Publications

Heffer, K.J., 2014, Percolation threshold for interaction of the elastic stress fields of aligned cracks as an alternative explanation of critical crack densities. In: Faulkner, D. R., Mariani, E. & Mecklenburgh, J. (eds) Rock Deformation from Field, Experiments and Theory: A Volume in Honour of Ernie Rutter. Geological Society, London, Special Publications, 409, http://dx.doi.org/10.1144/SP409.1 abstract

Heffer, K.J., 2013, Critical crack densities due to interactions of tensile stress fields: basis for a practical tool of fracture prediction from rates, extended abstract of presentation to EAGE/SPE Europec, 10-14 June 2013. pdf

Heffer, K.J., 2012c, Observing reservoir dynamics and changing reservoir management, presentation at the 'Finding Petroleum' event 'New ideas in Improved Recovery and EOR'  in London on 18 April 2012.  video & slides

Bamford, D., 2012,  Reservoir Dynamics and the New Geophysics, presentation at the 'Finding Petroleum' event ' New Ideas in Geophysical Technology' in London on 21 March 2012 on behalf of S. Crampin & K. Heffer.video & slides 

Heffer, K.J., 2012b, Fracture characterization through rate correlation analysis, SPE paper 154429, presented at EAGE/SPE EUROPEC, 4-7 June 2012, Copenhagen, Denmark. pdf

Heffer, K.J., 2012a, Geomechanical mechanisms involving faults and fractures for observed correlations between fluctuations in flowrates at wells in North Sea oilfields. In: Spence, G. H., Redfern, J., Aguilera, R., Bevan, T. G., Cosgrove, J. W., Couples, G. D. & Daniel, J.-M. (eds) Advances in the Study of Fractured Reservoirs. Geological Society, London, Special Publications, 374, http://dx.doi.org/10.1144/SP409.1,  http://sp.lyellcollection.org/content/374/1/173. first published online August 28, 2012,  abstract

Zhang, X., Koutsabeloulis, N., Kristiansen, T.G., Heffer, K.J., Main, I.G., Greenhough, J., Hussein, A.M., 2011, Modeling of Depletion Induced Micro-Seismic by Coupled Reservoir Simulation: Application to Valhall Field, SPE paper 143378, prepared for SPE EUROPEC/EAGE Annual Conference and Exhibition held in Vienna, Austria, 23–26 May 2011. pdf

Heffer, K.J., Greehough, J., Main, I.G., 2011, Monitoring geomechanical changes in naturally fractured reservoirs through rate correlation analysis, extended abstract of presentation at EAGE Workshop on Naturally & Hydraulically Induced Fractured Reservoirs, 10-13 April 2011, Nafplio, Greece. pdf

Heffer, K.J., Greehough, J., Main, I.G., 2010, The accuracy of production forecasts: conventional models versus a statistical model for short-term predictions allied to reservoir monitoring and characterization, extended abstract of presentation at Petex 2010, London, 23-25 November. pdf

 Heffer, K. J., Greenhough, J., Main, I.G., Zhang, X, Hussein, A.M., Nasreldin, G., Koutsabeloulis, N. C., 2010, Low-cost monitoring of inter-well reservoir communication paths through correlations in well rate fluctuations: case studies from mature fields in the North Sea, SPE paper 130734, presented at Europec ’10, Barcelona, 14-17 June, 2010. pdf

 Heffer, K. J., Koutsabeloulis, N. C., Zhang, X., Main, I. G., Li, L., 2010, Reservoirs near a critical geomechanical point: review of theory, field evidence, prevalence and management, submitted to SPE Journal, SJ-0210-0006 pdf

 Heffer, K.J., Greenhough, J., Main, I.G., Zhang, X., Koutsabeloulis, N.C., 2008, Correlations in well rate fluctuations used for reservoir monitoring: inferring conductive faults and fractures, extended abstract for Petex 2008, London. pdf

 Heffer, K. J., Koutsabeloulis, N. C., Zhang, X., Main, I. G., Li, L., 2007, Identification of active (and therefore potentially conductive) faults and fractures through statistical correlations in production and injection rates and coupled geomechanical-flow modelling, SPE paper 107164, presented at SPE Europec / EAGE annual conference and exhibition, London, 11-14 June pdf

 Zhang, X., Koutsabeloulis, N.,C., Heffer, K.J., 2007, Hydro-Mechanical Modelling of Critically Stressed and Faulted Reservoirs, AAPG Bulletin, v. 91, no. 1 (January 2007), pp. 31–50 pdf

