Petrophysical and Well Log Evaluation of Dry Holes in Fort Abbas area,Punjab Platform, Pakistan.

Abstract

Present study is carried out in Punjab Platform, Central Indus Basin. It pertains topetrophysical analysisof well log data of Fort Abbas-01, Bahawalpur East-01 and Marot-01. Well Fort Abbas-01 had target depth of 1650 and hydrocarbon potentials were tested for Kussak and Khewra formations (Cambrian) and Salt Range formation (Pre-Cambrian). The well was declared dry and plugged abandoned. Petrophysical studies include Crossplot generation between log data of Neutron Porosity and Bulk Density. In three wells Neutron PorosityDensity Cross-plots show linear trenddata values matching withlimestone and dolomite lithology. It also includes calculation of porosity, volume of shale and proportion of water content in the Khewra Sandstone. Content of volume of shale varies from 5-25%. Average porosity trend indicates good to excellent which is from 20-35% in all three wells. The results show that water saturation is from 50 – 90 % in all three wells which exceeds the general value suitable for hydrocarbon accumulation. Well correlation shows presence of thick Salt Range and Cambrian formations in wells Bahawalpur East-01 and Marot-01.Permian is pinching out in Fort Abbas-01. Thinning of Paleocene and Mesozoic formations towards Marot-01 is also evident. All the strata isdeepening towards north in well Bahawalpur East-01.