2D SEISMIC INTERPRETATION AND PETROPHYSICAL ANALYSIS OF KABIRWALA AREA, CENTRAL INDUS BASIN, PAKISTAN

Abstract

Kabir wala area is prominent in the central Indus basin for its hydrocarbon (oil and gas) structural traps. The present study pertains to integrated seismic interpretation with seismic inversion and Petrophysical analysis. The key objective of this project is to delineate the subsurface geometry with the help of different seismic techniques in order to understand the petroleum system of the concerned area. Main emphasize is on the interpretation methodology adopted in order to illustrate the horizons and faults. The data used for this study consist of four seismic lines along with their navigation and well data of one well. Three horizons were marked with the help of a synthetic seismogram to delineate the structure of the study area. Samana Suk formation was marked the main reservoir in this area. Petrophysical analysis was performed on the Nandpur-2 well, which is located near our research area. The quantitative interpretation is based on the combined response of all the logs. In the Nandpur-2 well, a zone of interest was identified as having good probable reserves, effective porosities, and hydrocarbon saturation. To pursue qualitative interpretation, Model-based inversion is used. The information of the subsurface layer is obtained by model-based inversion in the form of acoustic impedances. In the final inverted sections, low impedances indicate promising hydrocarbon-bearing zones. The presence of source and cap rock in the zone was also established using model-based inversion. All the parameters have been integrated through seismic inversion which also show decrease in acoustic impedance along the Samana Suk limestone Formation. Results also reveal that producing wells lies in the low impedance and high porosity Zones. On the basis of this analysis some sweet spots were also marked which seems to be favorable for hydrocarbon accumulation.