the use of gis in geothermal resource...
TRANSCRIPT
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•Cartographer
Beatrice Gichini
•3rd November, 2016
United Nations Conference Centre, Addis Ababa
THE USE OF GIS IN GEOTHERMAL RESOURCE MANAGEMENT
A CASE STUDY OF OLKARIA GEOTHERMAL PROJECT
Proceedings, 6th African Rift Geothermal Conference, Addis Ababa, Ethiopia, 31st October- 8th November, 2016.
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Conclusions and Recommendations
Challenges of GIS in Geothermal Development
How does it fit in a Geothermal Project?
GIS and data organization - database
What is GIS, its components, principles and functions
Introduction
Outline
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• The EARS starts from the
Afar Junction and
spreads down to Beira in
Mozambique.
• Kenyan Rift System falls
in the eastern arm of the
rift valley.
Geothermal Energy within the
Great Rift valley
The eastern arm of the Rift Valley
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Kenyan Rift System
The location of the Kenyan Rift System Source:
• Kenya is endowed with a
vast amount of geothermal energy. >10,000MW (Ofwona et al, 2006)
• Comprises more than 14
volcanic centres. • Olkaria geothermal
complex one of the major volcanoes.
Olkaria
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Critical Challenges in Geothermal
Resource Development While it's easy to see that geothermal is a viable, growing
and environmentally "friendly" energy source, many of its
challenges are not easily met. They include:
–Extreme high temperatures
–Hard and corrosive rock
–Lost circulation
–Cement and casing integrity
–Minerals and toxic gasses
–Well site environmental concerns
The constraints associated with Geothermal development,
mainly due to the risks associated with its exploitation
requires explicit methods.
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What is GIS?
GIS = Geographic Information System
A GIS integrates hardware, software and data for capturing,
managing, analyzing and displaying all forms of geographically
referenced information.
Capture Manage Analyze Display
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Components of GIS
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Principles and functions of GIS
Manipulates data
spatially:
• Calculate distances and adjacencies
• Change projections and scales
• Integrate disparate sources
Analyse data
spatially:
• Quantitative analysis
• Exploratory spatial data analysis
• Qualitative analysis
Visualise data:
• Maps
• Tables, graphs, etc.
• Animations
• Virtual landscapes
GIS
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GIS database and Data Organization
• A GIS program stores information about an area as a collection of
thematic layers that can be linked together by relationship
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Geothermal assessment requires identification of areas
where:-
- Temperatures are higher up to a certain level –
heat source
- Permeability is high enough to allow the flow of
fluids.
- Super heated fluids – Geothermal fluids
Geothermal assessment studies generates a vast
amount of data which requires innovative information
management.
GIS comes as a response for the dire need of innovative
technology which together with many others may fast
track geothermal development.
Represents one of the most modern methods of location
based data integration with integrity and accuracy .
Our Need For GIS
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GIS run as a process workflow in Olkaria
It works in phases throughout the field
development processes;
(i) Exploration phase/ resource assessment
(ii) Action / drilling phase
(iii) Steam gathering phase
GIS Fit in Olkaria Geothermal Field
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Exploration / Resource Assessment Phase
Involves three phases:- (i) Exploration phase /
resource assessment
All the data required from variety of sources:- geology, geophysics,
geochemistry, Environment and so on are gathered and overlaid
Social
Factors
Geochemistry
Faults and
structures
Terrain
Geophysics
Geology
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Exploration / Resource
Assessment Phase cont’d
(i) Exploration phase /
resource assessment
Suitability analysis and Weighted overlay are used to identify suitable areas.
Output…..
model
Assign weights,
create a model
builder, Query and
display
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Action / Drilling Phase
(ii)Action Phase – Drilling phase
(a) Well planning Used to plan well pad
patterns around multiple surface drilling constraints.
Its unique spatial analytics
used to optimize drilling patterns to calculate the most efficient drilling configuration based on the distances and the angle deflections
Directional wells in a 2D
diagram
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Action / Drilling Phase cont’d
(ii) Action Phase – Drilling phase
(b) Well progress Monitoring
Production data updated in a
near real time on the map
Allows creation of dashboard
applications showing wells
which are ongoing, proposed
and production.
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Steam Gathering Phase
(iii) Pipeline Routing (a) Steam gathering Design – Critical first step in the
process of pipeline design. Significantly impacting the
designing of optimal path for the pipeline.
Most suitable route two
points determined by evaluating the criteria through critical path analysis.
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Future of GIS in Geothermal development
and emerging trends.
• A new insight for geoscientists.
• Solution for 3D visualization and effective management
of both directional and vertical well drilling data in
ArcGIS.
• Supports real-time 3D-GIS properties, proximity of
wellbores, drilling data analysis providing geoscientists
with a unique and powerful interpretive capability.
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Future of GIS in Geothermal development
and emerging trends cont’d.
Eliminating drilling risks with ArcGIS Distance from target-point to bottomhole - Calculates distance between project
and actual bottomhole.
Source : Data East LLC
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Future of GIS in Geothermal development
and emerging trends cont’d.
Eliminating Drilling risks with Well Tracking Paths divergence- Calculates distance between adjacent wellbore paths
Source : Data East LLC
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Future of GIS in Geothermal development
and emerging trends Cont’d.
3D Viewer Allows visualizing spatial drilling data in an interpretive 3D model
Source : Data East LLC
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Challenges of using GIS
The main problem with the software is cost.
The cost for site licenses for most mainstream GIS packages
is far too expensive for most companies.
Data formats interoperability limitation
Only a small percentage of Geothermal data formats are
compatible with GIS.
Much of the data in store is in hard copies, converting this into
digital data becomes difficult and expensive.
Down Hole data processing
Very little has been done on the subsurface. This is in the
initial stage. Enough effort has been put in place to
accommodate data for the subsurface
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Recommendation and conclusions
With the new welltracking tools extensions in
ArcGIS, visualization of wells becomes much better.
Decision making and knowledge exchange
becomes reliable.
Analysis for resource development gets simpler as
GIS has become a common tool.
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