Reservoir attributes of a hydrocarbon-prone sandstone complex: case of the Pab Formation (Late Cretaceous) of Southwest Pakistan

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• 作者：Muhammad Umar ; Abdul Salam Khan ; Gilbert Kelling…
• 关键词：Porosity ; Sandstone ; Facies associations ; Diagenesis ; Texture
• 刊名：Arabian Journal of Geosciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：9
• 期：1
• 全文大小：6,991 KB
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• 作者单位：Muhammad Umar (1) (5)
  Abdul Salam Khan (2)
  Gilbert Kelling (3)
  Henrik Friis (4)
  Akhtar Muhammad Kassi (5)
  
  1. Department of Earth Sciences, COMSATS Institute of Information Technology, Abbottabad, Pakistan
  5. Department of Geology, University of Balochistan, Quetta, Pakistan
  2. Centre of Excellence in Mineralogy, University of Balochistan, Quetta, Pakistan
  3. School of Physical & Geographical Sciences, University of Keele, Staffordshire, UK
  4. Department of Geoscience, Aarhus University, Aarhus, Denmark
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

Links between the architectural elements of major sand bodies and reservoir attributes have been explored in a field study of the hydrocarbon-yielding Late Cretaceous Pab Formation of southwest Pakistan. The lithofacies and facies associations represented in the Pab Formation are the main determinants of its reservoir properties. Thus, thick, vertically connected and laterally continuous sand packets have moderate-to-high mean porosities (10–13 %) in fluviodeltaic, shoreface, shelf delta, submarine channel, and fan-lobe facies associations while deeper shelf and basin floor sand bodies yield significantly lower porosities (4–6 %). Overall, in the Pab arenites, porosity values increase with increasing grain size and better sorting. The varying sand-shale ratios encountered in different sectors of the Pab outcrop are also petrophysically important: Sequences displaying high ratios yield higher bulk porosity values than more shale-rich successions. Diagenetic studies of Pab sandstones reveal that intense mechanical compaction and cementation have reduced primary porosity and reservoir quality. Conversely, dissolution of detrital feldspar grains and volcanic fragments during burial and later uplift of these arenites has generated significant secondary porosity.