2-D SEISMIC MODELLING AND RESERVOIR CHARACTERIZATION USING WELL DATA OF SINJHORO BLOCK, LOWER INDUS BASIN PAKISTAN

Abstract

In this dissertation, focus is placed on the structural interpretation of the Chak 66-01 well in order to demarcate the probable zone for the accumulation of hydrocarbons. The work is carried out on 3 seismic lines along with petro physical logs of chak 66-01, using Kingdom 8.8 software. The integrated study involves; structural interpretation of seismic data, time to depth conversion, synthetic seismogram and colored inversion. The area of study lies in the southern Indus basin, horizons of Massive sands, Basal Sands and Lower Goru are confirmed by synthetic seismogram. Horst and graben geometry bounded by normal faults is common in this region which is confirmed by fault polygon and time and depth contours made from time and depth grid respectively. Petro-physical interpretation of well Chak66-01 leads to probable zone for hydrocarbon extraction in Lower Goru Sands. Porosity of thick reservoir (Massive Sands of Cretaceous) is 13%. For the interpretation of the seismic lines, four reflectors are marked by correlating synthetic seismogram on seismic section. The horizons were identified using formation tops from wells and their depth were confirmed through correlation with synthetic seismogram generated from sonic and bulk density logs. Time, depth and horizon contour maps of the horizons of interest have been generated to understand the spatial geometry of the structures. Petro physics is the one of the most reliable tools for the confirmation of the types of the hydrocarbon and for marking of the proper zone of the interest of the presence of the hydro carbon by combination of the different logs results. In this dissertation the petro physics is performed on the Chak 66-01 well and different zone of interest are marked where there is chance of the presence of the hydro carbon. At last the colored Inversion is performed in order to identify the Acoustic impedance and porosity in the study area.