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首页> 外文期刊>Marine and Petroleum Geology >Clay mineral diagenesis and quartz cementation in mudstones: The effects of smectite to illite reaction on rock properties
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Clay mineral diagenesis and quartz cementation in mudstones: The effects of smectite to illite reaction on rock properties

机译：泥岩中的粘土矿物成岩作用和石英胶结作用：绿土到伊利石反应对岩石性质的影响

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The Late Cretaceous to Early Tertiary sequence of the Voring and Mere Basins from the Norwegian Sea has been examined with respect to mineralogy based on 319 cutting samples from five wells. A clear relationship between mineralogy and well log data is demonstrated. A significant change with respect to velocity, porosity and density occurs within the depth interval corresponding to 80-90 °C At shallow depths/temperatures (<2.0 km/70 °C), compaction is mainly mechanical and the physical properties are similar to what has been measured by experimental compaction of mudstones. At greater depths, however, the log derived velocities and densities are higher than those produced by experimental compaction indicating significant chemical compaction. XRD analyses show a progressive alteration of smectite to illite (S-I) within this depth/temperature interval which results in the release of significant amounts of silica into solution. Detrital silt and fine-grained quartz showed no secondary quartz overgrowths. These grains are isolated within a clay matrix and surrounded by clay minerals, thus limiting the available surface area and pore space for quartz overgrowths. Chemical analyses (XRF) indicate that silica is conserved within this depth interval, and the amount released from S-I alteration was locally precipitated. Field emission gun-scanning electron microscopy (FEG-SEM) and cathode luminescence (CL) identified authigenic micro-crystalline quartz cement within the clay matrix at temperatures above ~85 °C. This is accompanied by an increase in velocity and density indicating that the S-I reaction and the precipitation of authigenic quartz caused a significant change in the rock stiffness.
机译：挪威海的Voring和Mere盆地的白垩纪晚期至第三纪早期序列已根据5口井的319个切割样品进行了矿物学研究。证明了矿物学和测井数据之间的明确关系。在对应于80-90°C的深度区间内，速度，孔隙率和密度发生了显着变化。在较浅的深度/温度（<2.0 km / 70°C）下，压实主要是机械的，物理性质类似于已通过实验压实泥岩进行了测量。然而，在更大的深度处，对数导出的速度和密度高于实验压实产生的速度和密度，这表明化学压实显着。 XRD分析表明，在该深度/温度区间内，蒙脱石逐渐转变为伊利石（S-1），这导致大量的二氧化硅释放到溶液中。碎屑粉砂和细粒石英显示没有二次石英过度生长。这些颗粒被隔离在粘土基质中并被粘土矿物包围，因此限制了石英过度生长的可用表面积和孔隙空间。化学分析（XRF）表明二氧化硅在该深度间隔内是保守的，并且从S-1改变释放的量局部沉淀。场发射枪扫描电子显微镜（FEG-SEM）和阴极发光（CL）在高于约85°C的温度下确定了粘土基质中的自生微晶石英水泥。这伴随着速度和密度的增加，这表明S-1反应和自生石英的沉淀引起了岩石刚度的重大变化。

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