Workflow from raw data to Geospatial Data and what its going to be used for

Why we do this?

•  all data we deal with is geospatial •  need more robust key data query and decision support tools for our interpreters in Exploration •  exploration works hard to increase GIS competence within their departments •  still lack of Geospatial analysts within Exploration in general

Stig-Arne Kristoffersen, July 25th 2011

Geospatial Exploration Performance Analysis

EXPLORATION SPATIAL ANALYSES (ESA) WITHIN

EXPLORATION ENVIRONMENT

All exploration related attributes that can be plotted and illustrated on a map, in any combination and complexity, here are some few examples for illustration purposes only.

1.  Where do I find all Brent Fm with larger than 20% porosity? 2.  Where are all Heather Fm penetrations with shows in them? 3.  Give me all Dunlin Fm well penetrations with porosity trends plotted, both in graph and map,

please….. 4.  Plot mean risked volumes for Heimdal Fm traps, both in graph and on map, visualize the range

(P10 – P90) in bubble plots and on map. 5.  Plot all prospects belonging to Tarbert with their main risk factor and value combined with the

Total POS trend map 6.  Show me all wells where we have cores/tests within the Brent Fm……

Geospatial Exploration Performance Analysis

What will be usual questions asked in Geospatial environment?

GIS Strategy within Exploration

Business needs/drivers/value of Spatial Data •  geo spatial query and search of data to be used in identifying new exploration opportunities Front Office environment – Decision Support Environment •  web based GIS technology and later the ‘heavyweight’ desktop version •  introduce ways of working with spatial data combined with textual data Back Office - Information Supply •  develop tools to support specific workflows and geoprocessing •  support and maintenance to Exploration environment Content •  expose high-value legacy data (e.g Cartography and key Exploration data) •  use ‘trusted’ data sources (e.g. official QC’ed E&P repositories) •  link to Interpretation systems data (e.g. Geoframe, Petrel, Petrosys and others) SDE Data management •  increased data management required to develop and maintain spatial data sets •  GIS to be an integrated part of the Information data management system •  establish Procedures and Standards for loading, edit and validate Exploration related GIS data

Integrated Exploration related GIS

GIS Strategy within Exploration

GIS part of total Information Management to make it available to Exploration Applications

High Visibility

Low Visibility

Front Office

Back Office

Standards Procedures

Physical archive Physical archive

Project data

Master data

Data Lifecycle Review

EDMS

Web GIS

Desktop GIS

Knowledge

• Integrate • Edit • Validate • Load

• Access • Transfer • Usage

(modified from Kjetil Tonstad, Statoil, 2003)

Increase Recovery

Lower Business Running Costs

Improve Risk Mgmt

Improve Expl Forecast

Understand Subsurface

Shorten Cycle Time Make people

productive

Create & Support Values Required

Maximise Return On People Employed

Deliver Skills Required

Maximise NPV

Increase Exploration Portfolio Volumes

Reduce Exploration Cost

Maximise Reserve Replacement

Optimise Portfolio Mgmt

Extended Enterprise

Integrated

Real-time Data Access

Information Access

Analytical Tools & Processes

Probabilistic

Visualise Complex Data

Abstraction & Drilldown

Encourage Creativity

Identify Work Priorities

Reduce Non- Productive Time

Objectives

Drivers

Enablers

Learning Organisation

Develop Appropriate Skills

(modified from Enterprise Oil, 2005)

All Exploration related data is Geospatial in nature

We therefore need Geo Spatial Analysis to guide our future exploration efforts

Spatial Analysis lies at the core of GIS

A large range of Geospatial analysis capabilities

GIS Data model

Network Analyst

Cartographic Unit

Modeling interfaces Visualisation

Raster Analysis (Grid)

Geometric Analysis

(modified from Enterprise Oil, 2005)

GIS data processing and analytics

First step for us is to ensure all key data is represented in the GIS database (SDE) in the proper format, verified and maintained according to changes and available in database.

