Evaluation of Reservoir Properties and Fracture Estimation Using Petrophysical Logs in a Southwestern Iranian Hydrocarbon Field

The Sefid-Zakhur Anticline is Located in the Fars Region, 160 Km South-East of Shiraz and South of the Aghar Gas Field, in the West of the Dalan and the Gas Field of Day. In General, Fractures of Hydrocarbon Reservoirs Have a Many Complexions which can Play an Important Role in all Stages of the Reservoir such as Exploration, Development and Expansion, So the First Step is to Study Fractures Especially Reservoirs Failure Identification of Fractures, their Estimation and Analysis. Exploring, Evaluating and Researching Hydrocarbon Fields Requires a Large Amount of Information from Wells, Which Is Usually Not Due to Cost and Problems. In this Research, Firstly, according to Raw Data Obtained from Drilling and with the Help of Commercial Software, Petrophysical Parameters of Sefid-Zakhur Formation as Type of Lithology, Porosity, Shale Volume and Water Saturation, using Evaluate a Probabilistic Method. Based on the Results of Cross-Plot Neutron-Density and M-N Plot, Lithology is Dominated by Carbonate Formation and a Small Percentage of Sandstone and Shale. The Average Water Saturation in the Studied well is 36%. Also, due to the Low volume of Shale 15%, the Average and Total Porosity is Equal in Most of the Wells. To Determine Electro-Facies in the Studied Field of the Method Multi-Resolution Graph-Based Clustering (MRGC) use and Determine 6 Electro-Facies of that Number Facies 2 Due to the Low Volume of Shale, It Has the Best Reservoir Quality and Facies Number 4 Have a Poor Reservoir Quality Due the High Volume of Shale. Method used in this Research a Convenient Method to Analyze the Reservoir Zones and Especially it can be used in Wells Lacking Cores. In the Next Step, The Method is Referred to for Fracture Zones was Determined using the Petrophysical Logs.