SUST Journal of Engineering and Computer Sciences (JECS), Vol. 17, No.3, 2016 Estimation of Petro Physical Properties in Bentiu Formation, Rakuba Sub Basin, Sudan Abbas M. Yagoub, Hafiza Babiker College of Petroleum Engineering Technology, Sudan University of Science and Technology (SUST) Received: 13/06/2015 Accepted: 19/10/2015 ABSTRACT - This paper focuses on estimating the petro physical characteristics as porosity, permeability and water saturation of Bantui formation. The formation is considered to be a reservoir rock in Rakuba depositional sub-basin. The properties have been estimated by analyzing and interpreting open hole logs of three wells. The raw log data were processed using Interactive Petro physics software version 3.5(IP v 3.5). Density-neutron cross plot logs was interpreted in order to estimate shale volume and porosity. The resistivity logs were corrected so that water saturation can be calculated with reasonable accuracy. Water saturation has been estimated using Archie's equation and the permeability has been calculated using Timur’s equation. As a result of applying this methodology, Bentiu’s formation porosity was found to be a good porosityas far as permeability are concerned, average porosity in Bentiu's formation 20%, permeability ranges from 0 to264 m.D, and water saturation value 100%.as final point Bentiu can be considered as a good reservoir but regrettably it is full of water. Keywords: Petrophysics, Lithology, porosity, Rakuba sub basin. مستخلص ال- لفيزيائية ل تحديد الخواص اة فيعلميذه الورقة ال تركز ه بانتيو متكونلنفاذيةمية ،المسا مثل ا, لماء تشبع ا. يمكن عتبار ا المتكون صخور اكوبة الرسوبي الفرعي ترسيب حوض ر مكمن في. فسير بياناتيل وتخواص عن طريق تحل تم تقييم ال سجيلت تلبار الث لث آبار بستخدام ا برنامجInteractive Petro physics version 3.5 لخامت البيانايل ا في تحل. تم تفسير الرس ملمساميةطفل واب كمية اليترون لتحديد وحسافة والنلكثالي ا تسجيلمتقاطع بين ا. تسجيل اءاتيح قر تم تصح بالماء بدقة عالية التشبعلمقاومة لتمكن من حساب ا. معادلستخداملتشبع باب ا تم حسا ة ارشي. كفاذية منب النا تم حسا م معادلة ت م ي ر. بتطبيقلنفاذية جيدة بنفس القدر ا مسامية عليحتوي بانتيو يذه الطرق،وجد ان متكون ه. قيمةمية المتوسطةلمسا ا بانتيو لمتكون02 % و بانتيوفاذية متكون ن اوح بي تتر ن صفر الي062 لتشبع بالماء ، و قيمة ا ملي دارسي022 .% في الخير لحظ مشبع تماما بالماءتيو مكمن جيد لكن لسوء ا بان عتبار متكون يمكن ا. INTRODUCTION Studying physical rock prosperities (petrophysics) plays main role in oil industry around the world, which distinct reservoir formation from other formations, then determine is the rock has storage capacity or hasn’t, moreover, fluid types are defined and their percentages. In this stage initial oil in place is easily estimated. So then formation Producibility must be known. Although well logging consider the first technique in determining petrophysics, according which well logging data are gathered, analyzed, and interpretated. As a result of the technique values of porosity, water saturation, and permeability are well estimated. Then reservoir can be described clearly. Many technical papers ware published, which are focusing into petrophysics study, as example: They had estimated reservoir properties in Oshioka field based on data from two wells using geophysical well logs, the results carried out with petrel and hydrocarbon data system [5] . The results correlated with mud log and geology information and found that porosity and permeability values form hydrocarbon bearing reservoir are good enough for commercial accumulation in the Niger delta. 25