North Sea Central GrabenPressure Study Phase 2

Using maps and seismic to solve the seal breach challenge for HPHT prospectivity and updating the regional overpressure mapping linked to fluid flow in the Central North Sea.

IHS, GeoPressure Technology Ltd and PGS have collaborated to produce a study that incorporates 300 new wells and, for the first time, seismic data from the PGS MegaSurvey to create a powerful risking tool for future HPHT exploration. Hydraulic seal capacity has been assessed using both well and crestal data to create a risking strategy at Top Jurassic Reservoir, Base Cretaceous Unconformity (BCU) and Base Chalk horizons. These results have been subsequently coupled with interpretation of key surfaces from the MegaSurvey to create a set of risking maps tied to overpressure compartments of trap integrity, leak points and potential protected traps across the Central North Sea HPHT region. In addition all the maps created for the successful GPT/IHS Pressure Study completed in 2003 have been updated.

Regional mapping and understanding of overpressure gradients at Post-Palaeocene, Palaeocene, Cretaceous, and Jurassic stratigraphic levels establishes evidence for laterally drained reservoirs with potential influence on fluid flow and petroleum migration.

DATA SET:

This study integrates data from over 1550 wells, covering:

‒ UK Quads 15, 16, 20, 21, 22, 23, 28, 29, 30, 31, 38 & 39

‒ Norwegian Quads 1, 2, 3, 6, 7, 15 & 16

‒ Danish Quads 5503, 5504, 5603 & 5604

Copyright © 2019 IHS Markit. All Rights Reserved

customer care north and south america T +1 800 447 2273

+1 303 858 6187 (Outside US/Canada)

europe, middle east and africaT +44 1344 328 300

asia pacificT +604 291 3600

E CustomerCare@ihsmarkit.com

About IHS MarkitIHS Markit (NYSE: INFO) is a world leader in critical information, analytics and solutions for the major industries and markets that drive economies worldwide. The company delivers next-generation information, analytics and solutions to customers in business, finance and government, improving their operational efficiency and providing deep insights that lead to well-informed, confident decisions. IHS Markit has more than 50,000 key business and government customers, including 80 percent of the Fortune Global 500 and the world’s leading financial institutions. Headquartered in London, IHS Markit is committed to sustainable, profitable growth.

For more information www.ihsmarkit.com/pressure

378757204-0719-JL

The study offers the following key elements:

‒ Overpressure distribution maps for the 7 main reservoir horizons

‒ Re-assessment of pressure data from Palaeocene reservoirs, correlated to depositional units

‒ Recognition of gradient overpressure linking hydrodynamic aquifers and examining intra-fan vertical connectivity issues

‒ Revised pressure compartment map for Jurassic and Triassic intervals, integrating structural interpretations using the PGS MegaSurvey seismic data

‒ Effective stress maps highlighting trap integrity risk and identifying leak points and potential protected traps

‒ Seismic attribute data to identify the location of vertical fluid flow and leakage above traps and faults

‒ Predictive algorithms for calculating lithostatic and fracture pressure gradients

The study is based on contemporary theories of seal breach risk and utilises the highest quality data, making it both authoritative and comprehensive.

Companies will be able to:

‒ Calibrate in-house pressure models

‒ Understand effectiveness of vertical and lateral seals in the Central North Sea,

‒ Understand and define drilling windows for HP/HT targets,

‒ Identify new exploration opportunities via identification of overpressure gradients affecting migration and fluid flow.

The Pressure Study of the Central Graben is available hard-bound in A4 format (with enclosures) and a CD containing GIS ArcView files of overpressure data is also included.

A presentation of the summary and conclusions will also be made available on CD.

GeoPressure Technology is an Ikon Science company

551155115511551155115511551155115511550955095509550955095509550955095509551055105510551055105510551055105510

551255125512551255125512551255125512

551455145514551455145514551455145514

541454145414541454145414541454145414

551555155515551555155515551555155515

541254125412541254125412541254125412540954095409540954095409540954095409

541054105410541054105410541054105410 541154115411541154115411541154115411

560856085608560856085608560856085608

570757075707570757075707570757075707

560656065606560656065606560656065606 560756075607560756075607560756075607

570857085708570857085708570857085708

560956095609560956095609560956095609561056105610561056105610561056105610 561156115611561156115611561156115611

561256125612561256125612561256125612

023023023023023023023023023

022022022022022022022022022

012012012012012012012012012013013013013013013013013013 014014014014014014014014014 571057105710571057105710571057105710570957095709570957095709570957095709

571157115711571157115711571157115711

550555055505550555055505550555055505 550655065506550655065506550655065506

JJJJJJJJJ

550755075507550755075507550755075507

KKKKKKKKK

550855085508550855085508550855085508

FFFFFFFFF

020020020020020020020020020

009009009009009009009009009

019019019019019019019019019

010010010010010010010010010 011011011011011011011011011

560356035603560356035603560356035603

560456045604560456045604560456045604

003003003003003003003003003

560556055605560556055605560556055605

004004004004004004004004004

016016016016016016016016016

007007007007007007007007007 008008008008008008008008008

018018018018018018018018018017017017017017017017017017

002002002002002002002002002

029029029029029029029029029030030030030030030030030030

023023023023023023023023023

001001001001001001001001001

007007007007007007007007007

006006006006006006006006006

025025025025025025025025025 026026026026026026026026026 027027027027027027027027027

009009009009009009009009009

008008008008008008008008008

024024024024024024024024024

021021021021021021021021021020020020020020020020020020

015015015015015015015015015016016016016016016016016016

014014014014014014014014014

015015015015015015015015015

022022022022022022022022022

027027027027027027027027027028028028028028028028028028

036036036036036036036036036

025025025025025025025025025

026026026026026026026026026

012012012012012012012012012

201201201201201201201201201

011011011011011011011011011

017017017017017017017017017018018018018018018018018018

013013013013013013013013013

019019019019019019019019019

203203203203203203203203203

202202202202202202202202202

166166166166166166166166166

005005005005005005005005005

HHHHHHHHH

DDDDDDDDD

EEEEEEEEE

GGGGGGGGG

FFFFFFFFF GGGGGGGGG

CCCCCCCCC

550455045504550455045504550455045504

039039039039039039039039039

031031031031031031031031031

550355035503550355035503550355035503

AAAAAAAAA

AAAAAAAAA

BBBBBBBBB

BBBBBBBBB

044044044044044044044044044

DDDDDDDDD

EEEEEEEEE

038038038038038038038038038

047047047

042042042042042042042042042043043043043043043043043043

037037037037037037037037037

034034034034034034034034034

040040040040040040040040040

035035035035035035035035035

041041041041041041041041041

111111111111111111111111111

126126126126126126126126126

108108108108108108108108108

112112112112112112112112112

109109109109109109109109109

110110110110110110110110110

113113113113113113113113113

156156156156156156156156156

154154154154154154154154154

155155155155155155155155155

North Sea Central Graben Phase 2 Study Area

Example of integrated well and seismic data to examine relationships between pressure cell boundaries, crest and well locations and seal-reservoir positions. Example shown from the northern part of the study area. PGS image.