Fluids in the Upper Continental Crust: Static or Dynamic?

上大陆地壳中的流体:静态还是动态?

基本信息

  • 批准号:
    9909277
  • 负责人:
  • 金额:
    $ 16.4万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2000
  • 资助国家:
    美国
  • 起止时间:
    2000-03-15 至 2004-02-29
  • 项目状态:
    已结题

项目摘要

9909277DemingA major area of uncertainty in our knowledge of crustal hydrodynamics concems the temporal and spatial scales over which overpressures in the continental crust are generated, maintained, and dissipated. At the present time there is no consensus in either academic or industry circles to several fundamental questions. What is the cause of overpressuring in older sedimentary basins which have not undergone active sedimentation for hundreds of millions of years? Do pressure seals exist? If they exist, how low must rock-permeability be to form a seal? If pressure seals exist, are they created by diagenetic alteration, or are they in fact gas capillary seals?The Anadarko Basin in southwestem Oklahoma will be used as a natural laboratory to study the conditions under which high fluid pressures may be generated and contained. The Anadarko Basin is anomalous, because it contains extensive areas of abnormally high fluid pressures, yet it has been tectonically quiescent for more than 100 Ma. The problem will be approached from a conceptual framework which postulates two end-member conceptions of crustal hydrogeology. Static hypotheses explain the existence of high fluidpressures in the crust by invoking pressure seals, rock units that are essentially impermeable over an appropriate time scale. Dynamic hypotheses explain the existence of overpressures in the crust as a transient imbalance caused by a geologic process (e.g., hydrocarbon generation) creating overpressures faster than they may be dissipated from low-permeability rocks. To distinguish between these alternative hypotheses, or to determine if they are in fact end-member behaviors of a continuum, well log and core data will be gathered and used to characterize the thermal, hydrologic, and geologic nature of the basin. Models of pressure generation and dissipation will then be used to test different hypotheses and discriminate between contrasting visions of basinal fluid regimes.Obtaining an understanding of how overpressures form and dissipate in the upper continental crust could lead to a better understwiding of many important physical, chemical, and mechanical processes (e.g., diagenesis, compaction, hydrocarbon generation and migration, seismicity) that take place in the continental crust as well as an understanding of how the physical properties (e.g. porosity, permeability) of crustal rocks vary in time, space, and scale.
9909277戴明在我们对地壳流体动力学的认识中,一个主要的不确定领域涉及大陆地壳超压产生、维持和消散的时间和空间尺度。 目前,学术界和工业界对几个基本问题都没有达成共识。 在数亿年来没有经历过活跃沉积作用的古老沉积盆地中,超压的原因是什么? 是否存在压力密封? 如果它们存在,那么岩石的渗透性必须有多低才能形成密封? 如果存在压力封闭,它们是由成岩蚀变作用形成的,还是实际上是气体毛细管封闭?俄克拉荷马州西南部的阿纳达科盆地将被用作天然实验室,研究可能产生和控制高流体压力的条件。 阿纳达科盆地是异常的,因为它包含了广泛的地区异常高的流体压力,但它已经超过100 Ma的构造静止。 这个问题将从假设地壳水文地质学两个端元概念的概念框架来探讨。 静态假说解释了地壳中存在的高流体压力,通过调用压力密封,岩石单元在适当的时间尺度上基本上是不可渗透的。 动力学假说将地壳中超压的存在解释为由地质过程引起的瞬时不平衡(例如,烃生成)产生超压的速度比它们从低渗透性岩石中消散的速度更快。 为了区分这些备选假设,或确定它们是否实际上是连续体的端元行为,将收集测井和岩心数据,并用于表征盆地的热、水文和地质性质。 压力产生和消散的模型将被用来检验不同的假设,并区分盆地流体状态的不同观点。了解上陆壳超压如何形成和消散,可以更好地理解许多重要的物理、化学和机械过程(例如,成岩作用、压实作用、烃类生成和迁移、地震活动),以及了解地壳岩石的物理性质(如孔隙度、渗透率)如何在时间、空间和规模上发生变化。

项目成果

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David Deming其他文献

Water in the Bible
圣经中的水
Hydrogeology: A Short History, Part 2
  • DOI:
    10.1111/j.1745-6584.2004.t01-14-.x
  • 发表时间:
    2004-11
  • 期刊:
  • 影响因子:
    2.6
  • 作者:
    David Deming
  • 通讯作者:
    David Deming
Allocative Skill
分配技巧
  • DOI:
    10.2139/ssrn.4567680
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Andrew Caplin;David Deming;Søren Leth;Ben Weidmann
  • 通讯作者:
    Ben Weidmann
On Measurement of the Neutron Decay Time in a Helium Vessel Parameters of experiment on ultracold neutrons storage in a vessel with super uid
氦容器中子衰变时间的测量 超级流体容器超冷中子储存实验参数
  • DOI:
  • 发表时间:
    2010
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Alexander M. Gelber;A. Isen;Jay Bhattacharya;Hanley Chiang;David Cutler;David Deming;Mark Duggan;Olivia Mitchell;Michael Puma;Dan Sacks;Todd Sinai;Danny Yagan
  • 通讯作者:
    Danny Yagan
Guns and vaginas: A personal perspective on free speech and sexual harassment in Oklahoma

David Deming的其他文献

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{{ truncateString('David Deming', 18)}}的其他基金

Thermal Anomalies and Fluid Flow in the Continental Crust
大陆地壳中的热异常和流体流动
  • 批准号:
    9219886
  • 财政年份:
    1993
  • 资助金额:
    $ 16.4万
  • 项目类别:
    Standard Grant

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