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Volumn , Issue , 2011, Pages

Appraising unconventional resource plays: Separating reservoir quality from completion effectiveness

Author keywords

[No Author keywords available]

Indexed keywords

FRACTURE; GASOLINE; HORIZONTAL WELLS; HYDRAULIC FRACTURING; INFILL DRILLING; OIL WELLS; PETROLEUM GEOLOGY; RESOURCE VALUATION; RISK ASSESSMENT; SEISMOLOGY;

EID: 85064139189     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: 10.2523/14677-ms     Document Type: Conference Paper
Times cited : (35)

References (69)
  • 1
    • 0020167850 scopus 로고
    • Acoustic emissions as a tool for hydraulic fracture location: Experience at the Fenton Hill hot dry rock site
    • August 2008
    • Albright, J.N. and Pearson, C.F. 1982. Acoustic Emissions as a Tool for Hydraulic Fracture Location: Experience at the Fenton Hill Hot Dry Rock Site. SPEJ, Volume 22, pp. 523-530, August 2008.
    • (1982) SPEJ , vol.22 , pp. 523-530
    • Albright, J.N.1    Pearson, C.F.2
  • 2
    • 77955106985 scopus 로고    scopus 로고
    • Hydraulic fracturing for natural gas well of the Marcellus shale
    • Cincinnati, Ohio, September 21-24
    • Arthur, J.D. et al. 2008. Hydraulic Fracturing for Natural Gas Well of the Marcellus Shale, The Ground Water Protection Council 2008 Annual Forum, Cincinnati, Ohio, September 21-24.
    • (2008) The Ground Water Protection Council 2008 Annual Forum
    • Arthur, J.D.1
  • 3
    • 67649785243 scopus 로고    scopus 로고
    • Horizontal wells in tight gas sands - A method for risk management to maximize success
    • May 2009
    • Baihly, J., Grant, D., Fan. L., and Bodwadkar, S. 2009. Horizontal Wells in Tight Gas Sands - A Method for Risk Management To Maximize Success. SPE Production & Operations Journal, May 2009, p277-288.
    • (2009) SPE Production & Operations Journal , pp. p277-p288
    • Baihly, J.1    Grant, D.2    Fan, L.3    Bodwadkar, S.4
  • 4
    • 79952784266 scopus 로고    scopus 로고
    • Unlocking the shale mystery: How lateral measurements and well placement umpact completions and resultant production
    • Paper SPE 138427 San Antonio, Texas, USA, 2-3 November
    • Baihly, J., Malpani, R., Edwards, C., Han S.Y., Kok, J., Tollefsen, E. and Wheeler, W. 2010. Unlocking the Shale Mystery: How Lateral Measurements and Well Placement Umpact Completions and Resultant Production. Paper SPE 138427 presented at the SPE Tight Gas Completions Conference, San Antonio, Texas, USA, 2-3 November.
    • (2010) The SPE Tight Gas Completions Conference
    • Baihly, J.1    Malpani, R.2    Edwards, C.3    Han, S.Y.4    Kok, J.5    Tollefsen, E.6    Wheeler, W.7
  • 5
    • 1142303072 scopus 로고    scopus 로고
    • A practical guide to hydraulic fracture diagnostic technologies
    • Paper SPE 77442 San Antonio, Texas, 29 September-2 October
    • Barree, R.D., Fisher, M.K., Woodroof, R.A. 2002. A Practical Guide to Hydraulic Fracture Diagnostic Technologies. Paper SPE 77442 presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 29 September-2 October.
    • (2002) The SPE Annual Technical Conference and Exhibition
    • Barree, R.D.1    Fisher, M.K.2    Woodroof, R.A.3
  • 8
    • 58949098930 scopus 로고    scopus 로고
    • The relationship between fracture complexity, reservoir properties, and fracture treatment design
    • Paper SPE 115769 Denver, Colorado, USA, 21-24 September
    • Cipolla, C.L., Warpinski, N.R., Mayerhofer, M.J., and Lolon, E. P. 2008. The Relationship between Fracture Complexity, Reservoir Properties, and Fracture Treatment Design. Paper SPE 115769 presented at the 2008a SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, 21-24 September.
