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<div class="articledetails article-header clearfix">
<p class="art-type">Research Article</p>
<p class="art-title">Geometric relaxation time of induced polarization
fractal dimension for characterizing Shajara
Reservoirs of the Shajara formation of the PermoCarboniferous
Unayzah Group-Permo</p>
<p class="art-author"><?php $authors="Khalid Elyas Mohamed Elameen Alkhidir<sup>*</sup>"; echo (stristr($authors,$coauthor))?str_replace($coauthor,"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>",$authors):$authors; ?></p>
<p class="art-affl">
Department of Petroleum and Natural Gas Engineering, College of Engineering, King Saud University, Saudi Arabia
</p>
<p class="art-aff"><b>*Corresponding author: <?php $corresponding_author="Khalid Elyas Mohamed Elameen Alkhidir"; echo ($coauthor!="" && $coauthor==$corresponding_author)?"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>":$corresponding_author;?></b>, Department of Petroleum and Natural Gas
Engineering, College of Engineering, King Saud University, Saudi Arabia, E-mail: <a href="mailto:kalkhidir@ksu.edu.sa">kalkhidir@ksu.edu.sa</a>
</p>
<p class="art-aff"><b>Received:</b> November 6, 2017
<b>Accepted:</b> January 27, 2018
<b>Published:</b> February 2, 2018</p>
<p class="art-aff"><b>Citation: </b> AlKhidir KEME. Geometric relaxation
time of induced polarization fractal dimension
for Characterizing Shajara Reservoirs of the
Shajara Formation of the Permo-Carboniferous
Unayzah Group-permo. <i>Int J Petrochem Res.</i>
2018; 2(1): 105-108. doi: <a href="https://doi.org/10.18689/ijpr-1000119">10.18689/ijpr-1000119</a></p>
<p class="art-aff"><b>Copyright:</b> &copy; 2018 The Author(s). This work
is licensed under a Creative Commons
Attribution 4.0 International License, which
permits unrestricted use, distribution, and
reproduction in any medium, provided the
original work is properly cited. </p>
<p><a href="<?php echo $extpath;?><?php echo $jres['journal_link'];?>/ijpr-1000119.pdf" class="btn btn-danger pull-right" target="_blank">Download PDF</a></p>
</div>
<div class="articlecontent">
<p class="art-subhead">Abstract</p>
<p class="art-para">Sandstone samples were collected from the surface type section of the Shajara
Formation of the Permo-Carboniferous Unayzah Group for detailed reservoir
characterization. Capillary pressure experiment was performed to contact porosity and
permeability was derived from the Data. Geometric relaxation time of induced
polarization was calculated from the distribution of pores and the fractal dimension was
proven from the relationship between water saturation and geometric relaxation time of
induced polarization. In addition to field observation and obtained results of fractal
dimension, the Shajara reservoirs of the Shajara Formation of the permo-Carboniferous
Unayzah Group were divided here into three fractal dimension units. The Units from
base to top are: Lower Shajara Geometric Relaxation Time Fractal dimension Unit, Middle
Shajara Geometric Relaxation Time Fractal Dimension Unit, and Upper Shajara Geometric
Relaxation Time Fractal Dimension Unit. These units were also proved by arithmetic
relaxation time of induced polarization fractal dimension. It was found that the geometric
relaxation time fractal dimension is similar to the arithmetic relaxation time fractal
dimension of induced polarization. It was also reported that the obtained fractal
dimension speeds with increasing permeability and relaxation time due to an increase in
pore connectivity.</p>
<p class="art-para"><b>Keywords:</b> Shajara Formation; Unayzah group; geometric relaxation time fractal dimension; arithmetic relaxation time fractal dimension</p>
<p class="art-subhead">Introduction</p>
<p class="art-para">The phenomenon of electrical induced polarization (IP) in water-bearing sediments
was reported by <a href="#1">[1]</a>. Laboratory study of induced polarization in sandstone rocks with
varying salinity and shalyness was investigated by <a href="#2">[2]</a>. An increase of induced polarization
effect with increasing permeability, increasing porosity, and decreasing shalyness was
examined by <a href="#2">[2]</a>. An increase of permeability with increasing geometric and arithmetic
induced polarization relaxation time and increasing porosity was confirmed by <a href="#3">[3]</a>.</p>
<p class="art-para">A new integrated model with relaxation time spectra, porosity and formation factor
was proposed to predict permeability was recognized by <a href="#4">[4]</a>. Bimodal Pore Size