 Main, I.G., Li, L., Heffer, K.J., Papasouliotis, O., Leonard, T., Koutsabeloulis, N.C. & Zhang, X., (2007) “The Statistical Reservoir Model: Calibrating faults and fractures, and predicting reservoir response to water flood”, In: JOLLEY, S. J., BARR, D., WALSH, J. J. & KNIPE, R. J. (eds) Structurally Complex Reservoirs, Geological Society, London, Special Publications, 292, 469–482. doi: 10.1144/SP292.25 pdf

 Zhang, X., Koutsabeloulis, N.,C., Heffer, K.J., Main, I.G. & Li, L.,  (2007) “Coupled geomechanics-flow modelling at and below a critical stress state used to investigate common statistical properties of field production data”, In: JOLLEY, S. J., BARR, D., WALSH, J. J. & KNIPE, R. J. (eds) Structurally Complex Reservoirs, Geological Society, London, Special Publications, 292, 453–468, doi: 10.1144/SP292.24 pdf

Zhang, X., Koutsabeloulis, N.,C., Heffer, K.J., Main, I.G. & Li, L.,  (2007) "Geomechanics: an intrinsic component of reservoir behaviour to be identified for maximum recovery (with applications)", presentation at Devex 2007,  Aberdeen,  15th May, 2007 pdf

 Heffer, K.J., (2007) “Proximity to a critical point: evidence from, and implications for, hydrocarbon reservoirs”, in Lewis H. and Couples, G.D. (eds) The Relationship between Damage and Localization, Geological Society, London, Special Publications, 289, 227-239, doi: 10.1144/SP289.13. pdf

 Main, I. G., L. Li, K. J. Heffer, O. Papasouliotis, and T. Leonard, (2006) Long-range, critical-point dynamics in oil field flow rate data, Geophys. Res. Lett., 33, L18308, doi:10.1029/2006GL027357. pdf

 Heffer, K.J. & King, P.R.( 2006) “Spatial scaling of effective modulus and correlation of deformation near the critical point of fracturing”, Pure & Applied Geophysics, Vol 163, No. 10. pdf

Heffer, K.J. (2005) “The NERC micro-to-macro programme - implications for fluid resource management”, in Shaw, R. P. (ed.) 2005. Understanding the Micro to Macro Behaviour of Rock–Fluid Systems. Geological Society, London, Special Publications, 249, 5–27. pdf

Zhang, X., Koutsabeloulis, N.,C., & Heffer, K.J., (2005) "Impacts of Stress States on Hydro-Mechanical Responses of Faulted Reservoirs" extended abstract P303, EAGE 67th Conference & Exhibition — Madrid, Spain, 13 - 16 June 2005  pdf

 Heffer, KJ (2005) (Book Review) “Theory of linear poroelasticity with applications to geomechanics and hydrogeology” by Herbert F Wang, Journal of Petroleum Science and Engineering Vol 45/3-4 pp 291-292

 Heffer, K.J. (2002) “Reservoirs at a critical point – a useful concept in fracture characterization”, extended abstract of presentation to Petex, 2002, London, Dec 10-12. pdf

 Heffer, K.J. (2002) “Geomechanical Influences in Water Injection Projects: An Overview” Oil & Gas Science and Technology – Rev IFP Vol 57 (2002), No. 5 pp 415-422. pdf

 Heffer K.J., King, P.R. & Jones, A.D.W. (1999) ‘Fracture Modelling as Part of Integrated Reservoir Characterization’ SPE 53347 presented at the 1999 Middle East Oil Show, Bahrain, 20-23 February, 1999. pdf

 Daly C, Jones A, Heffer K J, Hektoen A-L, Holden L, & Davis, M (1998) “Reconciling fracture and test permeability in 3D heterogeneity models” presentation to the AAPG Annual Conference, Salt Lake City, July 1998 pdf 

 Heffer K J & Fox R J (1996) "Geomechanics, Faults & Fluid Flow" invited talk to the conference "Faulting, Fault Sealing and Fluid Flow in Hydrocarbon Reservoirs", University of Leeds, 23-25 September 1996

 Heffer K J & Koutsabeloulis N C (1996) "The Dynamic 3-D Reservoir - Both Hydraulically and Geomechanically" SPE 35519 presented at the European 3-D Reservoir Modelling Conference, Stavanger, Norway, 16-17 April 1996 pdf

