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Article Type

Research Paper

Highlights

  • Prediction of future reservoir production.
  • Detection of the accurate estimation of water saturation.
  • Estimating types of shale and its volumes.
  • Determining the relation between permeability and types of shale.

Abstract

This study depends on the analysis of well logging data for Raha Formation, utilizing eight wells scattered in the Ras Budran Oil Field. It is situated in the northern region of the Gulf of Suez's Belayim Offshore Oil Field and far away 4 km from the Sinai coast. Water saturation is one of the steps through which the characterization of the reservoir and prediction of future accumulation are determined. Many parameters such as types of shale, volumes of each type, and petrophysical exponents are necessary to detect the accurate estimation of water saturation. First, Dia-Porosity cross plots are used to estimate three types of shale and their volumes (dispersed, laminated, and structural), from these plots it was found that the dispersed shale exhibits the highest percentage in the middle of the study area, while the laminated shale volume increases toward the north directions but the structural shales give the maximum value in the trend of the north-west. The presence of scattered shale in a formation is known to have a negative impact on the permeability of the rock, unlike the laminated shale decreases the total average of effective porosity. Comparable to laminated shale, structural shale has nearly identical characteristics. Secondly, the petrophysical exponents (cementation factor (m), saturation exponent (n), and tortuosity factor (a) were ascertained using Pickett's plot. It gave the values of "m" ranging from 1.8 to 2.3 and values of "a" varying from 0.72 to 1 in the studied wells, where these petrophysical exponents play a vital role for calculating the water saturation (Sw) in both clean and shaly rocks. This study aimed to determine the different types of shale and calculate the petrophysical exponents which are important for a good estimation of the water saturation in rocks (clean and/or shaly) and for determining hydrocarbon saturation (Sh).

Keywords

Petrophysical Exponents, petrophysical parameters, Ras Budran Oil Field, shale types, and Pickett's plots

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