The Vienna Basin is a major hydrocarbon province with a long exploration history. Within the basin, secondary migration from Upper Jurassic source rocks into stacked Middle Miocene (Badenian) sandstone reservoirs was formerly considered to have occurred almost entirely along major fault zones. However recent exploration data has suggested that in areas where no major faults are present, oil may have migrated vertically through the sandy mudstone intervals separating individual reservoir units, which are therefore imperfectly sealed. In order to investigate possible secondary migration through the semi‐permeable mudstones, this study links variations in gross depositional environment (GDE) to variations in mudstone properties (e.g. mineralogy and pore size distribution). The study focussed on the mudstones which seal reservoir sandstones referred to locally as the “8.TH” and “16.TH” units. The bulk mineralogical composition of 56 mudstone and sandy mudstone (and minor intercalated muddy sandstone) samples from seal layers in 22 wells was studied by X‐ray diffraction analysis, broad ion beam – scanning electron microscopy (BIB‐SEM), mercury intrusion porosimetry (MICP) and N₂ adsorption. These data are interpreted in the context of GDE maps of the Vienna Basin which were previously established using seismic and well log data.

中文翻译：

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海豹岩分析中的矿物学，BIB-SEM和岩石物理数据：以奥地利维也纳盆地为例

维也纳盆地是一个重要的油气大省，具有悠久的勘探历史。在该盆地内，以前认为是从上侏罗统烃源岩到堆积的中中新世（巴甸）砂岩储层的二次迁移几乎全部发生在主要断层带上。但是，最近的勘探数据表明，在没有大断层的地区，石油可能已经通过分隔各个储层单元的砂质泥岩层段垂直地运移，因此密封不完善。为了研究通过半透性泥岩可能发生的二次运移，本研究将总沉积环境（GDE）的变化与泥岩性质（例如矿物学和孔径分布）的变化联系起来。研究集中在封闭储集砂岩的泥岩上，在当地被称为“ 8.TH”和“ 16.TH”单元。通过X射线衍射分析，宽离子束-扫描电子显微镜（BIB-SEM），压汞法（压裂法）研究了22口井密封层中56个泥岩和砂质泥岩（以及少量插层的泥质砂岩）样品的总体矿物学组成。 MICP）和N₂吸附。这些数据是在维也纳盆地GDE地图的背景下解释的，该地图以前是使用地震和测井数据建立的。