From collection of spatial data to Analytics and Reporting

Continuous ESRI Grids

Esri grid is a raster GIS file format developed by Esri, which has two formats: • A proprietary binary format, also known as an ARC/INFO GRID, ARC GRID and many other variations • A non-proprietary ASCII format, also known as an ARC/INFO ASCII GRID

Perform analysis and managing geographic data. Modeling and analysis capabilities. Automate GIS tasks and develop custom workflows that can be shared

• Mapping • Charting • Reporting • Visualization

Point data (f.inst. well data)

• Isolated plots • Integration of the ESRI map into a report. • Tightly integrate the rich spatial analytic capabilities with reporting function • Online GIS reports • GIS report portal

Collect all types of spatial data that can be used in GIS analysis • Points (parameters, wells, etc) • Cultural (open/restricted regions etc) • Infrastructure (pipelines, cities etc) • Geo referenced graphics (paleo geographic maps, surface maps) •  Ascii Grids (surfaces, topography etc) (modified from ExxonMobil, 2006)

Polygon data (f.inst Paleo geographic maps)

Discrete raster or vector ESRI Grids

Point data in Oracle Database which supports Probability of Success (POS tot) trend data

Dependencies and how to use in Geo Spatial Analysis to understand and increase POS?

POS(tot) POS (reservoir) POS (Closure) POS (Seal) POS (Charge)

•  Target / objective reservoir Fm

•  Depth (Formation tops)

•  Lithology/Environment

•  gross reservoir thickness

•  net reservoir thickness

•  net pay

•  porosity

•  permeability

•  hydrocarbon saturation (gas)

•  hydrocarbon saturation (oil)

•  Main risk/Reason for Failure

•  porosity •  permeability •  formation damage •  facies change •  pinch out •  eroded •  diagenesis •  faulted out •  Unknown

.

• Formation •  TrapType

• dip closure • dip closure with strat comp • fault bounded dip closure • fault bounded dip closure with strat comp • stratigraphic with no structural comp • subcrop (completely stratigraphic • subcrop (completely structural) • subcrop (structural and stratigraphic)

•  Areal Closure (sq km) •  Vertical Closure (ft)

Main risk/Reason for Failure

• no closure • depth conversion • seismic attribute integrity • horizon mispick • fault alias • interpretation integrity • unknown

•  Formation / Member •  top seal •  lateral seal

Main risk/Reason for failure

•  top seal •  thief zone •  lateral seal •  fault breach •  bottom seal •  sub-seismic fractures •  salt or anhydrite •  Unknown •  base seal

Formations

•  primary •  secondary

Type •  oil •  condensate •  gas •  oil / gas •  oil / condensate / gas •  Water

Oil Gravity (oAPI) Gas Density (g/cc) TOC (level and type) GOR Contaminants

•  sulfur •  nitrogen •  carbon dioxide

Main risk/Reason for Failure

•  sufficient maturity •  Presence/ richness •  timing versus closure •  limited access, fetch •  migration shadow •  immature source •  over mature source •  unknown

Amount of Geostatistical Grids

Make sense of relations between Grids and how to use them

POS(tot)

POS (reservoir) POS (Closure) POS (Seal) POS (Charge)

10 continuous geostatistical grids

9 discrete grids and/or continuous deterministic grids

.

16 discrete and/or deterministic continuous grids

2 geostatistical continuous grids

11 deterministic continuous grids

18 deterministic continuous grids

3 geostatistical continuous grids

2 sets of each (P/S)

Most maps are geostatistical grids to be maintained in the SDE database, however there will be a set of derivative grids associate with these, that will be geo-processed using GIS Analyst. This since most points used to generate Geostatistical grids have a range in values (Minimum, Most Likely and Maximum values) which should be used in creation of;

•  Standard Error Map (standard errors of interpolated values) •  Probability Map (interpolated values exceeding given thresholds) •  Quantile Map (to identify overestimated or underestimated interpolated values)

There are over 74 Play types (Objectives) at the moment, with the prospect of this to increase as use of Play type in resource assessment matures in the exploration department.

Updating of these grids needs to be done whenever new values are brought into the database (after prospect review, PDA’s etc). Process for this has to be established to ensure input, QC and maintenance of SDE database.

First things first…….

Then the first step for us is to ensure all key data is present in the GIS database and what is represented in the GIS database (SDE) is in the proper format, verified and maintained according to changes in database.

Providing a large range of Geospatial analysis capabilities (modified from ESRI, 2011)

To be able to perform analysis, managing geographic data, modeling and analysis capabilities by polygon overlays, complex regression analysis and image classification. And being able to automate GIS tasks and develop custom workflows that can be shared

WHAT IS EXPLORATION SPATIAL ANALYSES (ESA)?

