1887

Abstract

Summary

As part of a study to investigate methods to enhance pore/crack connectivity between the shale matrix and the induced fractures, we have investigated the matrix microstructure of an exposed analogue of the Jurassic Posidonia shales in the Dutch sub-surface. A combination of Precision-Ion-Polishing and Scanning Electron Microscopy has been used to image the in-situ porosity and mineralogy in shale samples from Whitby (UK), which are an analogue for the Dutch Posidonia shale. First results show a fine-grained mudstone with cm-sub-mm scale stratification. The section at Whitby can be divided into a clay matrix dominated upper half and a coarser grained, calcite-rich, lower half of the section. Commonly occurring minerals are pyrite, calcite (fossils, grains and cement), quartz, mica and dolomite. Organic matter content varies from 0 – 2 % in the calcite dominated layers to 5 – 18% in the clay matrix dominated layers. The most porous phases are the clay matrix and calcite fossils. This microstructural study shows which intervals within Posidonia shale contain the largest porosity and organic matter contents for sweet spot analyses and forms a basis for future research on enhancing connectivity between the pores and induced fractures

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/content/papers/10.3997/2214-4609.20141056
2014-06-16
2024-04-18
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References

  1. Bour, I., Mattioli, E., and Pittet, B.
    [2007] Nannofacies analysis as a tool to reconstruct paleoenvironmental changes during the Early Toarcian anoxic event, Palaeogeography, Palaeoclimatology, Palaeoecology, 249, 58–79.
    [Google Scholar]
  2. Desbois, G., Urai, J.L. and Kukla, P.A.
    [2009] Morphology of the pore space in claystones, eEarth Discuss, 4, 1–19.
    [Google Scholar]
  3. GhadeerS.G. and Macquaker, J.H.S.
    [2012] The role of event beds in the preservation of organic carbon in fine-grained sediments, Marine and Petroleum Geology, 35, 309–320.
    [Google Scholar]
  4. Herber, R. and de Jager, J.
    [2010] Oil and Gas in the Netherlands – Is there a future?, Netherlands Journal of Gesciences, 89–2, 119–135.
    [Google Scholar]
  5. Hesselbo, S.P., Gröcke, D.R., Jenkyns, H.C., Bjerrum, C.J., Farrimond, P., Morgans Bell, H.S. and Green, O.R.
    [2000] Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event, Nature, 406, 392–395.
    [Google Scholar]
  6. Houben, M.E., Desbois, G. and Urai, J.L.
    [2013] Pore morphology and distribution in the Shaly facies of Opalinus Clay (Mont Terri, Switzerland), Applied Clay Science, 71, 82–97.
    [Google Scholar]
  7. Klaver, J., Desbois, G., Urai, J.L. and Littke, R.
    [2012] BIB-SEM study of the pore space morphology in early mature Posidonia Shale from the Hils area, Germany. International Journal of Coal Geology, 103, 12–25.
    [Google Scholar]
  8. Littke, R., Baker, D.R., Leythaeuser, D., Rullkötter, J.
    [1991] Keys to the depositional history of the Posidonia Shale (Toarcian) in the Hils Syncline, northern Germany, From: Tyson, R.V., Pearson, T.H. (eds.)Modern and Ancient continental shelf anoxia, Geological special publication, 58, 311–333.
    [Google Scholar]
  9. McArthur, J.M., Algeo, T.J., van de Schootbrugge, B., Li, Q. and Howarth, R.J.
    [2008] Basinal restrictioin, black shales, Re-Os dating, and the Ealry Toarcian (Jurassic) oceanic, anoxic event. Paleoceanography, 23, PA4217.
    [Google Scholar]
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