Identification of clay mineral compounds in the Southern Iraqi upper Nahr Umar Formation using SGR logging

   Typically, sandstone oil reserves comprise various clay minerals, such as illite, chlorite, and kaolinite. The existence of these clay minerals drastically affected the quality of these reservoirs. This paper attempts to detect clay minerals and environmental deposition of the upper shaly-sand un...

Full description

Saved in:
Bibliographic Details
Published in:Iraqi Journal of Chemical and Petroleum Engineering (Online) 2024-12, Vol.25 (4), p.139-145
Main Authors: Kadhim, Mahdi M., Abdul Hussein, Hassan A., Dheyauldeen, Atheer
Format: Article
Language:English
Subjects:
SGR
clay minerals
sedimentary conditions
Nahr Umar formation
organic materials
shaly-sand formation
Kaolinite
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:   Typically, sandstone oil reserves comprise various clay minerals, such as illite, chlorite, and kaolinite. The existence of these clay minerals drastically affected the quality of these reservoirs. This paper attempts to detect clay minerals and environmental deposition of the upper shaly-sand unit (USSU) of the Nahr Umar formation, as it is the main reservoir. It is a portion of an anticline composed of a lower Cretaceous clastic sandstone formation. The kind of environment, clay minerals, and depositional correlation between total organic matter and uranium content were determined using a spectral log of gamma-ray (SGR). According to the SGR log, the primary constituents of USSU are mixed-layer clays, which are illite, kaolinite, and chlorite. The investigated wells in the field's western north have Th/U (thorium/ uranium) ratios ranging from 0.465 to 18.4. Based on the Th/U ratio, the USSU had a mostly shallow marine with continental and marine environment traces. Additionally, a Th/K (thorium /potassium) cross-plot revealed that as kaolinite decreased, illite increased in the formation's southern region.
ISSN:1997-4884
2618-0707
DOI:10.31699/IJCPE.2024.4.13