    • (2008) The 2008a SPE Annual Technical Conference and Exhibition
    • Cipolla, C.L.1    Warpinski, N.R.2    Mayerhofer, M.J.3    Lolon, E.P.4
  • 9
    • 63849301930 scopus 로고    scopus 로고
    • Hydraulic fracture complexity: Diagnosis, remediation, and exploitation
    • Paper SPE 115771 Perth, Australia, October 20-22
    • Cipolla, C.R., Warpinski, N.R., Mayerhofer, M.J. 2008b. Hydraulic Fracture Complexity: Diagnosis, Remediation, and Exploitation. Paper SPE 115771 presented at the 2008 Asia Pacific Oil & Gas Conference, Perth, Australia, October 20-22
    • (2008) The 2008 Asia Pacific Oil & Gas Conference
    • Cipolla, C.R.1    Warpinski, N.R.2    Mayerhofer, M.J.3
  • 10
    • 79952931262 scopus 로고    scopus 로고
    • Reducing exploration and appraisal risk in low-permeability reservoirs using microseismic fracture mapping
    • Paper CSUG/SPE 137437 Alberta, Canada, 19-21 October
    • Cipolla, C., Mack, M., and Maxwell, S. 2010a. Reducing Exploration and Appraisal Risk in Low-Permeability Reservoirs Using Microseismic Fracture Mapping. Paper CSUG/SPE 137437 presented at the Canadian Unconventional Resources & International Petroleum Conference held in Calgary, Alberta, Canada, 19-21 October.
    • (2010) The Canadian Unconventional Resources & International Petroleum Conference Held in Calgary
    • Cipolla, C.1    Mack, M.2    Maxwell, S.3
  • 12
    • 79953007169 scopus 로고    scopus 로고
    • Reducing exploration and appraisal risk in low-permeability reservoirs using microseismic fracture mapping
    • Paper SPE 138103 Peru, 1-3 December 2010
    • Cipolla, C., Mack, M., and Maxwell, S. 2010c. Reducing Exploration and Appraisal Risk in Low-Permeability Reservoirs Using Microseismic Fracture Mapping. Paper SPE 138103 presented at the SPE Latin American & Caribbean Petroleum Engineering Conference held in Lima, Peru, 1-3 December 2010.
    • (2010) The SPE Latin American & Caribbean Petroleum Engineering Conference Held in Lima
    • Cipolla, C.1    Mack, M.2    Maxwell, S.3
  • 17
    • 40349100573 scopus 로고    scopus 로고
    • Contacting more of the Barnett Shale through an integration of real-time microseismic monitoring, petrophysics, and hydraulic fracture design
    • Paper SPE 110562 Anaheim, California, USA, October 12-14
    • Daniels, J., Waters, G., LeCalvez, J., Lassek, J., and Bentley, D. 2007. Contacting More of the Barnett Shale Through an Integration of Real-Time Microseismic Monitoring, Petrophysics, and Hydraulic Fracture Design. Paper SPE 110562 presented at the 2007 SPE Annual Technical Conference and Exhibition, Anaheim, California, USA, October 12-14.
    • (2007) The 2007 SPE Annual Technical Conference and Exhibition
    • Daniels, J.1    Waters, G.2    LeCalvez, J.3    Lassek, J.4    Bentley, D.5
  • 20
    • 22044439272 scopus 로고    scopus 로고
    • Optimizing horizontal completion techniques in the Barnett shale using microseismic fracture mapping
    • Paper SPE 90051 Houston, Texas, September 26-29, 2004
    • Fisher, M.K., Heinze, J.R., Harris, C.D., Davidson, B.M, Wright, C.A. and Dunn, K.P. 2004. Optimizing Horizontal Completion Techniques in the Barnett Shale Using Microseismic Fracture Mapping. Paper SPE 90051 presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, September 26-29, 2004.
