Relationships between shale content and grain-size parameters in the Safaniya
Sandstone reservoir, NE Saudi Arabia
By:Saner, S (Saner, S); Cagatay, MN (Cagatay, MN); AlSanounah, AM (AlSanounah, AM)
JOURNAL OF PETROLEUM GEOLOGY
Volume: 19
Issue: 3
Pages: 305-320
DOI: 10.1111/j.1747-5457.1996.tb00436.x
Published: JUL 1996
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Abstract
The grain-size distribution of a sediment is controlled by the hydrodynamics of the
depositional environment. There is a relationship between the petrophysical properties of
a reservoir rock, such as porosity and permeability, and the grain-sie distribution.
Therefore, the grain-size distribution is important in interpreting both the depositional
environment and the petrophysical properties of a sedimentary rock. Determination of the
grain-size parameters from gamma-ray and/or other shale-indicator well logs may be
possible if the necessary correlations are established.
Relationships between the shale content and the grain-size parameters of samples from the
Lower Cretaceous Safaniya Sandstone Member in NE Saudi Arabia were investigated by
grain-size analyses of 47 samples using sieving and a Microscan II particle-size analyzer.
Analysed samples were ''clean'' and ''shaly'' fine- to very fine-grained sandstones. Grainsize distribution curves revealed a finer mean, poorer sorting,finer skewness, and a
leptokurtic distribution with increasing shale content. The shale content associated with
the finer grain sizes promoted a reduction in porosity and permeability, which is a common
occurrence in sandstones.
In the studied well, a reasonable correlation between the grain-size parameters and the
shaliness log was observed Vertical variations in the parameters for the sequence indicated
two coarsening-upwards and one fining-upwards depositional cycles.
Keywords
Author Information
Reprint Address: Saner, S (reprint author)
KING FAHD UNIV PETR & MINERALS,RES INST,DHAHRAN,SAUDI ARABIA.
Organization-Enhanced Name(s)
King Fahd University of Petroleum & Minerals
Addresses:
[ 1 ] UNIV ISTANBUL,INST MARINE SCI & MANAGEMENT,ISTANBUL,TURKEY
Organization-Enhanced Name(s)
Istanbul University
Document Information
Document Type:Article
Language:English
Accession Number: WOS:A1996UY95100004
ISSN: 0141-6421