GeoPressure Domain Experts

Stephen O’Connor

GeoPressure Domain Expert

Stephen O’Connor is a global domain expert for GeoPressure.

He has also been involved in internal knowledge transfer and teaching > 50 external courses including bespoke courses for companies focused on integrating the G&G, asset and drilling teams.
He has been instrumental in developing “Best Practice” workflows and R&D for well planning, mentoring staff and integrating pore pressure with other disciplines such as rock physics and geomechanics.

Click here to see Stephen O’Connor’s references

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.

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

Durham, United Kingdom

Guy Markham

GeoPressure Geologist

Guy Markham is a geologist specialising in geopressure, with over 8 years of worldwide experience across all areas of geopressure services, and has led geopressure teams in project work, and co-authored various regional studies.

He also has operator experience as an exploration geologist for Premier Oil for 7 years.

Guy presented at the GeoPressure 2015 conference at Durham University, and at the Second EAGE Workshop on Pore Pressure Prediction in Amsterdam in May 2019.

York, United Kingdom

Our Technical areas of expertise:

Seal Breach Analysis

Risking of top-seals (dry hole vs discovery analysis).

Hydrodynamic Flow

Identifying the evidence for hydrodynamic flow and lateral drainage and the resulting effects for tilted contacts, migration and reserve estimation.

Derivation of Well Plans

For HP/HT drilling, as well as for sub-salt, deep-water, carbonate and other drilling environments.

Pore Pressure Modelling

Understanding shale and reservoir pore pressures and their common differences. Quantifying the contributions of secondary overpressure. Predicting pore pressure in resource plays.

Frontier Basins

Applying analogues and geological models to reduce uncertainty in wildcat drilling.

Overburden Management

Understanding the overburden in terms of overpressured intervals that could potentially flow.