Integrating the palynostratigraphy, petrography, X-ray diffraction and scanning electron microscopy data for evaluating
- PDF / 2,362,665 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 56 Downloads / 183 Views
ORIGINAL PAPER-EXPLORATION GEOLOGY
Integrating the palynostratigraphy, petrography, X‑ray diffraction and scanning electron microscopy data for evaluating hydrocarbon reservoir potential of Jurassic rocks in the Kala Chitta Range, Northwest Pakistan Sajjad Ahmad1 · Bilal Wadood2,3 · Suleman Khan1 · Sohail Ahmed1 · Fahad Ali4 · Abdus Saboor1 Received: 2 April 2020 / Accepted: 11 July 2020 © The Author(s) 2020
Abstract In this paper, we present the palynostratigraphy, petrography, scanning electron microscopy (SEM) and X-ray diffraction (XRD) investigations to evaluate hydrocarbon reservoir potential of the Jurassic clastic-carbonate mixed sequence of the Kala Chitta Range, northwest Pakistan. The chronostratigraphic sub-divisions of the diverse lithologies within the sequence were made by using palynostratigraphy. The clastic dominated sequence of Datta Formation was assigned Toarcian-Bajocian age, while the Shinawari Formation was deposited during the Bajocian-middle Bathonian. The carbonate shoal facies of the Samana Suk Formation showed late Bathonian-Tithonian time of deposition. The primary and secondary porosities augmented by the plug porosity and permeability data suggest that the sandstone of Datta Formation is an excellent reservoir. The dominance of diverse matrix within the Shinawari Formation occluded the primary porosity. However, based on dissolution and dolomitization, the Shinawari Formation is categorized as a moderate reservoir. The dominance of various types of matrix and cement with superimposed burial diagenesis has occluded the primary porosity within the Samana Suk Formation. However, the diagenetic dissolution and dolomitization during the telogenetic stage were supported by the SEM and bulk geochemical data. Such diagenetic overprinting has significantly enhanced the reservoir potential of the unit. Keywords Jurassic · Palynostratigraphy · Reservoir · Porosity
Introduction * Sajjad Ahmad [email protected] Bilal Wadood [email protected] Suleman Khan [email protected] Fahad Ali [email protected] Abdus Saboor [email protected] 1
Department of Geology, University of Peshawar, Peshawar 25120, Pakistan
2
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
3
Department of Geology, University of Swabi, Anbar‑Swabi 23561, Pakistan
4
Department of Geology, Bacha Khan University, Charsadda 24420, Pakistan
Pakistan has over 9 billion barrels of petroleum oil and 105 trillion cubic feet (TCF) natural gas (including shale gas) reserves (according to the data of United States Energy Information Administration EIA 2013). The recoverable oil reserves stand at approximately 340 million barrels, and the gas reserves are 20 TCF (MPCL 2020). The prevailing energy crises in Pakistan calls for immediate attention to device novel strategies for the exploration and exploitation of the hidden and existing hydrocarbon resources and to assess the contribution of novel strategies for Pakistan’s ener
Data Loading...