    • (2004) The SPE Annual Technical Conference and Exhibition
    • Fisher, M.K.1    Heinze, J.R.2    Harris, C.D.3    Davidson, B.M.4    Wright, C.A.5    Dunn, K.P.6
  • 22
    • 77049100761 scopus 로고    scopus 로고
    • A statistical approach to the effective economic modeling and portfolio selection of unconventional resource opportunities
    • Paper SPE 121525 Amsterdam, The Netherlands, 8-11 June
    • Gouveia, J. and Citron, G.P. 2009. A Statistical Approach to the Effective Economic Modeling and Portfolio Selection of Unconventional Resource Opportunities. Paper SPE 121525 presented at the SPE EUROPEC/EAGE Annual Conference and Exhibition, Amsterdam, The Netherlands, 8-11 June.
    • (2009) The SPE EUROPEC/EAGE Annual Conference and Exhibition
    • Gouveia, J.1    Citron, G.P.2
  • 25
    • 34250841346 scopus 로고    scopus 로고
    • Evaluating resource plays with statistical models
    • Paper SPE 107435 Dallas, Texas, USA, 1-3 April
    • Hall, R.K. 2007. Evaluating Resource Plays With Statistical Models. Paper SPE 107435 presented at the SPE Hydrocarbon Economics and Evaluation Symposium, Dallas, Texas, USA, 1-3 April.
    • (2007) The SPE Hydrocarbon Economics and Evaluation Symposium
    • Hall, R.K.1
  • 26
    • 84856710299 scopus 로고    scopus 로고
    • Improved petrophysical core measurements on tight shale reservoirs using retort and crushed samples
    • Paper SPE 147456 Denver, Colorado, 20 October-2 November
    • Handwerger, D.A., Suarez-Rivera, R., Vaughn, K.I., and Keller, J.F. 2011. Improved Petrophysical Core Measurements on Tight Shale Reservoirs Using Retort and Crushed Samples. Paper SPE 147456 presented at SPE Annual Technical Conference and Exhibition, Denver, Colorado, 20 October-2 November.
    • (2011) SPE Annual Technical Conference and Exhibition
    • Handwerger, D.A.1    Suarez-Rivera, R.2    Vaughn, K.I.3    Keller, J.F.4
  • 27
    • 84865823309 scopus 로고    scopus 로고
    • Recent advances in the analytical methods used for shale gas reservoir gas-in-place assessment
    • Article
    • Hartman, R.C., Lasswell, P., and Bhatta, N. 2008. Recent Advances in the Analytical Methods Used for Shale Gas Reservoir Gas-in-Place Assessment. Search and Discovery Article 40317.
    • (2008) Search and Discovery
    • Hartman, R.C.1    Lasswell, P.2    Bhatta, N.3
  • 28
    • 0032311048 scopus 로고    scopus 로고
    • Quantitative lithology: Open and case hole application derived from integrated core chemistry and mineralogy data base
    • Harvey, K, and Lovell, M.A
    • Herron, M.M., and Herron, S.L. 1998. Quantitative Lithology: Open and Case Hole Application Derived from Integrated Core Chemistry and Mineralogy Data Base. In Harvey, P.K, and Lovell, M.A. Core-Log Integration, Geological Society London Special Publications 136, 81-95.
    • (1998) Core-Log Integration, Geological Society London Special Publications , vol.136 , pp. 81-95
    • Herron, M.M.1    Herron, S.L.2
  • 31
    • 84986397305 scopus 로고
    • Locating microearthquakes induced by hydraulic fracturing in crystalline rock
    • September 1987
    • House, L. 1987. Locating Microearthquakes Induced by Hydraulic Fracturing in Crystalline Rock. Geophys. Res. Letters, Vol. 14, pp. 919-921, September 1987.
    • (1987) Geophys. Res. Letters , vol.14 , pp. 919-921
    • House, L.1
  • 32
    • 79952956489 scopus 로고    scopus 로고
    • Using the Barnett shale (and other NA resource plays) to understand global resource play deliverability
    • Fort Worth, TX, 30-31 March
    • Hovey, R.K. 2010. Using the Barnett Shale (and other NA Resource Plays) To Understand Global Resource Play Deliverability. Presentation presented at the Developing Unconventional Gas (DUG) Conference, Fort Worth, TX, 30-31 March.
