Testimonials & References


Regional Study

Senior Geologist, Operator

“Thanks again for an excellent workshop last week – I really believe we are a step ahead of the pack in terms of understanding the pressure differences in the various areas in the basin with regard to retention risk.”

Offshore Mexico Exploration Well

Geophysicist, Operator

“Stephen came into our offices for a one day consulting job for pore pressure prediction on an appraisal well. He was very quickly up to speed with the problems we faced and produced the work required on the spot, explaining clearly what he was doing along the way. He helped to influence the operator’s pore pressure prediction through discussions with their subject expert and has made himself available for follow up queries. Overall a very professional job that had a demonstrable impact on our well planning.”

SE Asia Well Plan

Senior Drilling Engineer, Operator

“GGA did a very professional job in producing a useful pore pressure model using limited historical data. Their follow up service was fast and reliable. They gave decisive opinions in the face of uncertainty, a refreshing attitude in today’s litigious environment.”

Ivory Coast Well Plan

Operations Geologist, Operator

“As a consultancy with worldwide experience and a working ethos of integrity and professionalism, Global Geopressure Advice was the first stop in assessing the subsurface pressure environment of our prospect. We progressed into the well planning phase with increased confidence as a result of our collaboration and the result added value through improved understanding.”


Lee, J., Swarbrick, R., E. and O’Connor, S., A. Kicks and their significance in pore pressure prediction. Geol. Soc. Spec. Pub (in press)

Oughton, R. A., Wooff, D., A. and O’Connor, S., A. Sequential dynamic Bayesian network for pore pressure estimation with uncertainty quantification. Geophysics (in press)

Green, S., O’Connor, S., A. and Edwards, A., E. 2016. The influence of pore pressure in assessing hydrocarbon prospectivity: a review. First Break volume 34 (May) p 40-46.

Hoskin, E and O’Connor, S.A. 2016. The Influence of Rock Properties on Velocity Data with Respect to Pressure Prediction—with Particular Focus on Seismic Velocity Data. Journal of Earth Sciences 2 p19-34 ISSN 2372-5176. 

Moore, C., Doyle, E., Jewula, K., Karda, L ., Sheehy, T. O’Connor, S., A. and Djordjevic, O. 2016. Real-time Monitoring, Using All Available Data, Plays A Vital Role In Successful Drilling Operations. OTC- 27145-MS

Edwards, A., E and O’Connor, S., A 2015 Regional GeoPressure studies — their impact from prospect identification and risking through the life cycle of a field to production and development. The Leading Edge (December) p. 1502-1508.

Green, S., O’Connor, S.,A., Cameron, D.E.L., Carter J.E., Goodman, W., Heinemann, N, and Edwards, A.P 2015. Producing pore pressure profiles based on theoretical models in undrilled, deep-water frontier basins. Interpretation, Vol. 3, No. 1 (February 2015); p. 13–32.

Heller, J., O’Connor, S., A., Emery, A., Hoskin, E., Lee, J and Ward, C. 2015 Effect of unconformities and subsequent loading on pore pressure profiles Proceedings, Indonesian Petroleum Association Thirty-Ninth Annual Convention & Exhibition

Hoskin, E, O’Connor, S., A., Robertson, S., Streit, J., Ward, C., Lee, J., and D. Flett. 2015 Influence of faulting on reservoir overpressure distribution in the Northern Carnarvon Basin. APPEA

Heller., J, Basuki, D., Choo, M., O ‘Connor, S and Swarbrick, R.E. 2014 Using simple loading models to predict crestal pore pressures in Miocene carbonate exploration targets, Luconia, Sarawak. Proceedings, of Indonesian Petroleum Association Annual Convention & Exhibition, May 2014

O’Connor, S., Mildren, S., Kemper, M., Malaver, C., Gallop J and Green, S 2014 Optimizing resource plays – an integrated “GeoPrediction” approach. CSEG RECORDER | Oct 2014 | VOL. 39 No. 08

O’Connor, S A, Green, S and Edwards, A, E. 2014 What is the impact of GeoPressure on unconventional plays? First Break v.32 Feb Unconventionals and Carbon Capture and Storage

Oughton, R. A., Wooff, D. A. and O’Connor, S.A. 2014. A Bayesian shifting method for uncertainty in the gamma ray log around casing points. Petroleum Geoscience

O’Connor, S.A., Swarbrick, R.E., Lahann, R, Edwards, A., Scott, D and Green, S. 2013 The determination of seal capacities for highly pressured HP/HT traps: a “best-practice” workflow. In: Proceedings of Indonesia Petroleum Association Conference, Jakarta.

Jenkins, S, Swarbrick, R, Mallon, A and O’Connor S, A. 2012 Pressure in Miocene Carbonate Exploration Targets In: Proceedings of Petroleum Association Conference, Jakarta.

O’Connor, S., A., Hoesni, J., Swarbrick, R.E and Lahann, R. 2011. Pore fluid pressure prediction in challenging areas, Malay Basin. Proceedings of Indonesian Petroleum Association Annual Convention & Exhibition, Jakarta

O’Connor, S., A., Rasmussen, H., Swarbrick, R., E. and Wood, J. 2011. Integrating a hydrodynamically-tilted OWC and salt-withdrawal depositional model to explore the Ula Trend. GeoFluids v.11, p. 388-400.

O’Connor, S., A., Swarbrick, R., E. and Lahann, R. 2011. Geologically-driven pore fluid pressure models and their implications for petroleum exploration. Introduction to thematic set. GeoFluids v.11, p.343-348.

Swarbrick, R., E., O’Connor, S.A. & Lahann, R.W. 2011. The occurrence and prediction of high pressure sediments along the West African Margin. Leading Edge v.30, no.6, p.682-687.

Webster, M., O’Connor, S., A., Pindar, B. and Swarbrick, R.E. 2011. Overpressures in the Taranaki Basin: Distribution, Causes and Implication for Exploration. AAPG Bulletin, v.95, p.339-370

Swarbrick, R.E., Lahann, R.W., O’Connor, S.A. and Mallon, A.J. 2010. The role of the Chalk in development of deep overpressure in the Central North Sea. In: Vining, B.A. & Pickering, S.C. (eds.) Petroleum Geology: From Mature Basins to New Frontiers, Proceedings of 7th Petroleum Geology Conference, v.1. p.493-507.

Jones, D., O’Connor, S., A. and Swarbrick, R., E. 2008 Where has all the pressure gone?  The evidence from pressure reversals and hydrodynamic flow. First Break Volume 26 September 2008

O’Connor, S.A. and Swarbrick, R.E. 2008. Pressure Regression, Fluid Drainage and a hydrodynamically-controlled fluid contact in the North Sea, Lower Cretaceous, Britannia Sandstone Formation. Petroleum Geoscience V. 14 p. 1-14