WELL LOG STUDY AND PETROPHYSICAL PROPERTIES OF THE EARLY PERMIAN WARCHHA SANDSTONE, POTWAR BASIN, PAKISTAN

Abstract

The Chak Naurang Well1-A, drilled by Oil and Gas development company limited (OGDCL) in the eastern Potwar Basin, encountered thickness of 82 m for the Early Permian Warchha Sandstone. The sedimentological and reservoir aspects of the Warchha Sandstone from the response of various wireline logs have been investigated. This study is focused on the response of log signatures against the sediments within the Warchha Sandstone reveals an overview of depositional setting.
Large-scale subsurface facies architecture based on the gamma-ray log including, channel fill deposits, point bar and flood plain have been identified. They show a characteristic vertical stacking pattern on the logs. The depth interval from 2357m to 2439m has been investigated for the petrophysical properties by examining the response of the various wireline logs recorded at 1m interval. The result of this study suggests that the Warchha Sandstone possess considerable storage capacity for holding moveable hydrocarbon.