behavior of the Shajara Formation reservoirs of the permo-carboniferous Unayzah
group was investigated by <a href="#5">[5]</a>. Subdivision of the Shajara reservoirs into three units
based on thermodynamic fractal dimension approach and 3-D fractal geometry
model of mercury intrusion technique was reported by <a href="#6">[6]</a>. New Finding reported from King Saud University Describe advances in Geoscience
was reported by <a href="#7">[7]</a>. Subdivision of the Shajara reservoirs
into three units: Lower Shajara Differential Capacity Fractal
Dimension Unit, Middle Shajara Differential Capacity
Fractal Dimension Unit, Upper Shajara Differential Capacity
Fractal Dimension Unit was described by <a href="#8">[8]</a>. Pressure head
fractal dimension for characterizing Shajara Reservoirs of
the Shajara Formation of the Permo-Carboniferous
Unayzah Group, Saudi Arabia was studied by <a href="#9">[9]</a>.</p>
<p class="art-subhead">Method</p>
<p class="art-para">The geometric relaxation time of induced polarization can be
scaled as</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq1.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Where Sw the water saturation, IPTg the geometric relaxation
time of induced polarization, IPT gmax the maximum
geometric relaxation time of induced polarization, and Df the
fractal dimension.</p>
<p class="art-para">Equation 1 can be proofed from</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq2.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Where k the permeability in millidarcy, 9.6 constant, IPTg
geometric relaxation time of induced polarization in
milliseconds; F the porosity; and 1.57 constant.</p>
<p class="art-para">The maximum permeability can be scaled as</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq3.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Divide equation 2 by equation 3</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq4.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Equation 4 after simplification will become</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq5.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Take the square root of equation 5</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq6.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Equation 6 can also be written as</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq7.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Take the Logarithm of equation 7</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq8.PNG" class="img-responsive center-block"/></div>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq9.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Insert equation 9 into equation 8</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq10.PNG" class="img-responsive center-block"/></div>
<p class="art-para">If we remove the Log from equation 10</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq11.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Equation 11 the proof of equation 1 which relates the water
saturation, the geometric relaxation time of induced
polarization, the maximum geometric relaxation time of
induced polarization, and the fractal dimension</p>
<p class="art-para">The arithmetic relaxation time of induced polarization can be
scaled as</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq12.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Where Sw the water saturation, IPTa the induced polarization
relaxation time arithmetic, IPTa max the maximum induced
polarization relaxation time arithmetic, and Df the fractal
dimension.</p>
<p class="art-para">Equation 12 can be proofed from</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq13.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Where k the permeability in milldary,11.1 constant, IPTa the
induced polarization relaxation time in milliseconds, F the
porosity, and 1.74 constant.</p>