 Heffer, K.J., Fox, R.J.,  McGill, C.A. and Koutsabeloulis, N.C. (1995) Novel Techniques Show  Links between Reservoir Flow Directionality, Earth Stress, Fault Structure and Geomechanical Changes in Mature Waterfloods.  presented at the SPE Annual Technical Conference and Exhibition, Dallas, 22-25 October, 1995 (SPE 30711 republished in SPEJ pp 91-98 v2 no 2 June 1997). pdf

 Koutsabeloulis, NC, Heffer, KJ and Wong, SK (1994) “Numerical geomechanics in reservoir engineering” Computer Methods and Advances in Geomechanics: Proceedings of the Eighth International Conference, Morgantown, West Virginia, May 1994, 4 vols. Siriwardane HJ and Zaman MM eds. Balkema, Rotterdam, ISBN 90-5410-380-9 / 9054103809

 Heffer, K J & Koutsabeloulis, N C, (1993) "Fracture Scale Effects in Hydrocarbon Reservoirs" presented at the Second International Workshop on Scale Effects in Rock Masses, Lisbon, Portugal, 25 June 1993, published in "Scale Effects in Rock Masses", Pinto da Cunha (ed.) 1993 Balkema, Rotterdam, ISBN 90 5410 322 1. pdf

 Heffer, K.J., Koutsabeloulis, N.C. & Wong, S.K. (1994) Coupled geomechanical, thermal and fluid flow modelling as an aid to improving waterflood sweep efficiency.  SPE 28082 Eurock '94  1994 Balkema, Rotterdam pdf

 Munthe, K.L., Omre, H., Holden, L , Damsleth, E., Heffer, K.J. Olsen, T., & Watterson, J.(1993) “Subseismic Faults in Reservoir Description and Simulation” SPE 26500 presented at the SPE Annual Technical Conference, Houston, 3-6 October, 1993

Angert,  P.F., Heffer, K.J., Bevan, T.G., Pearce, A.J. (1993) Modeling the Effect of Sub Seismic Faults on Gas Oil Displacements in the Upstructure Region of the Prudhoe Bay Field, Alaska.Society of Petroleum Engineers paper SPE 26646 presented at the SPE Annual Technical Conference and Exhibition, Houston Texas, October 1993.

 Heffer, K.J. & Koutsabeloulis, N.C (1993) Stress Effects on Reservoir Flow - Numerical Modelling Used to Reproduce Field Data. Proceedings of the Seventh European Symposium on Improved Oil Recovery October 27-29, 1993. Published in "New Developments in Improved Oil Recovery", Geological Society Special Publication No 84  ISBN 1-897799-22-5 pdf

 Heffer, K.J. and Lean, J.C. (1993) Earth stress orientation - a control on, and guide to, flooding directionality in a majority of reservoirs.  "Reservoir Characterization III" , edited by Bill Linville, PennWell Books, Tulsa. pdf

Corvi P., Heffer K., King P., Tyson S., Verly G., Ehlig-Economides C., Le Nir I., Ronen S., Schultz P., Corbett P., Lewis J., Pickup G., Ringrose P., Guerillot D., Montadert L., Ravenne C., Haldorsen H., Hewett T. (1992). Reservoir characterization using expert knowledge, data and statistics. Oilfield Review 4(1):25-31. pdf

 Heffer, K.J., Last, N.C., Koutsabeloulis, N.C., Chan, H.C.M., Gutierrez, M., and Makurat, A. (1992).  The influence of natural fractures, faults and earth stresses on reservoir performance - analysis by numerical modelling.  North Sea Oil and Gas Reservoirs I1I, 1994 Kluwer Academic Publishers

 Heffer, K J & Fox, R J , (1992)  "Natural Fractures - Heterogeneities to consider in more than just 'Naturally Fractured' Reservoirs" presented at the conference on "Advances in Reservoir Technology" London, 1-2 October 1992

 Heffer, K. J. & Bevan, T. G.,(1990) "Scaling Relationships in Natural Fractures:  Data, Theory and Applications", Society of Petroleum Engineers paper SPE 20981, presented at the Society of Petroleum Engineers Europec 90  meeting, The Hague, Holland, Oct 1990.

 Heffer, K.J. and Dowokpor, A.B. (1990) Relationship between Azimuths of Flood Anisotropy and Local Earth Stresses in Oil Reservoirs.  North Sea Oil and Gas Reservoirs II, Graham & Trotman. pdf