TGS NSA- GOM Post Well Analysis (PWA)

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© 2016 TGS-NOPEC Geophysical Company ASA. All rights reserved.
Lund
Henderson
Lloyd Ridge
Destin Dome
Atwater Valley
De Soto Canyon
Keathley CanyonAlaminos Canyon
Florida Plain
Galveston
High Island
Vermilion
Lund South
Port Isabel
Pensacola
Ship Shoal
Amery Terrace
Brazos Area
Eugene Island
Mobile
West Cameron
East Cameron
Mustang Island
Main Pass
Viosca Knoll
South Timbalier
Viosca Knoll
Sigsbee Escarpment
Matagorda Island
Corpus Christi
Ewing Bank
West Delta
Grand Isle
High Island
South Addition
West Cameron
South Addition
sland
uth Padre Island
High Island
E. Add, S. Ext
Galveston
South Addition
West Cameron
West Addition
Main Pass
S. & E. Addition
Mustang Island
East Addition
Vermilion
South Addition
South Pass
Ship Shoal
South Addition
East Cameron
South Addition Eugene Island
South Addition
North Padre Island
East Addition
High Island
East Addition
Breton Sound
South Padre Island
East Addition
Brazos
South Addition
South Marsh Island
South Timbalier
South Addition
Chandeleur
South Marsh Island
South Addition
South Pelto
South Marsh Island
North Addition
West Delta
South Addition
Port Isabel
TEXAS
LOUISIANA
MISSISSIPPI
ALABAMA
FLORIDA
87°W88°W89°W90°W91°W92°W93°W94°W95°W96°W97°W
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TGS-NOPEC assumes no liability or responsibility for reliance placed thereon.
GULF OF MEXICO
MULTI-CLIENT 3D PROJECTS
N:PublicGISArc Map DocumentsGoMWorks_In_ProgressFeliciaBGOM_PWA_7Mar2016.mxd March 07, 2016
Projection: WGS 1984 UTM Zone 15N
0 10 20 30 405
Miles
TGS PWA Wells
Post Well Analysis (PWA)
USA Gulf of Mexico
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)
ƒƒ Hydrocarbon RETENTION after formation of trap
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 has reviewed historical well/drilling activity in the GOM to identify an estimated 100 key exploratory, discovery and
stratigraphic wells. These wells will be used to create the baseline PWA that will be updated annually with 20-40 new exploratory data points.
The extent of this study and annual updates is to cover wells from onshore to the deep water and provide analysis of the petroleum systems
relationships. Additional investigations in Field areas provide both producing wells and offsetting lead wells to incorporate relevant validation of the
analysis. Focus of the PWA is towards emerging lower Miocene and Mesozoic reservoirs while providing a comprehensive data base of different play
types within the region. All prospective levels in each well are investigated irrespective of the primary target of the well.

2. © 2016 TGS-NOPEC Geophysical Company ASA. All rights reserved.
Well and Seismic Data
The following data sources provide input to the analysis:
ƒƒ TGS LAS+ composite logs, well reports, etc.
ƒƒ TGS and BOEM paleo analysis to provide litho-/
chronostratigraphy
ƒƒ TGS petrophysical database (CPI)
ƒƒ General Production data from TGS Longbow well performance
application
ƒƒ Geochemical and well pressure data
ƒƒ Hazard identification from well reports as available
ƒƒ Support Data from public domain sources
For the evaluation of geometric properties and certain reservoir
consideration of traps and for modelling of drainage areas and play
types, we will utilize TGS expansive regular regional grid of 2D data
and support with modern day 3D as available. Where accessible,
TGS interpretations will be provided in context to publicly available
references.
Deliverables
The Gulf of Mexico Post Well Analysis (GOM PWA) is a new GIS-based
exploration/field analogue 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 tested features.
Data captured and presented within the product includes both seismic
and well analysis of the following:
1. General well / seismic information
2. Reservoirs
ƒƒ Lithological, stratigraphic and facies features
ƒƒ Petrophysical parameters (N/G, av. poroperm, sand counts,
sand volume, resistivity – porosity cross plot)
3. Traps
ƒƒ Type (eg pre salt, post salt, salt flank), 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 temp, age of expulsion
ƒƒ Quality of source in the kitchen
ƒƒ Migration
Data Viewer
The database is 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.
The database also includes 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 At least one image of a representative seismic line for each
well (PDF)
ƒƒ At least one grid map for a representative horizon for each
well (PDF)
Benefits Include
ƒƒ Time saving - by having the complete well parameter
interpretation in a single location.
ƒƒ Access to collated learning from well failures and successes
to facilitate new analytical approaches (within the GIS-
environment) to reduce the risk of drilling dry holes in the
future.
ƒƒ Key Analogues database and information
ƒƒ Improved understanding of seismic expression and potential
pitfalls (risk reduction tool)
For more information, contact TGS at:
US
Tel: +1 713 860 2100
Email: gps-sales@tgs.com
*ACCESS®
IS A REGISTERED TRADEMARK OF MICROSOFT CORPORATION IN THE UNITED
STATES AND/OR OTHER COUNTRIES
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