    • (2010) Presentation Presented at The Developing Unconventional Gas (DUG) Conference
    • Hovey, R.K.1
  • 33
    • 70349456928 scopus 로고    scopus 로고
    • Increasing fracture path complexity and controlling downward fracture growth in the Barnett Shale
    • Paper SPE 119896 Fort Worth, Texas, USA, 16-18 November
    • King, G.E., Haile, L., Shuss, J., and Dobkins, T.A. 2008. Increasing Fracture Path Complexity and Controlling Downward Fracture Growth in the Barnett Shale. Paper SPE 119896 presented at the 2008 SPE Shale Gas Production Conference, Fort Worth, Texas, USA, 16-18 November.
    • (2008) The 2008 SPE Shale Gas Production Conference
    • King, G.E.1    Haile, L.2    Shuss, J.3    Dobkins, T.A.4
  • 34
    • 78651107906 scopus 로고    scopus 로고
    • Thirty years of gas shale fracturing: What have we learned?
    • Paper SPE 133456 Florence, Italy, 19-22 September
    • King, G.E. 2010. Thirty Years of Gas Shale Fracturing: What Have We Learned? Paper SPE 133456 presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19-22 September.
    • (2010) The SPE Annual Technical Conference and Exhibition
    • King, G.E.1
  • 35
    • 84861417616 scopus 로고    scopus 로고
    • Borehole stress in anisotropic elastic media revisited: Comparison between analytical amadei and 3D finite element models
    • Paper
    • Karpfinger, F., Prioul, R., Gaede, O., and Jocker, J. 2011. Borehole Stress in Anisotropic Elastic Media Revisited: Comparison between Analytical Amadei and 3D Finite Element Models. Paper submitted to Int. Jour Rock Mechanics and Mining Sciences.
    • (2011) Int. Jour Rock Mechanics and Mining Sciences
    • Karpfinger, F.1    Prioul, R.2    Gaede, O.3    Jocker, J.4
  • 37
    • 34247106383 scopus 로고    scopus 로고
    • Real-time microseismic monitoring of hydraulic fracture treatment: A tool to improve completion and reservoir management
    • SPE 106159, College Station, TX, USA, Jan
    • Le Calvez, J. H., Klem, R., Tanner, K. V., Bennett, L., Craven, M. 2007. Real-Time Microseismic Monitoring of Hydraulic Fracture Treatment: A Tool to Improve Completion and Reservoir Management. SPE 106159, SPE Hydraulic Fracturing Technology Conference, College Station, TX, USA, 29-31 Jan.
    • (2007) SPE Hydraulic Fracturing Technology Conference , pp. 29-31
    • Le Calvez, J.H.1    Klem, R.2    Tanner, K.V.3    Bennett, L.4    Craven, M.5
  • 40
    • 1142293785 scopus 로고    scopus 로고
    • Microseismic imaging of hydraulic fracture complexity in the Barnett shale
    • Paper SPE 77440 San Antonio, Texas, September 29-October 2
    • Maxwell, S.C., Urbancic, T.I., Steinsberger, N.P., and Zinno, R. 2002. Microseismic Imaging of Hydraulic Fracture Complexity in the Barnett Shale. Paper SPE 77440 presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, September 29-October 2.
    • (2002) The SPE Annual Technical Conference and Exhibition
    • Maxwell, S.C.1    Urbancic, T.I.2    Steinsberger, N.P.3    Zinno, R.4
  • 46
    • 80052420112 scopus 로고    scopus 로고
    • Evaluation of production log data from horizontal wells drilled in organic shales
    • SPE 144326 The Woodlands, Texas, USA, 14-16 June 2011
    • Miller, C., Waters, G., and Rylander, E. 2011. Evaluation of Production Log Data from Horizontal Wells Drilled in Organic Shales. SPE 144326 presented at the SPE Americas Unconventional Gas Conference, The Woodlands, Texas, USA, 14-16 June 2011.
    • (2011) The SPE Americas Unconventional Gas Conference
    • Miller, C.1    Waters, G.2    Rylander, E.3
  • 47
    • 79953095784 scopus 로고    scopus 로고
    • Imaging texture and porosity in mudstones and shales: Comparison of secondary and ion-milled backscatter SEM methods
    • Paper CSUG/SPE 138975 Calgary, Alberta, 19-21 October
    • Milner, M., McLin, R., and Petriello, J. 2010. Imaging Texture and Porosity in Mudstones and Shales: Comparison of Secondary and Ion-Milled Backscatter SEM Methods. Paper CSUG/SPE 138975 presented at the Canadian Unconventional Resources & International Petroleum Conference and Exhibition, Calgary, Alberta, 19-21 October.
