Integrated Reservoir Characterization and Petrophysical Analysis of Cretaceous Sands in Lower Indus Basin, Pakistan
Authors
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Institute of Geology, University of the Punjab 54590 Lahore
Perveiz Khalid -
Institute of Geology, University of the Punjab 54590 Lahore
Muhammad Irfan Ehsan
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Institute of Geology, University of the Punjab 54590 Lahore
Sohail Akram
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Institute of Geology, University of the Punjab 54590 Lahore
Zia Ud Din
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Institute of Geology, University of the Punjab 54590 Lahore
Shahid Ghazi
DOI:
https://doi.org/10.1007/s12594-018-1042-3Abstract
The reservoir character of the Cretaceous sand is evaluated in Lower Indus Basin, Pakistan where water flooding is very common. Thus, prediction of subsurface structure, lithology and reservoir characterization is fundamental for a successful oil or gas discovery. Seismic reflective response is an important tool to detect sub-surface structure. Seismic reflection response is not enough to highlight geological boundaries and fluids in the pore space therefore, the use of integrated approach is vital to map sub-surface heterogeneities with high level of confidence. Based on seismic character and continuity of prominent reflectors four seismic horizons are marked on the seismic sections. All the strata is highly disturbed and distorted with presence of a network of fault bounded horst and graben structures, which indicate that the area was under compressional tectonic regime. These fault bounded geological structure formed structural traps favorable for the accumulation of hydrocarbon. The petrophysical analysis reveals that the Cretaceous sand formation has four types of sand: Sand A, B, C and D with good porosity (15 % average) and low volume of shale. Although complete petroleum system is present with structural traps and reservoir character of sand interval is very good but these sands are highly saturated with water thus are water flooded, which is the main reason of the abundant wells in the study area.
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