ASSESEMENT OF RESERVOIR QUALITY ON THE BASIS OF PETROPHYSICAL AND GEOMECHANICAL PROPERTIES FOR KADANWARI-1, 10 AND 11, CENTRAL INDUS BASIN, PAKISTAN

Abstract

The main objective of the study is reservoir characterization using Petrophysical and Geomechanical Facies of selected wells from Kadanwari field. Kadanwari Field was discovered in 1989 and was brought to stream in 1995. The field is located on the southeastern flank of Jacobabad High. 40 wells have been drilled in this gas producing field. Sembar and Lower Goru Shales are presumed source of most of the gas fields in MIB. Digital data in LAS format of wireline open hole logs was used for the study. The evaluation was performed in Kadanwari-1, Kadanwari-10 and Kadanwari-11. Initial well correlation technique was used to identify four Zones of Interest. Petrophysical evaluation and Geomechanical properties computation was performed for these zones. The zones were further categorized in pay zones and non-pay zones. IPSOM was used to perform Facies Analysis, which used Petrophysical and Geomechanical outputs to classify them into four Facies. These facies are ranked from 1 to 4 depending on the quality of the reservoir with 4 being the best and 1 being the worst. Reservoir characterization and classifying it in facies helps getting better flow units and helps during development of the field and workovers. The presence of distinct units with certain Petrophysical and Geomechanical properties help geoscientists establish a strong reservoir characterization. On the basis of Petrophysical Analysis, Zone-2 is the best zone of interest with the cumulative Net thickness of 27.62m in studied wells. Facies-4 is showing maximum thickness in Zone-2 in Kadanwari-10 and Kadanwari-11 whereas in Kadanwari-1, Facie- 4 is showing maximum thickness in Zone-4. The combination of Net Pays and Facies Analysis concludes Zone-2 being the best Zone in the wells.