km）， 影响流体的质量传递，从而影响石油的生产 尤其是汽油