Himalayan Geology, Vol. 41 (2), 2020, pp. 208-221, Printed in India
Reservoir Characterization by using Petrophysical-Electrofacies Analyses and Subsurface Structural Interpretation of the Nandpur Gas Field, Middle Indus Basin, Pakistan
NAVEED AKRAM1, NISAR AHMED2*, MUHAMMAD S. KHAN3,4, MUHAMMAD I. EHSAN5, MUHAMMAD A. GUL1, MUBASHER AHMAD5
1School of Earth and Space Sciences, University of Science and Technology China, Hefei, Anhui, 230026, PR China
2Department of Energy Resources, University of Stavanger, 4036-Stavanger, Norway
3Key Laboratory of Digital Land and Resources, East China University of Technology, Nanchang, 330013, China
4Department of Earth Sciences, Comsats University, Islamabad, Abbottabad, Pakistan
5Institute of Geology, University of the Punjab, Lahore, 54590, Pakistan
*Email (Corresponding author): ahmedseis23@gmail.com
Abstract: The main objective of this geoscientific study is to evaluate subsurface structures and reservoir characteristics of the Cretaceous Sand in the Nandpur gas field located in the Punjab Platform, Middle Indus Basin, Pakistan. Accurate prediction of structural traps and petrophysical properties can assist the industry professionals to discover and develop new hydrocarbon fields. However, it is quite challenging to predict them accurately due to complex and heterogeneous conditions of the subsurface. We have used seismic reflection data along with complete suites of well logs. For structural interpretation, four prominent horizons are marked based on character and continuity of seismic traces. Five north-south dipping strike-slip faults bounded negative flower structures are interpreted on seismic section, which can be considered as the most favorable trap for hydrocarbon accumulation. The Cretaceous Lumshiwal Formation (sandstone) acts as potential reservoir rock, which is further confirmed through well logs analyses. Time and depth contour maps further reveal that the subsurface structure dips at a gentler angle toward north-west direction and high zone present in the SE part of the contour maps might be possible location of hydrocarbon entrapment. This location is further confirmed by the presence of the well Nandpur-09. Well logs analyses revealed that the reservoir rock has almost average effective porosity 18 %, volume of shale 6%, saturation of water 21 % and saturation of hydrocarbons is 57 %. The results clearly indicate the hydrocarbons potential and significance of the study area. In the present study, three electrofacies are also examined for the Lumshiwal Formation in the Nandpur 09 well by investigating the well logs data and their dendrogram cluster analysis based on statistical and mathematical codes. This article will be important in exploration activities in this part of Middle Indus Basin of Pakistan.
Keywords: Seismic interpretation; 2D seismic field data; Reservoir property estimation; well logging; hydrocarbons prediction.
