Petroleum play analysis of the Jurassic sequence, Meyal-field, Potwar basin, Pakistan

Ghazi, Shahid; Aziz, Tahir; Khalid, Perveiz; Sahraeyan, Mohammad

doi:10.1007/s12594-014-0183-2

Cited by 5 publications

(13 citation statements)

References 3 publications

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“…2. Previous studies and stratigraphy of the area show that rocks from Precambrian to quaternary age are present in Potwar sub-basin [26,29,30]. Based on seismic interpretation, Ratana-02 well was drilled on seismic line NP86-04 in limestone of Chorgali Formation, which is the reservoir rock in study area.…”

Section: Geology Of the Areamentioning

confidence: 99%

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An Integrated Seismic Interpretation and Rock Physics Attribute Analysis for Pore Fluid Discrimination

et al. 2015

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Accurate prediction of subsurface structures, lithologies and pore fluids, is of great interest for petroleum prospecting and reservoir characterization. Seismic reflection data are widely used to mark subsurface structures and lithologies. However, only seismic data are not sufficient to mark fluid heterogeneities present into the pores. Therefore, the use of integrated approach is vital to map subsurface heterogeneities with more accuracy. Based on seismic interpretation, the limestone of Chorgali Formation present in Ratana area of Northern Potwar, Pakistan is interpreted as reservoir rock. Structural interpretation revealed that the study area lies in compressional regime and structures formed are thrust and popups. The reservoir properties such as lithology, porosity, permeability, depositional environments, shale volume, fluid saturation, net pay thickness are determined from petrophysical analysis which confirms that reservoir characteristics of Chorgali limestone are enough to permit hydrocarbon production. Fluid substitution modeling is used to estimate different rock physics attributes such as compressibility, Lame's parameters and their product with density, P to S-wave velocity ratio, impedances and Poisson's ratio are computed as a function of pore fluid type (oil, gas, brine etc.). Sensitivity analysis is performed to derive fluid indicator coefficient which indicates the most appropriate and sensitive rock physics attribute that can be crossplotted to discriminate the rock saturated with different pore fluids (gas/brine/oil).

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Section: Geology Of the Areamentioning

confidence: 99%

“…1) is highly rich by oil and gas reservoirs [26,27]. Chorgali formation of Eocene age was drilled as potential calcite reservoir in Ratana area of Potwar sub-basin (Fig.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Seismic Interpretation and Rock Physics Attribute Analysis for Pore Fluid Discrimination

et al. 2015

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“…The contact relationship between the Mesozoic and the Paleocene successions is unconformable [33]. The data from three wells illustrate that Cretaceous is miss- ing in this area as the Paleocene Hangu Formation directly overlies the Datta Formation [2,12,22,34] (Figure 2). Moreover, calcareous claystone of the Nammal Formation making the beginning of the Lower Eocene, followed by massive bedded limestone of Sakesar Formation which is overlain by dolomitic limestone and calcareous claystone/shale of the Chor Gali Formation [35][36][37][38][39].…”

Section: Geological Settingmentioning

confidence: 99%

“…The shale of the Nammal Formation have been analyzed as a major producer of oils to the reservoirs of Dhulian (Chor Gali-Sakesar), Joya Mair (Sakesar), Khaur (Murree Sandstone) and Balkassar fields (Sakesar) [21] (Figure 2). Jurassic variegated sediments are deliberated as second possi-ble potential source rock actively contributing at the generation of oil in this area [22] (Figure 2). This unit provided oil to the Meyal (Jurassic, Paleocene and Eocene) and Dhulian fields (Variegated beds and Lockhart).…”

Section: Petroleum Geologymentioning

confidence: 99%

“…Potwar Basin located in Sub-Himalaya division contains significant hydrocarbons restricted in compressional as well as transpressional structures [12]. A number of researchers [2,21,22] proposed that at the level of Eocene; geologic structure depicts a general trend in east-west direction. The major structures comprise anticlines constrained by reverse faults, pop-up and salt cored.…”

