Education

B.Sc. (Hons) Geology, London University, 1971-1974

 

Key Technical Expertise

 

·       Over 28 years experience as an interpretation geophysicist and geoscience project leader.  I have recent working experience with North Sea operators and have a practical understanding of the up-to-date seismic and interpretation technologies.

·       Project experience with the latest visualization, voxel based, interpretation software, especially Voxelgeo.  Landmark workstation expert user plus GeoQuest Charisma and IESX under GeoFrame.

·       Considerable experience in computer mapping, mostly CPS3 with some Zycor.

·       Specialist depth conversion experience, VELIT depth conversion software user, analysis using spreadsheets.

·       Equity determination experience both as Independent Expert and as Oil Company Geophysical Committee representative.

·       Well to seismic ties, synthetic seismogram generation, Syntool user.

·       Seismic processing supervisor, testing and data enhancement.

·       Past lecturer for Oxford Brookes University’s Petroleum Geology M.Sc. course.  Experienced seismic workstation instructor.

 

1999-present    Independent Consultant Geophysicist – Stuart Fletcher Ltd

 

Clients:

Shell UK Equity Group Shell Expro HPHT Team

Ø     Technical Due Diligence and Acreage evaluation; Cambay Basin, India and Deep Water Nile Delta, Egypt, providing the client with an independent risked assessment of STOOIP and GIIP for proven developments, drilled prospects and exploration leads.

 

Ø     Prospect mapping and maturation up to recommendation accepted for drilling around the HTHP fields of Shearwater and Elgin-Franklin and the very deep grabens eastwards of the J-Ridge. Depositional uncertainties of the Middle Jurassic reservoir still cloud the development of Kessog while the adjacent Jade field, with its Triassic reservoir, is a success.  Greatest risk still lies with structural uncertainty caused by difficulty in mapping the Permian salt layer, and understanding its affect on Triassic and Jurassic deposition.  A simple 2D gravity modelling study allowed the Top Salt to be mapped with more confidence mitigating some of these problems.

 

Ø     Seismic mapping and regional compilation for Pre-stack Depth Migration velocity modelling.  10 overlapping 3D surveys were interpreted and the horizons were combined to give highly accurate, wavelet hugging, regional horizons suitable for velocity estimation via seismic tomography. 

The work:

1)     provided a valuable database for other project geophysicists, helping to unify otherwise separate interpretation studies.

2)     considerably reduced the time taken to work other detailed prospect mapping because the accuracy of the regional mapping meant that shallow horizons needed for layer-cake depth conversion, for example, were already complete.

 

Ø     Depth conversion study as a part of a Southern North Sea Equity Determination involving a detailed study of the effects of the overburden’s velocity variations and the design of an appropriate depth conversion methodology.  The study allowed the client to enter partner negotiations with a risked assessment of the equity split.

 

Previous Professional Experience

 

1995 - 1999       Principal Geophysical Consultant - Geoquest Reservoir Technologies

(formerly Intera Information Technologies)

Proprietary seismic mapping, depth conversion and basin reconstruction of the UK’s Northern North Sea concentrating on the largely untested Triassic stratigraphy.  Success of the Alwyn Triassic reservoir led to an increase of interest in the deeper Triassic reservoirs, also tested with

 some success by some of the predominantly Brent reservoir fields.  This study established the main fault network and basin development of the Triassic times.

 

Proprietary seismic interpretation and play generation in the Hewett area of the UK’s Southern Gas Basin.  Besides undrilled “hanging wall” plays in the Rotliegend, the Lower Cretaceous sands still represent an interesting target.

 

Proprietary geophysical interpretation and mapping leading to discovery of the Jocelyn Gas Field, UK Block 30/7.  With a very short lead-in time a 3D survey was interpreted, a drilling location agreed with the licence partners and the satellite discovery was drilled from the production template.

 

Geophysical specialist for reserves auditing, Middle East and South Africa, Bredasdorp Basin.

 

1992 - 1995       Head of Geophysics - Intera Information Technologies

(formerly ECL Technologies Group)

Project Manager and Principal Geophysicist for a 10-man Expert Team covering the UK Nelson Field Equity Determination, conducted under the Guided Owners process.  The geophysical component involved 3D interpretation and depth conversion of the Tertiary deep sea fan reservoir as well as providing support for property mapping of the Forties reservoir units.  The key problem here, for understanding the gross rock volume of the structure is the seismic time pull-up caused by the overlying, channelised Eocene sands.

Data gathering for non-proprietary Data Packages of Sakhalin Island and East Siberia.

 

1980 - 1992       Senior Geophysicist - Exploration Consultants Limited (ECL)

Various studies including proprietary seismic interpretation, open seismic interpretation, basin analysis studies and farm-in evaluations.  Areas worked included Western Europe’s continental shelf, the former Yugoslavia (Bosnia and Croatia), West Africa and the Caribbean.