    • (2010) The Canadian Unconventional Resources & International Petroleum Conference and Exhibition
    • Milner, M.1    McLin, R.2    Petriello, J.3
  • 48
    • 0025570519 scopus 로고
    • A practical model for organic richness from porosity and resistivity logs
    • Passey, Q.R., Creaney, S., Kulla, J.B., Moretti, F.J., and Stroud, J.D. 1990. A Practical Model for Organic Richness from Porosity and Resistivity Logs. AAPG Bulletin 74 (12): 1777-1794.
    • (1990) AAPG Bulletin , vol.74 , Issue.12 , pp. 1777-1794
    • Passey, Q.R.1    Creaney, S.2    Kulla, J.B.3    Moretti, F.J.4    Stroud, J.D.5
  • 52
    • 77954227725 scopus 로고    scopus 로고
    • Unconventional geophysics for unconventional plays
    • Paper SPE 131779 Pittsburgh, Pennsylvania, USA, February 23-25
    • Rich, J.P. and Ammerman, M. 2010. Unconventional Geophysics for Unconventional Plays. Paper SPE 131779 presented at the Unconventional Gas Conference, Pittsburgh, Pennsylvania, USA, February 23-25.
    • (2010) The Unconventional Gas Conference
    • Rich, J.P.1    Ammerman, M.2
  • 53
    • 58849127917 scopus 로고    scopus 로고
    • A practical use of shale petrophysics for stimulation design optimization: All shale plays are not clones of the Barnett shale
    • Paper SPE 115258 Denver, Colorado, 21-24 September
    • Rickman, R., Mullen, M., Petre, E., Grieser, B., and Kundert, D. 2008. A Practical Use of Shale Petrophysics for Stimulation Design Optimization: All Shale Plays Are Not Clones of the Barnett Shale. Paper SPE 115258 presented at SPE Annual Technical Conference and Exhibition, Denver, Colorado, 21-24 September.
    • (2008) SPE Annual Technical Conference and Exhibition
    • Rickman, R.1    Mullen, M.2    Petre, E.3    Grieser, B.4    Kundert, D.5
  • 54
    • 0020889304 scopus 로고
    • Organic carbon in bakken formation, United States portion of Williston Basin
    • Schmoker, J.W., and Hester, T.C., 1983. Organic Carbon in Bakken Formation, United States Portion of Williston Basin. AAPG Bulletin 67 (12): 2165-2174.
    • (1983) AAPG Bulletin , vol.67 , Issue.12 , pp. 2165-2174
    • Schmoker, J.W.1    Hester, T.C.2
  • 57
    • 33750990484 scopus 로고    scopus 로고
    • Effect of layered heterogeneity on fracture initiation in tight gas shales
    • Paper SPE 103327 San Antonio, Texas, 24-27 September
    • Suarez- Rivera, R, Green, S.J., McLennan, J., and Bai, M. 2006. Effect of Layered Heterogeneity on Fracture Initiation in Tight Gas Shales. Paper SPE 103327 presented at the 2006 SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 24-27 September.
    • (2006) The 2006 SPE Annual Technical Conference and Exhibition
    • Suarez-Rivera, R.1    Green, S.J.2    McLennan, J.3    Bai, M.4
  • 58
    • 79956303982 scopus 로고    scopus 로고
    • Effects of proppant selection on shale fracture treatments
    • May
    • Terracina, J. 2011. Effects of Proppant Selection on Shale Fracture Treatments. Journal of Petroleum Technology May: 26-29.