“Exploration Spatial Analysis” (ESA) refers to a group of techniques whose aim is to:

• Analyze the data and to describe the spatial distribution of values, • Detect forms of spatial instability (non-stationary), • Identify anomalous locations (spatial outliers), • Discover unexpected directional components (trends) and spatial dependency among values.

ESA assisted Exploration Performance Analysis

The need for Exploration GIS grids to support Decision making

•  Most data available in present AED and ERAD databases are point data sets of various spatial sampling o  These data needs to be presented as grids in an appropriate manner (interpolated)

•  Deterministic method –  Global interpolators (long spaced variations with Spline function) –  Local interpolators (local variations with dense data using Inverse Distance Weighting)

•  Geostatistic method –  mutual correlation by means of variograms and allow assumptions about anisotropy in the spatial structure of

data to be incorporated by the use of Kriging methodology

o  Understand their relations to each others, hence need to understand hierarchy of data dependencies

•  Assess the quality of the prediction in grids made o  Prediction Standard Error Map (standard errors of interpolated values) o  Probability Map (interpolated values exceeding given thresholds) o  Quantile Map (to identify overestimated or underestimated interpolated values)

•  Choice of use of Deterministic over Geostatistical grids has to be made based on the knowledge of the data points to be used. The less known, the more plausible it is to use deterministic as a first approach

•  The aim of the establishing of grids is to support critical exploration decision processes, and the flexibility and uncertainty estimation offered by a geostatistical approach is to be preferred wherever it is possible

Understand data and its Quality is imperative

Critical E&P Data and how to use them in Exploration Spatial Analysis ?

•  PLAY TYPES, PROSPECTS AND LEADS o  RESERVOIR o  TRAP (called Closure in some systems) o  SEAL o  CHARGE o  Palaeo geographic maps o  Other attributes

•  CONTINGENT RESOURCES o  SHOWS o  UNTESTED HYDROCARBON COLUMN o  UNDEVELOPED DISCOVERIES

•  DRILLING OPERATIONS DATA

•  WELL DATA REQUIREMENTS

Determine data dependencies to understand Probability Of Success (POS) trends

These entities will have the same parameters as any other Prospect in the portfolio would have (see slides ahead), however in addition these entities would have more emphasis on parameters stated below.

•  SHOWS

o  Stratigraphy (name) o  Type (oil/gas/condensate) o  Quality (classification 1-5 based on scale determined)

•  UNTESTED HYDROCARBON COLUMN o  stratigraphy (name) o  Interval (ft/meters) o  type of hydrocarbon (oil, gas, condensate)

•  UNDEVELOPED DISCOVERIES (where, production test volumes

Not any different from other Exploration data apart from the fact; there is more data associated with these entities to perform analysis on

Contingent Resources Analysis

•  DRILLING OPERATIONS DATA

o  Drilling Time / Depth Curve o  Drill time to all objectives (days)

o  Coring o  Time used for coring ( hours)

o  Logging o  Testing o  Pressure

•  WELL RESULTS o  Success o  Failure o  Well Classification o  Technical Drilling Operations Problems

Support interpreters understanding drilling technical aspects of their prospects

Drilling related data

These data would be able to analyze at objective level combined with any other type of attribute set from all risk

factors (reservoir, closure, seal and charge) and contingent resources entities.

o  Wireline and Mud Logs o  Tests (DSTs, RFTs, etc.) o  Cores, SWCs, Cuttings o  Mud Type o  Pressure Data

•  depth •  Formation

Support decisions on well log program and guide interpreters to what data is available for analysis of wells

Overview of available data and assist in optimizing future evaluation programs

Well data requirements

Create GIS Grids

Derive a continuous surface from point observations with little understanding. (from Exprodat, 2010)

Need GIS grids of critical E&P data

•  Most data available in present Exploration databases are point data sets o  Need to be gridded appropriately

•  Deterministic method –  Global interpolators –  Local interpolators

•  Geostatistic method –  mutual correlation by means of variograms and allow assumptions about anisotropy in the

spatial structure of data to be incorporated by the use of Kriging methodology

o  Understand their relations to each others, hence need to understand hierarchy of data dependencies

•  Assess the quality of the prediction in grids made o  Make Prediction Standard Error Map (standard errors of interpolated values) o  Probability Map (interpolated values exceeding given thresholds) o  Quantile Map (to identify overestimated or underestimated interpolated values)

Understand data and its Quality is imperative