International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 2319-183X, (Print) 2319-1821 Volume 2, Issue 11 (November 2013), PP.19-29 www.irjes.com 19 | Page Analysis of Zero Offset Vertical Seismic Profiling Data Processing To Evaluate the Oil and Gas Reservoir in Well “X”, Murzuk Basin, Soutwest Libya Abdel Razak Saad Mohamed 1 , Adi Susilo 2 , Sukir Maryanto 2 1,2,2 (Geophysics, Faculty of sciences, Brawijaya University, Malang, East Java, Indonesia) Abstract:- The Murzuq Basin, SW Libya, is one of the high potential area of oil and gas on the North African Saharan Platform. The Mamuniyat Formation in Well ―X‖ of Murzuq Basin is the primary reservoir target in our study. The present study in Well ―X‖ is base on well log data and Zero Offset Vertical Seismic Profiling (ZVSP). This research focuses in ZVSP data processing. The processing of ZVSP includes wavefield separation and corridor stacking. The wavefield separation is done by using a frequency-wave number (F-K filter) and Median filters which intended to isolate the ZVSP data into the upgoing and the downgoing wavefields. Meanwhile, the well logs of interest are: Gamma Ray Log, Acoustic Log, Bulk Density Log, P-wave Velocity Log, and Caliper Log. Base on the ZVSP Data processing and correlation with well log analysis shows that the sandstone at Mamuniyat formation in Well ―X‖, Murzuq Basin, Soutwest Libya contains significant accumulation of oil and gas. At the top of the Mamuniyat formation there is some crossover between the Gamma Ray, density, P-wave velocity, and Acoustic Impedance, possibly indicating the presence of gas. This crossover is very thin (~ 52 ft). This well also show a much thicker (~148 ft) at the top of the Lower Mamuniyat formation until buttom of Melez Shuqran formation, possibly indicating the saturated with gas, oil, and water. In addition, base on analysis of reservoir connectivity in Mamuniyat formation the sandstone reservoir in Upper, Middle and lower Mamuniyat, and even Melez Shuqran are becoming thicker from SE to NW. Keywords:- Zero Offset Vertical Seismic Profiling, Mamuniyat Formation, Murzuq Basin, Libya. I. INTRODUCTION The Murzuq Basin is located in southwestern Libya (Figure. 1). The acquisition of the Zero Offset Vertical Seismic Profiling (ZVSP) and borehole data was done in Well ―X‖ in Murzuq Basin during the summer 2010 with the purpose to evaluate the oil and gas reservoir at the Mamuniyat Formation. The Murzuq Basin also called the Djado Basin in SW Libya is sub-circular in shape and clearly visible on satellite images. The Murzuq Basin, covers an area of some 350.000 km 2 , extending southwards into Niger [1]. In Figure 1, early Palaeozoic tectonism created a series of NNW trending arches and sub-basins across North Africa, filled with siliciclastic continental and shallow-marine deposits. This Early Palaeozoic tectonism effectively controlled the distribution of Upper Ordovician hydrocarbon reservoirs and the distribution of Silurian"Hot Shale" source and seal rocks which onlap early-formed fault blocks in Murzuq Basin [2, 3]. Figure 1 Location Map of study area in Libya. White circle denoted the location of well ―X‖ in Southwestern Libya .