1887
Volume 32, Issue 1
  • ISSN: 1354-0793
  • E-ISSN:

Abstract

The organic-rich shale facies of the Lower Jurassic Datta Formation in the Upper Indus Basin in Pakistan was studied using geological and geochemical investigations to assess the unconventional shale oil reservoir potential. The Datta shale facies is a promising oil-prone stratum, consisting of total organic carbon (TOC) exceeding 2 wt%, and primarily comprising Type II and II/III kerogens, with a hydrogen index (HI) exceeding 250 mgHC g TOC. The Datta shale facies is also characterized by higher free hydrocarbon (S) content than TOC, resulting in a high oil saturation index (OSI) between 30.81 and 298.7 mgHC g TOC, wherein the high OSI of more than 100 mgHC g TOC indicates a strong potential for oil production. This finding is consistent with the current thermally mature oil window, which ranges between early mature and peak mature, as supported by vitrinite reflectance (%VR) values of up to 0.82. This main oil-generation window leads to the conversion of extensive hydrogen-rich kerogen for commercial oil generation, with a transformation ratio (TR) of up to 65%, as demonstrated by 1D basin modelling. Maximum oil generation, with TR values exceeding 50%, leads to high pressure and results in microfracture pores in the Datta shale facies. The presence of non-fabric-fracture pores is confirmed by high-resolution petrographical scanning electron microscopy (SEM). Consequently, these findings highlight that the Datta shale facies should be considered for use as an unconventional shale oil reservoir, with the suggestion of hydraulic fracturing techniques for production purposes.

© 2026 The Author(s). Published by The Geological Society of London for GSL and EAGE. All rights, including for text and data mining (TDM), artificial intelligence (AI) training, and similar technologies, are reserved. For permissions: https://www.lyellcollection.org/publishing-hub/permissions-policy. Publishing disclaimer: https://www.lyellcollection.org/publishing-hub/publishing-ethics

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2026-04-21

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Multi-scale geochemical, mineralogical and petrographical dataset for the shale oil-bearing reservoir potential: an example from the Lower Jurassic Datta Formation in the Upper Indus Basin, Pakistan
Petroleum Geoscience 32, petgeo2025-057 (2026); https://doi.org/10.1144/petgeo2025-057
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