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Porosity and permeability Relationship

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Sara Al Ameri

on 10 October 2015

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Transcript of Porosity and permeability Relationship

Porosity and Permeability Relationship
Relationship between porosity, permeability and texture
Texture of the reservoir rock is related to the original depositional fabric of the sediment which is modified by subsequent diagenesis
This diagenesis may be negligible in many sandstones but in carbonate it may be enough to obliterate all traces of original depositional features
Content
Porosity and Permeability

Geological classification of porosity

Geological classification of permeability

Relationship between porosity, permeability and texture

Kozeny correlation

Porosity
Porosity is a space that store hydrocarbon, it could be either interconnected or isolated.
Its percentage of pore volume to bulk volume.
It doesn’t have a unit.

Name : Sara Al Ameri
ID # : 2009 35355
Permeability
It’s the ability of fluids to pass through a porous material.
The Unit of permeability is Darcy.

Instructor : Prof. Haydar Baker
Petrophysics (51)
Based on the time of origin,
mode of origin
and
distribution relationship of pores spaces
, porosity is divided into two types.
Primary porosity
Secondary porosity
Geological classification of porosity
Intercrystaline voids:
voids between cleavage planes of crystals,
Intergranular voids:
voids between grains
Bedding Planes voids:
voids of many varieties are concentrated parallel to the bedding planes.
Miscellaneous Sedimentary Voids:
Voids resulting from packing of oolites, vuggy, cavernous, created by living organisms, fossil.

The porosity resulting from diagenesis
.
Solution porosity:
voids caused by organisms and later enlarged by solution/ weathering
Dolomitization:
a process by which limestone is transformed into dolomite
Fractured porosity:
voids caused by tectonic activities such us folding or faulting
Miscellaneous Secondary voids:
saddle reefs, pitches and flats,
Secondary porosity
In carbonate reservoir, secondary porosity is much more important than primary porosity.
Petroleum reservoirs can have primary permeability and secondary permeability
Geological classification of permeability
Primary Permeability
Secondary Permeability
also known as matrix permeability originated at the time of deposition and lithification sedimentary rocks.
Resulted from the alteration of the rock matrix by compaction, cementation, fracturing and solution
Compaction and cementation generally
reduce
the permeability whereas fracturing and solution tend to
increase
it
The textural parameters of an unconsolidated sediment that may affect porosity and permeability
Grain shape
Grain size
Sorting
Fabric ( packing and orientation )

Relationship between Q,K and Grain Shape
Roundness :
describes the degree of angularity of the particle
Sphericity :
describes the degree to which the particle approaches a spherical shape
Porosity might
decrease
with sphericity because spherical grains may be more tightly packed than subspherical ones
Grain Shape
Relationship between Q, K and Grain Size
coarser sands sometimes have higher
porosities
than finer sand its due to the correlation factor such us sorting and cementation
Permeability
declines with decreasing grain size because pore diameter decrease
Porosity increase with improved sorting
As sorting
decreases
framework forming grains are infilled by smaller particles so the permeability and porosity
decrease
as well.
Relationship between Q, K and Grain sorting
Relationship between Q, K and Grain Packing
The two important characteristics of fabric of a sediment are how the grains are
packed
and how they are
oriented
Packing is major influence in porosity of sediment.
Porosity and permeability
reduces
due to packing adjustment
Relationship between Q, K and Grain Orientation
the vertical permeability is generally lower than the horizontal permeability because of stratification
The ratio of vertical and horizontal permeability in a reservoir is important because its effect on coning as the oil and gas are produced
Grain size and sorting are not related to only to the final depositional environment but also reflect the characteristic of the rock from which they were derived
The study have recorded
Bars – Q:41% K:93%
Beaches – Q:49% K: 68%
Dunes – Q:49% K: 54%

Relationship between Q, K and depositional process
Summary
Primary Porosity
Kozeny Correlation
the relationship between permeability and porosity is qualitative
there is not a specifically defined trendline between permeability and porosity values.
Such a relationship is very useful in the understanding of fluid flow through porous media.

The porosity of the rock resulting from its original depositional structure.
expressing permeability as a function of porosity and specific surface area.
References
Tiab, Djebbar, Donaldson, Erie C. 2011. Petrophysics: Theory and Practice of Measuring Reservoir Rock and Fluid Transport Properties. Third Edition. Oxford: Gulf Professional Publishing. ISBN: 9780750677110

Selley, Richard C, 1998. Element of Petroleum Geology. Second Edition. London: Academic Press Limited. ISBN: 9780126363708

http://www2.ggl.ulaval.ca/personnel/paglover/CD%20Contents/Formation%20Evaluation%20English/Chapter%205.PDF

http://infohost.nmt.edu/~petro/faculty/Engler524/PET524-1a-porosity.pdf

Thank you for your attention
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