Job Description
About the Job
Stag Geological Services is established as the leading subsurface consultancy for Plug and Abandonment (P&A) of legacy oil and gas wells, Carbon Capture and Storage Re-use (CCSR) of legacy oil and gas fields, and Geothermal well design and delivery. With exponential growth across all our services in 2024, we now wish to appoint a Senior Geologist to join our team of specialists delivering a global portfolio of project work for clients engaged in energy transition activities across Europe, Australia, Africa and the Middle East.
Your initial work focus will be on a number of high-profile P&A and CCSR projects in the Central and Southern North Sea, building and supporting well and multi-well Subsurface Basis of Designs (SsBoD) using workflows within our industry-leading, multi-platform Geological Engineering Model (GEM) environment as well as delivering additional project services for subsurface characterisation. You will engage from the outset with operator clients ranging from supermajors to small independents, and collaborate with teams of specialist engineers from multiple partnered well management and drilling engineering companies.
Working with us, you will develop and deploy a unique, multidisciplinary skill set to deliver work across an exceptional range of geological and engineering challenges at the cutting edge of the energy transition. You will deepen existing and develop new skills in stratigraphy, petrophysics, geophysics, pore and fracture gradients, fluid pressures and mobilities, fault and fracture mechanics, wellbore stability, and drilling and logging practices.
Stag anticipates that applicants for this role will be willing and able to rapidly widen from a strong base of experience in development geology, project geology, exploration geology, geophysics or geomechanics and we anticipate appointment at a Senior level. Appropriate training for further development and familiarisation with our workflows will be given by specialists within our team.
Role and Responsibilities
As a Senior Geologist, you will:
* Generate and review high-resolution sequence, chrono- and lithostratigraphies within wells, fields and sub-basins of the North Sea.
* Evaluate well and offset well data and construct rigorous lithology, well log and property models of the overburden in wells or areas where direct measurements do not exist.
* Construct 1-D Pore Pressure and Fracture Gradient (PPFG) models based on such datasets and using industry standard methods (effective stress and/or Mechanical Earth Modelling techniques).
* Evaluate and estimate permeability, fluid pressure, fluid type and flow potential within the reservoir and overburden sections of wells.
* Evaluate test data (laboratory and well integrity tests) to understand poroelastic rock properties, rock strength, and the neotectonic Andersonian fault regime (normal, strike slip or reverse faulting) present in the earth’s crust.
* Construct well stability models (collapse gradient) with reference to qualitative or quantitative models of maximum horizontal strength and/or historic wellbore instability events.
* Construct fault and fracture models in order to support both well integrity for abandonment (fracture transmissibility, fault shear reactivation, breakdown and far field flow) and geothermal (hydroshear) objectives.
* Construct zonation schemes for well abandonment which resolve the range of risked barrier construction opportunities within a well, and communicate these opportunities to specialist operational engineering teams within partner companies and operators.
* Build, maintain and develop three-dimensional static models in Schlumberger’s Petrel software. Such models may be used to illustrate or directly evaluate the consequences and risks of lateral fluid flow away from the wellbore when multiple zones of flow potential are isolated from surface beneath a common barrier constructed in a well or within multiple wells in a contiguous group, or they may be used to evaluate pressure and stress changes in reservoirs and aquifers in consequence of CCSR activity.
* Evaluate, describe and quantify dynamic changes in pressure and flow potential arising from changes in pressure support, depletion, and recharge in wells and fields arising on timescales ranging from present production, cessation of production (CoP) and post-CoP to the infinite geological future. This work may include modelling pressure, stress and fluid changes over time (4D) in reservoirs and aquifers in consequence of carbon dioxide injection and/or pressure drawdown via brine relief.
* Write and deliver reports and other presentational materials concisely and with clarity.
* Present and communicate, as part of Stag’s specialist team, these results to operators and partners, engage in stage gate and review meetings and activity, and attend and present as appropriate and as required at scholarly meetings and conferences (e.g. SPE) as a representative of Stag and of our clients and partners.
Competencies
You will demonstrate:
* Fluent written and spoken English.
* Education to MSc level in geology or a cognate subject.
* Excellent interpersonal skills working within a small and specialist team.
* A history of and commitment to innovative thinking and the development of novel and robust technical solutions.
* An ability to work quickly and precisely to meet short client deadlines.
* Clarity and economy of communication.
* At least five years’ experience in relevant roles (project geology, exploration geology, development geology, geomechanics, geophysics etc) with relevant employers (e.g. O&G operator, geothermal operator, or relevant third parties).
* A comprehensive understanding of clastic sedimentology with an evidenced track record in the evaluation and description of depositional architectures and relationships using stratigraphic methods.
* Strong familiarity with the stratigraphy and lithofacies of reservoirs and overburden rocks in either the Central or Southern North Sea.
* A strong understanding of one or more of the following: pore and fracture pressure modelling, including mechanical earth models; wellbore stability and the means by which failure criteria (Uniaxial Compressive Strength, Failure Angle/Coefficient) are resolved from well logs and calibrated to test data; fault and fracture dynamics, including mapping of faults in 3D seismic; preparation of static models, including property modelling; reservoir simulation and the preparation of dynamic models, ideally including CO2 sequestration workscope; geophysics, including preparation of seismic volumes, time-depth conversions and general interpretive work; petrophysics, including porosity and saturation estimation ideally with knowledge of methods for the log derivation of brine salinity (Pickett and/or Hingle methods).
* Strong and evidenced familiarity with Schlumberger’s Petrel platform, at least covering loading, processing and conditioning of well data, display of well logs, interpretation and correlation; ideally including seismic interpretation and workflows for the construction of static models in Petrel.
In addition, the following will be advantageous:
* A PhD in stratigraphy/sedimentology, geomechanics, or geophysics.
* Operational experience of drilling units gained as a mudlogger, drilling engineer, wellsite or operations geologist.
* Previous experience of well planning support.
* Previous experience of subsurface or engineering support for well P&A planning activity.
* Basic familiarity with Geologix GEO Suite.
Employment Type: Permanent
Location: This is a full time position and the successful candidate will be based in the U.K. at either our Head Office in Aldermaston or at our office in Aberdeen. Hybrid working will be considered.
You must have the right to live and work in the U.K. to be considered for this role.
Please only apply if you are suitably skilled and located. Please read the full details before applying.
About Stag
Stag Geological Services was established in 1995 and is a leading provider of well operational and decommissioning services worldwide. For more information, please see our website at www.stag-geological.com.