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

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.

Dating and tectonostratigraphy of the Early Jurassic rift delta at the northwestern margin of the Indian Plate, Pakistan

“…Previously Early Jurassic age has been assigned to the Datta Formation based on superposition (Shah, 2009). Later on in Kalachitta area, the Toarcian‐Bajocian age was assigned to the unit based on terrestrial palynomorphs (Ahmad et al, 2020). This study is the first of its kind to assign new ages to the deposition of the Datta Formation in the western Salt Range.…”

The sedimentological and stratigraphical analysis of the Paleocene to Early Eocene Dungan Formation, Kirthar Fold and Thrust Belt, Pakistan: implications for reservoir potential

“…Taghavi et al 2006). In most of the places, the porous skeletal grains are also occupied by micrite and has weakened the porosity reservoir quality (Wadood et al 2019;Ahmad et al 2020). The cementation, an important diagenetic process (Wilson and Stanton 1994) is most prominent in the Milliolid-Alveolina-Red algal packstone microfacies (MF-2).…”

Seismostratigraphic Interpretation of Upper Cretaceous Reservoir from the Carpathian Foreland, Southern Poland

“…Mesozoic carbonate formations are the subject of research in many regions of the world because they are a good collector for the accumulation of oil and gas [1][2][3][4][5][6][7][8][9][10]. In the area of the central part of the Carpathian Foreland, the carbonate complex of the Upper Jurassic and Lower Cretaceous sediments is relatively well recognized [11][12][13][14][15][16][17][18].…”