2D SEISMIC INTERPRETATION, SEISMIC ATTRIBUTE ANALYSIS, PETROPHYSICAL ANALYSIS, FACIES ANALYSIS, AND COLOURED INVERSION OF SABZAL FIELD, DRANDI AREA, CENTRAL INDUS BASIN, PAKISTAN.

Abstract

Two dimensional seismic interpretation has been carried out in Dhandi area (study area) located near Rahim Vanr Khan in the district of Punjab province, Pakistan to reveal the subsurface geology. The data used for Ihis study was provided by DGPC. Seismic data given for well Sabzal-Ol includes navigation of well and segy data whereas well data include well tops find well headers. The horizons are identified and named on the basis of well and generalized stratigraphic data. Sabzal-Ol lies in Ccnt'rallndus Basin. The objective of research is to delineate structures on seismic lines, moking time-depth maps and to dclennine the hydrocarbon potential of Sabzal-OJ with the help of petrophyiscal techniques using wifeline logs, attributes analysis and coloured inversion. In attribute analysis, relative Acoustic Impedencc attribute, Average Energy attribute and wavelet Dominant Frequency Illlribute confinns Ihal the renectors are nearly horizontal, Ilnd also show high acoustic impedence and frequency in reservoir fonnation. Different petrophysical parameter, like volume of shale, water saturation, porosity and hydrocarbon saturation are taken into consideration for reservoir characterization. The value of volume of Shale in I-Iabib Rahi is 55%, effcclive porosity is 6%, Water Saturation is 81% and Hydrocarbon Saturation is 19% in Sabzal well which is dry well. Facies analysis indicate two facies in Habib Rahi Formation, limestone facie and shaly limestone facic. Coloured inversion is pcrfonned on a control line, indicale.o; that renectors are nearly horizontal and justifies thnt Sabzal-O I is dry well, as the reservoir formation is marked on the high acouslic irnpedence values.