 

1977 – 1980      Processing "Party Chief" - Geophysical Services International (GSI)

Working in GSI's Bedford centre with extensive experience in 3D velocity interpretation and F-K processing.  Areas worked included North Sea, West Africa and Moray Firth.  Marine data acquisition experience in offshore Gabon.  Responsibility for parameter testing and test lines, and complete processing projects.

 

1974 – 1977      Seismic Interpreter - V.C. Illing and Partners, Geological Consultants

Seismic Interpreter evaluating marine and land prospects.  Leader and quality control supervisor of land/marsh gravity crews in the UK.

 

 

Teaching

 

1999-2001        

Preparation and delivery of the Seismic Interpretation lectures for Oxford Brookes University’s Petroleum Geology M.Sc. course.

 

Professional Affiliations

 

Member European Association of Petroleum Geoscientists

Associate Member Society of Exploration Geophysicists

Member Petroleum Exploration Society of Great Britain

 

 

Most Recent Professional Training

 

Earthmoves Ltd. Salt Tectonics Course

Dr M Al-Chalabi: Seismic Velocities and Depth Conversion

EAEG: The Seismic Velocity Model as an Interpretation Tool

GeoFrame 3.5, Fundamentals, Project Management and Data Loading

 

 

References

 

The following can be contacted at any time.

 

Bettina Bachmann, Manager, HPHT Central Graben Group, Shell Exploration and Production Ltd,

1, Altens Farm Road, Aberdeen AB12 3FY: 01224 882000

 

John Mabillard, Chief Geoscientist, Shell UK Ltd, 1, Altens Farm Road, Aberdeen AB12 3FY:

01224 882000

 

 

Full Contact Details

 

Stuart Fletcher

Stuart Fletcher Ltd

Little Hill                                                                        Telephone:        +44 (0)7867 557534

Blind Lane                                                                                             +44 (0)1628 529296

Bourne End                                                                   E-mail:              smfletcher@csi.com

Bucks SL8 5TN                                                             Website:           www.smfletcher.com

 

 

 

 

Supplementary Information:

 

Below are some details of the projects I have worked on between 1982-1995.  I have placed them in area order rather than time.

 

Anglo Netherlands and German Gas basin

·              Project Leader for detailed block evaluation for licence application for Netherlands offshore blocks, F quadrant.  This work lead to Statoil Netherlands’ discovery of the F18 oilfield.  This was a classic case of the first well being drilled off structural closure for the reservoir.  Closer detail to the stratigraphic significance of the reflectors, based on regional knowledge and a depth conversion strategy that was tied to a significant number of nearby wells led to the discovery of a 60 MMB oilfield with a second well on the structure.

·                     Taaken Rotenburg Gas Field, onshore Germany.  Detailed 3D interpretation, depth conversion through complex salt layer and reservoir characterisation using seismic attributes.  The porosity of the Rotliegende reservoir was predicted from a normalised amplitude map of the Top Rotliegende reflector.

·              Proprietary depth conversion sensitivity study Onshore Netherlands.

·              Project Leader for interpretation of 4,500 km ECL non-exclusive data in the UK Southern Gas Basin.  Supervision and co-ordination of a team of 5 technical staff.  The chief success of this work was the development of a regionally consistent method of depth conversion through the Permian and younger rocks allowing for the Cretaceous and Lower Tertiary tectonic uplift.

 

Norway

·              Block 30/8 (due west of Oseberg Field): Prospect definition for licence application.

·              Nordland II, offshore Norway: Regional and detailed seismic study and basin analysis.

 

UKCS

·              Detailed interpretation of quadrant 211, specifically around the Eider Field.

·              Farm-in evaluation of Block 211/1 (north of the Magnus Basin).

·              Project leader for basin analysis study and hydrocarbon evaluation of the West Hebrides continental shelf for publication as a non-exclusive report.

·              Block evaluation and supervision of processing for Northern Ireland, Rathlin Island acreage.

 

West and East Africa

·              Interpretation of Gabon offshore seismic data including both the pre-salt plays of the south and the post-salt plays of the northern area.

·              Angola: seismic interpretation and basin analysis.

·              Namibia: Detailed interpretation of the Kudu Field.  Interpretation and processing supervisor of ECL’s non-proprietary seismic survey.

·              Offshore Mozambique basin analysis as part of a World Bank funded study.

·              Guinea Bissau.  Regional 2D seismic mapping tied to a detailed 3D interpretation of data that were acquired and processed during the project.  Sequence stratigraphic seismic mapping, depth conversion and gravity modeling formed part of a multi-disciplinary approach to solving the problem of hydrocarbon maturity and expulsion timing.

 

Central Europe

·              Croatia and Bosnia: Prospect generation within Tertiary fluvio-deltaic systems of the Pannonian Basin, and seismic interpretation and processing supervisor for the Sarajevo based Energoinvest.  This work was part of a World Bank funded study.

 

Central America

·              Bahamas, British Virgin Islands, Grenada:  Basin analysis and prospect generation for a World Bank funded non-proprietary report.

 

Far East

·              Philippines: proprietary seismic interpretation for TOTAL on their operated acreage.

·              Irian Jaya : proprietary basin evaluation for the Korean Petroleum Development Corporation.