Section: Introductionmentioning

confidence: 99%

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2D Seismic Interpretation of the Meyal Area, Northern Potwar Deform Zone, Potwar Basin, Pakistan

et al. 2019

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Meyal Field is considered as one of the chief hydrocarbon producing fields in the Potwar Basin, Pakistan. The present research emphasize on the subsurface structures affecting the Mesozoic-Cenozoic successions exclusively foremost reservoir units comprising the Eocene Chor Gali and Sakesar formations. Data from six seismic lines and three wells (aligned with those lines) have been deliberated comprehensively with remarkable and tremendous calibration. Five prominent and imperative reflectors specifically the Permian, Triassic, Jurassic, Paleocene and Eocene successions were interpreted through seismic tactics. Time structure maps were equipped on the basis of two-way travel time (TWT) of the seismic line. Likewise, four isopach maps portrayed the thickness discrepancy of prospective hydrocarbon strata. Structurally, analytical section reveals that the Meyal anticline is a plunging and faulted anticline. The pop-up structure is constrained by back-thrust from the north and fore-thrust from the south, on the dip lines. These maps depicted potential reservoir, demarcate promising site for future hydrocarbon exploration.

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Investigation of reservoir characteristics, depositional setting and T–R sequences of the Lockhart Limestone of Meyal Oil Field, Pakistan: a petrophysical approach

Awais

Ullah

Khan

et al. 2019

J Petrol Explor Prod Technol

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The present study is focused on formation evaluation of the Lockhart Limestone in two wells (Meyal-05P and Meyal-10P) located in Northern Deformed Potwar Zone of the Potwar sub-basin, Pakistan. The geological formations ranging from Triassic to Pliocene have been drilled in these wells. The formation evaluation of the Lockhart Limestone mainly involves reservoir potential evaluation, interpretation of depositional environment and transgressive-regressive sequences using petrophysical logs. In either wells, the reservoir characterization is steered by various petrophysical parameters including calculation of volume of shale, porosity, permeability and hydrocarbon saturation. The thickness of the Lockhart Limestone is 50 m and 77 m in the Meyal-05P and Meyal-10P wells, respectively. In Meyal-05P and Meyal-10P wells, the average petrophysical parameters values and ranges are given as follows: volume of shale 48% and 20%; density porosity 1-5.6% and 1-31.7%; neutron porosity 1-23% and 1-42.9%; sonic porosity 1-29% and 1-39%; effective porosity < 1-> 5% and 1-21%; and hydrocarbon saturation 92.21-99.8% and 97-99.6%. The petrophysical parameters indicate that the Lockhart Limestone of Meyal-10P well is quantitatively better reservoir than that of the Meyal-05P. In Lockhart Limestone of either wells, the permeability is < 0.1 mD. The bulk volume water deciphered the presence of vuggy and intercrystalline porosity in the Lockhart Limestone. Similarly, the lithological interpretation using logs shows mainly limestone with minor shales. Different electrofacies are interpreted from the log trends of gamma ray log such as aggrading, prograding and retrograding depositional sequences deposited in tidal channel fill, shallow water, shore line and offshore buildup and regressive-totransgressive shore face depositional setting.

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Petroleum play analysis of the Jurassic sequence, Meyal-field, Potwar basin, Pakistan

Cited by 5 publications

References 3 publications

An Integrated Seismic Interpretation and Rock Physics Attribute Analysis for Pore Fluid Discrimination

An Integrated Seismic Interpretation and Rock Physics Attribute Analysis for Pore Fluid Discrimination

2D Seismic Interpretation of the Meyal Area, Northern Potwar Deform Zone, Potwar Basin, Pakistan

Investigation of reservoir characteristics, depositional setting and T–R sequences of the Lockhart Limestone of Meyal Oil Field, Pakistan: a petrophysical approach

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