2D SEISMIC REFLECTION DATA INTERPRETATION, PETROPHYSICAL ANALYSIS AND MODEL BASED INVERSION OF MIANO AREA, LOWER INDUS BASIN, PAKISTAN

Abstract

Miano gas field is one of the prominent gas-producing fields of the Middle Indus Basin, SW Pakistan. In this dissertation, focus is placed on the structural interpretation of the Miano block-20 in order to demarcate the probable zone for the accumulation of hydrocarbons. This study attempts in preparation of synthetic seismogram of Miano-09 well. Analysis of geophysical borehole logs provides one of the best approaches to characterize rocks within boreholes. A model based post stacked inversion is applied with 2-D seismic data for quantitative interpretation of reservoir. For the interpretation of the seismic lines, three reflectors are marked by correlating synthetic seismogram on seismic section. As the area of study lies in the Lower Indus Basin, horst and graben geometry in this region is common which is confirmed by fault polygon and time and depth contours maps. Petrophysics is the one of the most reliable tools for the confirmation of the types of the hydrocarbon and for marking the proper zone of the interest for the presence of the hydro carbon by combination of the different logs results. In this dissertation the petrophysics is performed on the Miano-09 well and a zone of interest is marked where the average shale volume is 24%, effective porosity is 8% and potential of hydrocarbon is 62%. The result from model based inversion show us the low acoustic impedance of (33509(m/s)*(g/cc)) and porosity map depict the high porosity of 6 to 7.5% throughout the layer of zone of interest