Acta Geodynamica et Geomaterialia

Title: EFFECT OF RESERVOIR HETEROGENEITIES ON ELASTIC AND SEISMIC PROPERTIES OF LOWER CRETACEOUS SAND INTERVALS, LOWER INDUS BASIN OF PAKISTAN
Authors: Khalid Perveiz, Arshad Muhammad, Ehsan Muhammad Irfan, Ahmad Aziz and Khurrum Shehzad
DOI: 10.13168/AGG.2021.0032
Journal: Acta Geodynamica et Geomaterialia, Vol. 18, No. 4 (204), Prague 2021
Full Text: PDF file (3.4 MB)
Keywords: Petrophysical analysis, rock physics analysis, Lower Indus Basin, reservoir heterogeneities
Abstract: The use of rock physics modeling and petrophysical analysis has become an integral part of quantitative seismic interpretation. In the present study, the above-mentioned techniques are applied to the reservoir interval of Basal Sand of Cretaceous age widely distributed in the Lower Indus Basin of Pakistan. The data used for this purpose consists of complete suits of wireline logs from four well A, B, C and D. The primary goal of this work is to understand the trends of seismic parameters such as P-wave velocity (VP), S-wave velocity (VS), bulk modulus, bulk density as a function of ﬂuid saturation and porosity in this sand interval. Petrophysical analysis based on well logs is used to obtain petrophysical properties such as porosity, the volume of shale, fluid saturation, P-wave velocity (VP), S-wave velocity (VS) and density at reservoir conditions. The results show that seismic parameters are very sensitive to fluid saturation, fluid types and rock-forming sediments. Reservoir porosity and fluid saturation control the elastic response of Basal Sand due to which seismic velocities decrease with an increase in porosity and fluid saturation.