Comparative Study of Pore Pressure in Wells of Indus Offshore, Southwest Pakistan

Khan, Natasha

doi:10.1007/s13369-017-2867-6

Cited by 2 publications

(6 citation statements)

References 16 publications

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“…The seismic reflection profiles near Jal Pari-1A reveal mud diapirism whereas, in the west, it is less observed. Overpressures in the east of Jal Pari-1A, in Indus Marine wells (Indus Marine-1A and Indus Marine-1C) have been previously reported by Khan (2018). According to Khan (2018), the overpressure or high-pressure development in the Indus Marine wells is likely attributable to the high sedimentation rate and disequilibrium compaction during the Neogene (Miocene Epoch).…”

Section: Formation Pressure Evaluationmentioning

confidence: 73%

“…The high-pressure development in this area may likely be attributable to the mud diapirism associated with stratigraphic strata, as shown in Figures 8-11. Overpressure to the east of Jal Pari-1A, in Indus Marine wells, has been reported by Khan (2018). According to Khan (2018), the overpressure or high-pressure development in the Indus Marine wells is likely caused by the high sedimentation rate and disequilibrium compaction during the Miocene Epoch.…”

Section: Discussionmentioning

confidence: 99%

“…Likewise, in Pasni-X2, a maximum well deviation of 19.9° was reported at 2902 m while 21° occurred at around 4000 m. In Gawadar-01, drilled to the west of the aforementioned wells, a maximum well deviation of 4.9° occurred at 3810 m (Table 1). The fluid type used is KCL Polymer in wells drilled in Makran, in contrast to Offshore Indus, where sea gel was used as a drilling fluid (Khan, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The presence of sediments under highpressured, however, results in drilling and other technical complications. The high-pressure development to the east of Makran (Indus Offshore Basin) has likely contributed to exploration and drilling difficulties (Khan, 2018).…”

Section: Regional Tectonics and Stratigraphymentioning

confidence: 99%

“…For pressure estimation, a modified version of Eaton's resistivity model for deep waters was applied. The overburden gradient, overburden pressure, fracture pressure gradient were calculated using the pressure equations from Khan (2018). Table 2 shows the various parameters used in pressure analysis and calculations.…”

Section: Water Saturation (Archie's Equation)mentioning

confidence: 99%

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Reservoir Potential Assessment of the Tortonian–Calabrian Sediments from Offshore Makran (Southwest Pakistan) through a Multidisciplinary Approach

Khan

ALI

KHURSHEED

et al. 2023

Acta Geologica Sinica (Eng)

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The Tortonian-Calabrian strata of Offshore Makran (Pakistan) is investigated for the purpose of reservoir assessment. The stratigraphy and petrophysics indicate that the Neogene sediments have tight reservoir potential with porosities in the range of 3%-9% and 40%-50% water saturation. The mineralogical cross plots indicate a mixed lithology with an abundance of dolomite and calcite, together with minor quartz content and shale. The seismic interpretation demonstrates medium-high amplitude reflection patterns, mud diapirs coupled with onlapping strata and the occurrence of bottom simulating reflectors (BSRs). The BSRs are characterized by diminished amplitude, low continuity and exhibiting acoustic blanking zones. The high formation pressure results indicate overpressure zones, suggesting the occurrence of overpressured shales in the Jal Pari-1A. The presence of mud diapirs and gas chimneys are the result of tectonic forces acting at the junction of the Arabian, Indian and Eurasian plates, whereas, BSRs prove the existence of gas charged sediments supporting the formation of mud diapirism in the region. It is concluded that the high rates of sedimentation during the Neogene are likely to have contributed to the development of the high formation pressure. Revised mud weights, casing policies, pore pressure transients and geophysical inversion studies will help alleviate drilling risks in future exploration strategies.

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Section: Formation Pressure Evaluationmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Regional Tectonics and Stratigraphymentioning

confidence: 99%

Section: Water Saturation (Archie's Equation)mentioning

confidence: 99%

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