    • (2011) Journal of Petroleum Technology , pp. 26-29
    • Terracina, J.1
  • 59
    • 0028667396 scopus 로고
    • Core-based prediction of lithologic stress contrasts in East Texas formations
    • SPE 21847.Vincent, M.C. 2009. Examining our Assumptions - Have Oversimplifications Jeopardized Our Ability to Design Optimal Fracture Treatments? Paper SPE 119143 2009 Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, January 19-21
    • Thiercelin, M.J. and Plumb, R.A. 1994. Core-Based Prediction of Lithologic Stress Contrasts in East Texas Formations. SPE Form Eval: 9 (4): 251-258. SPE 21847.Vincent, M.C. 2009. Examining our Assumptions - Have Oversimplifications Jeopardized Our Ability to Design Optimal Fracture Treatments? Paper SPE 119143 presented at the 2009 Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, January 19-21.
    • (1994) SPE Form Eval , vol.9 , Issue.4 , pp. 251-258
    • Thiercelin, M.J.1    Plumb, R.A.2
  • 61
    • 70449587521 scopus 로고    scopus 로고
    • Simultaneous hydraulic fracturing of adjacent horizontal wells in the woodford shale
    • Paper SPE119635 The Woodlands, Texas, USA, 19-21 January
    • Waters, G., Dean, B., Downie, R., Kerrihard, K., Austbo, L., and McPherson, B. 2009. Simultaneous Hydraulic Fracturing of Adjacent Horizontal Wells in the Woodford Shale. Paper SPE119635 presented at the SPE Hydraulic Fracturing Tech. Conference., The Woodlands, Texas, USA, 19-21 January.
    • (2009) The SPE Hydraulic Fracturing Tech. Conference.
    • Waters, G.1    Dean, B.2    Downie, R.3    Kerrihard, K.4    Austbo, L.5    McPherson, B.6
  • 62
    • 84856637007 scopus 로고    scopus 로고
    • The effect of mechanical properties anisotropy in the generation of hydraulic fractures in organic shales
    • Paper SPE 146776 Denver, Colorado, 20 October - 2 November
    • Waters, G.A., Lewis, R.E., and Bentley, D.C. 2011. The Effect of Mechanical Properties Anisotropy in the Generation of Hydraulic Fractures in Organic Shales. Paper SPE 146776 presented at SPE Annual Technical Conference and Exhibition, Denver, Colorado, 20 October - 2 November.
    • (2011) SPE Annual Technical Conference and Exhibition
    • Waters, G.A.1    Lewis, R.E.2    Bentley, D.C.3
  • 63
    • 1942421676 scopus 로고    scopus 로고
    • Analysis and prediction of microseismicity induced by hydrualic fracturing
    • Warpinski, N. R., Wolhart, S.L., Wright, C.A. 2004. Analysis and Prediction of Microseismicity Induced by Hydrualic Fracturing. SPE Journal 9-1:24
    • (2004) SPE Journal , vol.9-1 , pp. 24
    • Warpinski, N.R.1    Wolhart, S.L.2    Wright, C.A.3
  • 64
    • 52049113038 scopus 로고    scopus 로고
    • Stimulating unconventional reservoirs: Maximizing network growth while optimizing fracture conductivity
    • Paper SPE 114173 Keystone, Colorado, USA, February 10-12
    • Warpinski, N.R., Mayerhofer, M.J., Vincent, M.C., Cipolla, C.L., and Lolon, E.P. 2008. Stimulating Unconventional Reservoirs: Maximizing Network Growth while Optimizing Fracture Conductivity. Paper SPE 114173 presented at the 2008 SPE Unconventional Reservoirs Conference, Keystone, Colorado, USA, February 10-12.
    • (2008) The 2008 SPE Unconventional Reservoirs Conference
    • Warpinski, N.R.1    Mayerhofer, M.J.2    Vincent, M.C.3    Cipolla, C.L.4    Lolon, E.P.5
  • 65
    • 70450211833 scopus 로고    scopus 로고
    • Integrating microseismic monitoring with well completions, reservoir behavior, and rock mechanics
    • Paper SPE 125239 San Antonio, Texas, USA, June 15-17
    • Warpinski, N.R. 2009a. Integrating Microseismic Monitoring With Well Completions, Reservoir Behavior, and Rock Mechanics. Paper SPE 125239 presented at the SPE Tight Gas Completions Conference, San Antonio, Texas, USA, June 15-17.
    • (2009) The SPE Tight Gas Completions Conference
    • Warpinski, N.R.1


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