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Rock Heterogeneity 23 October 2014
by Roberto Suarez-Rivera .
W.D.Von Gonten
Laboratories, LLC
“Understanding and working with subsurface: importance of geomechanics and a perspective from the private sector”
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Micro-seismic monitoring suggest strong lateral heterogeneity
Production data suggests strong lateral heterogeneity
Log and seismic data confirm strong lateral heterogeneity
Heterogeneity is a key component of the rock mechanical behavior
Heterogeneity
SPE ATW on Horizontal Well Completions on North American Shales • Roberto Suarez-Rivera 11-13 September 2013, Rancho Palos Verdes, CA
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sH=sh
sh=sH
Heterogeneity
Suarez-Rivera et al, 2012/2013, also Burghardt et.al., ARMA 2012
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Well-1 Well-2 Well-3 Well-4 Well-5 Well-6
Log-Scale and Seismic-Scale Heterogeneity
Well log data Seismic data Suarez-Rivera et al, 2012/2013,
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Defining Rock Heterogeneity
By heterogeneity I mean: the natural variability of properties in geologic systems, the effect of interfaces and planes of weakness on the rock behavior the effect of abrupt and transitional changes in rock properties, and the
overall spatial distribution of these. understanding scaling effects
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Rock Fabric and Fracture Containment
s V = 3000 psi sH = 1500 psi sh = 1000 psi
The World is a Magical World
The Role of Rock Fabric on the Propagation of Hydraulic Fractures, Invited talk, University of Texas at Austin, 14 October 2012. • Roberto Suarez-Rivera
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Rock Fabric and Fracture Containment
s V = 3000 psi sH = 1500 psi sh = 1000 psi
The World is a Magical World
The Role of Rock Fabric on the Propagation of Hydraulic Fractures, Invited talk, University of Texas at Austin, 14 October 2012. • Roberto Suarez-Rivera
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sV
sV
sh
Sub-horizontal fractures open along weak planes, and against the maximum principal stress, while the wellbore pressure never reaches this value
Horizontal wellbore configuration
Rock Fabric and Planes of Weakness The World is a Magical World
SPE166505• Regions of hydraulic fracture connectivity • Roberto Suarez-Rivera
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Heterogeneity and Hydraulic Fracturing
Exposed surface area
SPE166505• Regions of hydraulic fracture connectivity• R. Suarez-Rivera
Far-wellbore Fracture
Near-wellbore Fracture
Wellbore/ Fracture Connector
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Millimeter-Scale to Log-Scale Heterogeneity
Core Heterogeneity Log Heterogeneity
SPWLA 53rd Annual Logging Symposium • R. Suarez-Rivera et al., June 16-20, 2012
Interfaces?
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Summary and Conclusions
Rock heterogeneity represents a big opportunity and challenge It affects reservoir characterization and reserves in place It affects the reservoir contact and restricts reservoir production It prevent the industry from understanding cause and effect relationships It makes production procedures inefficient (increasing cost and risk)