TGS GPS- Post Well Analysis - mid Norway

1. © 2017 TGS-NOPEC Geophysical Company ASA. All rights reserved.
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Post Well Analysis (PWA)
MID NORWAY
Exploration successes occur when all the following prerequisites are
fulfilled:
ƒƒ Presence of effective RESERVOIR
ƒƒ Presence of effective SEAL (top, fault and lateral seals)
ƒƒ Presence of TRAP prior to hydrocarbon charge (structural and or
stratigraphic)
ƒƒ Hydrocarbon CHARGE (generation/migration)
By analyzing the reasons for success and failure we can learn more
about the hydrocarbon system in which the well was drilled, and
improve the chances of success in the future. TGS is reviewing the
most representative exploration wells (preliminary 80) drilled to test
independent prospects in the Norwegian Sea. All prospective levels in
each well will be investigated irrespective of the primary target of the well.
Well Data
The preliminary 80 wells have been chosen as the most representative
exploration wells based on location, quality of data and exploration
interest. The well list covers the Halten Terrace and other prospective
areas to give good coverage of the Norwegian Sea.
The following data sources provide input to the analysis:
ƒƒ Norwegian Petroleum Directorate (NPD) website
ƒƒ Original composite logs, well reports, etc.
ƒƒ TGS’ Mid Norway Facies Map Browser (including litho-/
chronostratigraphy)
ƒƒ TGS’ petrophysical database (CPI)
ƒƒ Geochemical and well pressure data
Seismic Data
For the evaluation of geometric properties of traps and for maturation
modelling of drainage areas, a regular regional grid of 2D data has been
utilized. This seismic grid consists mainly of the MNR long offset data
(approx. 180,000 km). Furthermore, public data (2D and 3D) will also be
used where appropriate.

2. © 2017 TGS-NOPEC Geophysical Company ASA. All rights reserved.
Deliverables
The Mid Norway Post Well Analysis (MN PWA) is a new GIS-based
exploration aid. It is designed to analyze and explore the full range
of factors influencing the presence/quality of trap, reservoir, seal and
hydrocarbon charge (including retention) for all prospective levels in all
tested structures.
The project addresses 80 released exploration wells by extracting
parameter subsets from all prospective intervals.
Data recorded includes:
1. General well information
2. Reservoirs
ƒƒ Lithological, stratigraphic and facies features
ƒƒ Petrophysical parameters (N/G, av. poroperms)
3. Traps
ƒƒ Type, closure, faults and effectiveness
ƒƒ Timing of emplacement, modification, exhumation, DHI
4. Seals
ƒƒ Top seal; lithological, stratigraphic and facies features
ƒƒ Bottom seal, critical seal, waste and thief zones
5. Hydrocarbons
ƒƒ Type and features of HC columns and/or shows
ƒƒ Retention
6. Charges
ƒƒ Lithological, stratigraphic and facies features
ƒƒ Quality of source in well including average TOC and HI, max
maturity, max and present day temperature, age of expulsion
ƒƒ Quality of source in the kitchen
ƒƒ Migration
Data Viewer
The database will be delivered as an ESRI ArcGIS Geodatabase, in
Access®
or binary format, containing all spatial data and spatial
analysis using data types supported by ArcGIS software.
TGS is also seeking to develop a Facies Map Browser (FMB) PWA plug-in,
so the PWA can be viewed and queried within the FMB regional geological
interpretation tool without the need for a separate ArcGIS license.
Query Tool
The PWA will include a query toolbar to enable graphical representation
of regional and localized query results. There are multiple queries and
these will include:
ƒƒ Reservoir presence, effectiveness and fluids
ƒƒ Trap type, effectiveness and retention failure
ƒƒ Top seal and critical seal
ƒƒ Charge rating (up to 5 charges per reservoir)
ƒƒ Main failure mechanism
Images
The database will include images of the following:
ƒƒ A pie chart scheme that summarizes the results of each well (PDF)
ƒƒ Lithostratigraphy and wireline data for each well (JPG)
ƒƒ One image minimum of a representative seismic line for each
well (PDF)
ƒƒ One grid map minimum for a representative horizon for each
well (PDF)
Benefits
ƒƒ Complete well parameter interpretation in a single location
saves time
ƒƒ Access to collated learning from well failures and successes
facilitates new analytical approaches (within the GIS-environment)
and reduces future risk of drilling dry holes
ƒƒ Graphical display of queries for reservoir, seal, trap and charge
improves understanding of petroleum systems
For more information, contact TGS at:
UK
Tel: +44 208 339 4200
Email: EUSales@tgs.com
See the energy at TGS.com
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