Pore fluid evolution in sedimentary basins: integrated sedimentology and geochemistry of carbonate reservoirs

沉积盆地孔隙流体演化：碳酸盐岩储层综合沉积学和地球化学

• 批准号: 41663-2012
• 负责人: AlAasm, Ihsan
• 金额: $ 1.97万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=568848
• 关键词: Pore; fluid; evolution; sedimentary; basins

Despite considerable research over the last two decades on the origin of diagenetic fluids involved limestone diagenesis and dolomitization, the debate about timing and chemistry of these fluids and the extent to which massive dolomites formed in near surface environments as opposed to formation of dolomite bodies at variable burial depths by hydrothermal and burial processes. These dolostones and associated limestone sequences host significant accumulations of oil and gas as well as extensive lead and zinc deposits. The present proposal is part of an ongoing research program, both conceptually and experimentally, on the chemistry, source(s) of diagenetic fluids and timing of fluid flow events in sedimentary basins. It is aimed to put special emphasis on fracture diagenesis, because fractures are often the primary conduits for diagenetic fluids. These fluids do not only result in fracture mineralization but may also induce important diagenetic modifications to the host carbonate rocks. Quantification of the fluid flow using field, structural, petrographic and geochemical tools can be also used to develop conceptual models for the spatial and temporal distribution and connectivity of reservoir porosity and permeability on a regional basinal scale. The proposed research program for the next 5 years will have the following objectives: (1) a better quantification of the main diagenetic events and their responsible originating fluids in sedimentary basins; (2) determination of the relationship between the fractures and deformational or tectonic events (i.e. fracture diagenesis); (3) numerical simulation of fluid/rock interaction (e.g. using reactive transport modeling); (4) determination of patterns of paleo-fluid flow (e.g. numerical modeling); and, (5) unravel the impact of diagenetic events porosity evolution. These objectives can be achieved through careful examination of textural parameters, mapping of regional and local distribution of diagenetic and structural components, geochemistry (stable and radiogenic isotope measurements, fluid inclusions), burial and thermal history curves and quantitative basin modeling techniques.

尽管过去20年来对成岩流体的起源涉及石灰岩成岩作用和白云石化作用进行了大量的研究，但关于这些流体的时间和化学以及块状白云石在多大程度上是在近地表环境中形成的争论，与通过热液和埋藏过程在不同埋藏深度形成白云岩矿体的情况相反。这些白云岩和伴生的石灰岩序列蕴藏着大量的石油和天然气，以及广泛的铅和锌矿床。本建议是正在进行的关于沉积盆地中成岩流体的化学、来源(S)和流体流动事件的时间的概念和实验研究计划的一部分。它的目的是特别强调裂缝成岩作用，因为裂缝往往是成岩流体的主要通道。这些流体不仅导致裂缝成矿，而且可能对寄主碳酸盐岩进行重要的成岩改造。利用野外、构造、岩石学和地球化学工具对流体流动进行量化，也可以用来建立概念模型，在区域盆地尺度上研究储集层孔隙度和渗透率的时空分布和连通性。未来5年的研究计划将有以下目标：(1)更好地量化沉积盆地中的主要成岩事件及其负责的原始流体；(2)确定裂缝与变形或构造事件(即裂缝成岩作用)之间的关系；(3)流体/岩石相互作用的数值模拟(如使用反应输运模拟)；(4)确定古流体流动模式(如数值模拟)；以及(5)揭示成岩事件对孔隙度演化的影响。这些目标可以通过仔细检查结构参数、绘制成岩和构造成分的区域和局部分布图、地球化学(稳定和放射性同位素测量、流体包裹体)、埋藏和热历史曲线以及定量盆地模拟技术来实现。