Low Resistivity Pay Zones and Their Resolution Using (IP), Hadida Case Study

Abstract

This research presents an overview of petrophysical research and exploration achievements of low resistivity pay (LRP) zone in Hadida oil field in Block VI is located in the southwest of Sudan, in the northwest of the Muglad basin, and covers an area of 59,000 sq. km. Hadida Field is located in the northwest of Block 6, between Nugara and Sufyan field. It includes geological characteristics and characteristics of well log response of the low resistivity pay zones, as well as the problems in recognizing and evaluating low resistivity pay zones by well logs. The main methodology which stablished in this research to identify the LRP zone is to use the Software Interactive petrophysics (IP) to identify the pay zone (Well Log) in general and then make a well correlation between geological column data (Masterlog) and well log. According to the planetology studies in core, one can classified two Low resistivity pay zones in Hadida, the first interval is Bentiu Formation which classified as Aptian-Cenomanian age. The second interval is Abu Gabra Formation which classified as Neocomian age. Clay minerals distribution are the primary cause of the low resistivity in Bentiu sand and it formed during and after deposition. They are distributed in the formation as laminar shale. Shale volume ,fine grain and High invasion are the primary cause of the low resistivity in Abu Gabra zone. The petrophysical research concerning recognition and evaluation of the low resistivity pays, based on their genetic types.