Reservoir potential, net pay zone and 3D modeling of Cretaceous Pab Formation in Eastern Suleiman Range, Pakistan

Iranian Journal of Earth Sciences

مقاله 2، دوره 13، شماره 3، مهر 2021، صفحه 173-180   

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.30495/ijes.2021.682864

نویسندگان

Hadayat Ullah^{* 1، 2}؛ Perveiz Khalid¹؛ Mubashir Mehmood^{3، 4}؛ Saad Ahmed Mashwani¹؛ Zaheer Abbasi^{1، 5}؛ Muhammad Jehangir Khan¹؛ Ehsan Ul Haq¹؛ Ghulam Mujtaba Shah¹

¹Department of Earth & Environmental Sciences, Hazara University Mansehra KPK, Pakistan

²Institute of Geology, University of the Punjab, Lahore, Pakistan

³Department of Geology, Abdul Wali Khan University Mardan KPK, Pakistan

⁴Department of Earth Sciences, Quaid -e- Azam University Islamabad, Paksitan

⁵National Academy of Higher Education (NAHE) Islamabad 44000, Pakistan

چکیده

       The Eastern Suleiman Fold and Thrust Belt comprises of a thick cover of sedimentary sequences. Despite of presence of complete petroleum system source, reservoir and seal rocks less attention was paid by the exploration and production companies to prospect. An integrated approach is adopted to delineate reservoir potential and net pay zones in the clastic reservoirs of the Cretaceous age widely distributed in the area. Wireline logs and migrated seismic reflection data were used for field development and optimization. Petrophysical analysis reveals that Pab Sandstone of the Cretaceous age is acting as a reservoir rock, whereas the Ghazij Shales of the Eocene age are acting as a regional seal rock. A complete workflow is proposed for formation evaluation, and structural interpretation of the subsurface geology. Based on wireline logs it is interpreted that the thickness of the Pab Sandstone varies from 250 m to 350 m in the entire study area. The sandstone is massive with high porosity and intercalated layers of shales. Faulted anticlinal structures are present in the study area which are favorable for the accumulation of hydrocarbon. 3D structural models and various seismic attribute models were prepared to analyze the reservoir character of this clastic reservoir. Based on wireline logs and seismic data clean sand, shaly sand and shale are marked as dominant facies in the study area. However, clean sand facies are more favorable to act as potential net pay zone.

کلیدواژه‌ها

Cretaceous؛ Pab sandstone؛ Petrophysics؛ 3D structural modeling؛ Anticlinal structures

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