Clay mineral diagenesis in alternating mudstone-sandstone beds from Late Palaeozoic strata of the Anadarko Basin, United States,Geological Journal

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Clay mineral diagenesis in alternating mudstone-sandstone beds from Late Palaeozoic strata of the Anadarko Basin, United States
Geological Journal ( IF 1.4 ) Pub Date : 2022-09-19 , DOI: 10.1002/gj.4582
Giovanni Zanoni _{1,

2} , Branimir Šegvić ₁ , Dustin E. Sweet ₁

Affiliation

Closely interbedded mudstone and sandstone are rarely the focus of clay mineral diagenetic studies; as such, it is not understood if these various rock types follow the same or different diagenetic pathway(s) during burial. Over a depth span of ~2,300 to 4,200 m, 95 core samples of alternating Pennsylvanian mudstone/sandstone from the hydrocarbon-rich Anadarko Basin in Oklahoma have been characterized petrographically, mineralogically, and chemically. The investigated fine-grained sediment is argillaceous to siliceous mudstone, dominated by Illite/mica and mixed-layer illite–smectite. The sandstone is variably classified as quartz and mudclast-rich litharenite to sub-litharenite, which is commonly carbonate-cemented. This contribution provides evidence for a very similar diagenetic evolution of the clay mineral assemblages across all rock types despite the discrepancies in porosity and permeability of the host rock. We posit that the incorporation of micrometre-scale mudclasts through bioturbation of the sandstone may explain the relatively uniform compositional characteristics of illite–smectite, chlorite, and kaolinite. Inferences are drawn from a detailed clay mineral quantification of these interbedded lithologies aid to our understanding of the clay mineral distribution and speciation in Pennsylvanian strata of the Anadarko Basin, which further helps to constrain the reservoirs' physical, chemical, and structural properties.

中文翻译：

美国阿纳达科盆地晚古生代泥砂岩交替层粘土矿物成岩作用

紧密互层的泥岩和砂岩很少是粘土矿物成岩研究的重点；因此，尚不清楚这些不同类型的岩石在埋藏期间是否遵循相同或不同的成岩途径。在约 2,300 至 4,200 米的深度范围内，来自俄克拉荷马州富含碳氢化合物的阿纳达科盆地的 95 个宾夕法尼亚纪泥岩/砂岩交替岩芯样本已在岩相学、矿物学和化学方面进行了表征。调查的细粒沉积物为泥质至硅质泥岩，以伊利石/云母和混层伊蒙脱石为主。砂岩被不同地分类为富含石英和泥屑碎屑的岩屑岩到次岩屑岩，后者通常是碳酸盐胶结的。这一贡献为所有岩石类型的粘土矿物组合的成岩演化提供了非常相似的证据，尽管主岩的孔隙度和渗透率存在差异。我们假设通过砂岩的生物扰动掺入微米级泥屑可以解释伊利石-蒙脱石、绿泥石和高岭石相对均匀的成分特征。从这些互层岩性的详细粘土矿物量化中得出的推论有助于我们了解阿纳达科盆地宾夕法尼亚地层的粘土矿物分布和形态，这进一步有助于限制储层的物理、化学和结构特性。我们假设通过砂岩的生物扰动掺入微米级泥屑可以解释伊利石-蒙脱石、绿泥石和高岭石相对均匀的成分特征。从这些互层岩性的详细粘土矿物量化中得出的推论有助于我们了解阿纳达科盆地宾夕法尼亚地层的粘土矿物分布和形态，这进一步有助于限制储层的物理、化学和结构特性。我们假设通过砂岩的生物扰动掺入微米级泥屑可能解释了伊利石-蒙脱石、绿泥石和高岭石相对均匀的成分特征。从这些互层岩性的详细粘土矿物量化中得出的推论有助于我们了解阿纳达科盆地宾夕法尼亚地层中的粘土矿物分布和形态，这进一步有助于限制储层的物理、化学和结构特性。

更新日期：2022-09-19

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