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首页> 外文期刊>Journal of Geological Research >A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM
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A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM

机译：北达科他州威利斯顿盆地三叉构造（上泥盆统）的岩石学研究：基于薄层分析，XRD和SEM

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摘要

Deeply buried below 8,000 ft, the Three Forks Formation in North Dakota displays a variety of interesting diagenetic characteristics including dolomitization and hematite precipitation. Samples from three lithofacies are analyzed by thin section and SEM petrography and combined bulk and clay XRD analyses. Key aspects controlling the porosity and permeability of this formation are revealed by focusing on the detail mineralogy, rock type and diagenetic mineral distribution, and overall reservoir quality. Results prove that the Three Forks mineralogy is dominated by dolomite, along with substantial hematite, monocrystalline quartz, and mica flakes with trace feldspar, calcite, and pyrite. Clays mainly consist of illite together with minor chlorite and kaolinite and are associated with the scattered clasts. The reservoir quality is controlled by intercrystalline, rare microvuggy, and microporosity types that result from diagenetic and depositional events. Three stages of the dolomitization process are identified and discussed. Our hypothesis is that dolomitization commenced soon after deposition and was pervasive as no original carbonate texture is detectable.
机译：北达科他州的三叉组深埋在8,000英尺以下，显示出多种有趣的成岩特征，包括白云石化作用和赤铁矿沉淀。通过薄片和SEM岩相分析以及结合的体积和粘土XRD分析来分析来自三个岩相的样品。通过关注详细的矿物学，岩石类型和成岩矿物分布以及整体储层质量，揭示了控制该地层的孔隙度和渗透率的关键方面。结果证明三叉矿物学以白云石，大量的赤铁矿，单晶石英和云母片，微量长石，方解石和黄铁矿为主。粘土主要由伊利石，次氯酸盐和高岭石组成，并且与分散的碎屑有关。储层质量受成岩作用和沉积作用所致的晶间，稀有微孔洞和微孔类型控制。确定并讨论了白云石化过程的三个阶段。我们的假设是白云石化作用在沉积后不久就开始了，并且普遍存在，因为没有原始的碳酸盐质地被检测到。

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