<p class="art-para">The maximum permeability can be scaled as</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq14.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Divide equation 13 by equation 14</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq15.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Equation 15 after simplification will become</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq16.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Take the square root of equation 16</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq17.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Equation 17 can also be written as</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq18.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Take the logarithm of equation 18</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq19.PNG" class="img-responsive center-block"/></div>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq20.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Insert equation 20 into equation 19</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq21.PNG" class="img-responsive center-block"/></div>
<p class="art-para">If we remove the Log from equation 21</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-eq22.PNG" class="img-responsive center-block"/></div>
<p class="art-para">Equation 22 the proof of equation 12 which relates the
water saturation Sw. the arithmetic relaxation time of induced
polarization IPTa, the maximum arithmetic relaxation time of
induced polarization IPTa max, and the fractal dimension Df.</p>
<p class="art-para">Porosity was measured on collected sandstone samples
from the surface type section of the Shajara formation of the
permo-carboniferous Unayzah Group. Permeability was
calculated from the measured capillary pressure date.The
objective of this paper is to calculate the geometric relaxation
time and arithmetic relaxation time of induced polarization
from the distribution of pores and to calculate the fractal
dimension from the relaxation time.</p><br>
<p class="art-subhead">Results and Discussion</p><br>
<p class="art-para">Based on field observation the Shajara Reservoirs of the
Shajara Formation of the Permo-Carboniferous Unayzah
Group were divided into three units as described in figure1. These units from base to top are: Lower Shajara Reservoir, Middle Shajara reservoir, and Upper Shajara Reservoir.</p>
<p class="art-para">Their acquired results of the geometric relaxation time
fractal dimension and arithmetic relaxation time fractal dimension
of induced polarization are displayed in table 1. Based on the
attained results it was found that the geometric relaxation time
fractal dimension is equal to the arithmetic relaxation time fractal
dimension. The maximum value of the fractal dimension was
found to be 2.7872 assigned to sample SJ13 from the Upper
Shajara Reservoir as verify in Table 1. Whereas the minimum
value of the fractal dimension was reported from sample SJ3
from the Lower Shajara reservoir as displayed in table1. The
geometric relaxation time induced polarization fractal dimension
and arithmetic relaxation time fractal dimension were observed
to increase with increasing permeability as proofed intable1
owing to the possibility of having interconnected channels.</p>
<p class="art-para">The Lower Shajara reservoir was denoted by four sandstone
samples out of six, label as SJ1, SJ2, SJ3 and SJ4 as confirmed in
figure1.Their geometric fractal dimension and arithmetic time
fractal dimension values are proofed in table 1. As we proceed
from sample SJ2 to SJ3 a pronounced reduction in permeability
due to compaction was reported from 1955 md to 56 md which
reflects decrease in geometric and arithmetic relaxation time
fractal dimension from 2.7748 to 2.4379 as specified in table 1. Again, an increase in grain size and permeability was recorded
from sample SJ4 whose geometric fractal dimension and arithmetic
fractal dimension was found to be 2.6843 as described in table 1. In contrast, the Middle Shajara reservoir which is separated
from the Lower Shajara reservoir by an unconformity surface
as shown in figure 1. Itwas designated by three samples out of
four, namely SJ7, SJ8, and SJ9 as illustrated in figure 1. Their
geometric relaxation time induced polarization fractal
dimensions (IPTg) and arithmetic relaxation time fractal
dimensions (IPTa) show similarities as delineated in Table 1. Their fractal dimensions are higher than those of samples SJ3
and SJ4 from the Lower Shajara Reservoir due to an increase
in their permeability as explained in table 1. On the other hand, the Upper Shajara reservoiris separated
from the Middle Shajara reservoir by yellow green mudstone
as revealed in figure 1. It is defined by three samples so called
SJ11, SJ12, SJ13 as explained in table 1. Moreover, their
geometric relaxation time fractal dimension and arithmetic
relaxation time fractal dimension are also higher than those of
sample SJ3 and SJ4 from the Lower Shajara Reservoir due to
an increase in their permeability as clarified in table 1. Overall a plot of geometric relaxation time fractal
dimension versus arithmetic relaxation time fractal dimension
as shown in figure 2 reveals three permeable zones of varying
Petrophysical properties. The higher fractal dimension zone
with fractal dimension higher than 2.75 (Figure 2) corresponds
to the complete Upper Shajara Reservoir, total Middle Shajara
Reservoir and Sample SJ1 and SJ2 from the lower Shajara
Reservoir. The middle fractal dimension zone with a value of
about 2.68 (Figure 2) resembles sample SJ4 from the lower
Shajara reservoir. The lower fractal dimension value2.43
allocates to sample SJ3 from the Lower Shajara reservoir as
shown in (Figure 2).</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-figure1.PNG" class="img-responsive center-block"/></div>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-table1.PNG" class="img-responsive center-block"/></div>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/IJPR-119-figure2.PNG" class="img-responsive center-block"/></div>
<p class="art-subhead"> Conclusion</p>
<ul class="art-para">
<li> The sandstones of the Shajara Reservoirs of the Shajara
formation of the permo-Carboniferous Unayzah group
were divided here into three units based on geometric
relaxation time fractal dimension of induced polarization.</li>
<li> The Units from base to top are: Lower Shajara Geometric
Relaxation time Fractal dimension Unit, Middle Shajara
Relaxation Time Fractal Dimension Unit, and Upper
Shajara Relaxation time Fractal Dimension Unit.</li>
<li> These units were also proved by arithmetic relaxation
time fractal dimension of induced polarization.</li>
<li> The fractal dimension was found to increase with increasing
grain size and permeability.</li>
</ul>
<p class="art-subhead">References</p><br>
<ol>
<li class="ref"><div id="1">Schlumberger C. Etude sur la prospection electrique dusous-sol GauthierVillars, Paris 1920.</div></li>
<li class="ref"><div id="2">Schoeppel RJ, Thrasher JE. Laboratory study of induced polarization in
sandstone rocks with varying salinity and shalyness. SPWLA 7th Annual
Logging Symposium, 9-11 May, Tulsa, Oklahoma, 1966.</div></li>
<li class="ref"><div id="3">Maosong T, Weinan W, Li L, Yizhong J, Deqin S. Estimation of permeability
of shaly sand reservoir frominduced polarization relaxation time spectra. J. Petrol. Sci. Eng. 2004; 45(1-2): 1-1). doi: 10.1016/j.petrol.2004.05.007</div></li>
<li class="ref"><div id="4">Liu X, Kong L, Zhang P, Zhou K. <a href="http://adsabs.harvard.edu/abs/2014JGE....11a5006L" target="_blank">Permeability estimation using relaxationtime
spectra derived from differential evolution inversion.</a> J. Geophys. Eng. 2014; 11: 1-8. doi: 10.1088/1742-2132/11/1/015006</div></li>
<li class="ref"><div id="5">Al-Khidir KE, Al-Laboun A, Al-Qurishi A, Benzagouta MS. Bimodal Pore Size
behavior of the Shajara formation reservoirs of the Permo-Carboniferous
Unayzah group, Saudi Arabia. Journal of Petroleum Exploration and
Production Technology. 2011; 1(1): 1-9. doi: 10.1007/s13202-011-0007-5</div></li>
<li class="ref"><div id="6">Al-Khidir KE, Benzagouta M, Al-Qurishi A, Al-Laboun A. <a href="https://www.researchgate.net/publication/233754398_Characterization_of_heterogeneity_of_the_Shajara_reservoirs_of_the_Shajara_formation_of_the_Permo-Carboniferous_Unayzah_group" target="_blank">Characterization
of heterogeneity of the Shajara Reservoirs of the Shajara formation of the
Permo-Carboniferous Unayzah group.</a> Arabian Journal of Geosciences. 2013; 6 (10): 3989-3995. doi: 10.1007/s12517-012-0656-9</div></li>
<li class="ref"><div id="7">Al-Khidir, et al. Geoscience; New findings reported from King Saud
University describe advances in geoscience. science letter. 2013; 359.</div></li>
<li class="ref"><div id="8">Al-Khidir KE, Benzagouta MS, Al-Quraishi AA, Al-Laboun AA. Differential
capacity fractal dimension and water saturation fractal dimension as
parameters for reservoir characterization: Shajara formation of the PermoCarboniferous
Unayzah Group as a case study. 10th Meeting of the Saudi
Society for Geoscience Geosciences for Sustainable Development 15-17
April 2013 KFUPM Campus, Dhahran, Saudi Arabia, 2013.</div></li>
<li class="ref"><div id="9">Al-Khidir KE. Pressure Head Fractal Dimension for Characterizing Shajara
Reservoirs of the Shajara Formation of the Permo-Carboniferous Unayzah
Group, Saudi Arabia. Arch Pet Environ Biotechnol. 2017; 2.</div></li>
</ol>   
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