The Planning Act 2008 consenting regime Robbie Owen and Angus Walker – Partners.
Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha...
Transcript of Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha...
![Page 1: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/1.jpg)
GNS Science
Ngawha Reservoir Model
John Burnell
JOGMEC-GNS Workshop, Tokyo
2 June 2016
![Page 2: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/2.jpg)
GNS Science
Outline
• Purpose
• Conceptual Model
• Model Structure
• Model Verification
• Expansion Scenario
• Surface Features Model
Slide 2
![Page 3: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/3.jpg)
GNS Science
Purpose
• To develop a numerical reservoir model of the Ngawha Geothermal Field for consenting purposes
• Objectives
– Obtain an acceptable match to historical data
– Use a dual porosity model to more accurately model
injection returns in the reservoir
– Consider effects of possible future expansion
– Predict impact on surface features
Slide 3
![Page 4: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/4.jpg)
GNS Science
Conceptual Model
Slide 4
![Page 5: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/5.jpg)
GNS Science
Reservoir Characteristics
• Reservoir hosted in Waipapa Greywacke between 500m and 1500m depth
– Low porosity
– Permeability due to fractures and faults
• Low permeability siltstones form a cap
– Some transport through faults and fractures
Slide 5
![Page 6: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/6.jpg)
GNS Science
Resource Areas
Operations area
Slide 6
![Page 7: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/7.jpg)
GNS Science
Reservoir Characteristics II
• Geology
– Permeable greywacke
– Cap with small channels connecting to surface
• Temperatures in permeable reservoir are ~230 °C
• Hotter temperatures in the north
• Pre-production testing suggested fractured
reservoir with high permeability
• Hot upflow > 300°C, located in north < 10 kg/s
• CO2 concentrations ~1.5%
Slide 7
![Page 8: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/8.jpg)
GNS Science
Hydrological Model
Slide 8
![Page 9: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/9.jpg)
GNS Science
Model Validation Data
Slide 9
• Pre-production temperature and pressure measurements.
• Measured changes in reservoir pressure due to production.
• Changes in production enthalpies.
• Changes in CO2 concentrations in production wells.
• Measured pressure changes in the 1983
interference tests.
• Travel times from the 2011 tracer test.
![Page 10: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/10.jpg)
GNS Science
Dual Porosity Numerical Reservoir Model
Slide 10
![Page 11: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/11.jpg)
GNS Science
Dual Porosity Model
Matrix
Fracture
Used to represent flows in fractures• Fast flow paths• Small volumes
• Model cooling
Slide 11
![Page 12: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/12.jpg)
GNS Science
Model Grid
Slide 12
![Page 13: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/13.jpg)
GNS Science
Geology and Resource Boundary
Permeable inner region
Slide 13
![Page 14: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/14.jpg)
GNS Science
Upflow
Upflow = 10 kg/s
Slide 14
![Page 15: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/15.jpg)
GNS Science
Model Verification
Slide 15
![Page 16: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/16.jpg)
GNS Science
Methodology
• Run natural state model
– Compare to measured temperatures and pressures
• Run historical production
– Compare to measured pressure changes, enthalpies and CO2 concentrations
• Add tracer injection.
– Compare to measured tracer
• Run production and injection for 1983
interference test
– Compare to measured pressures
Slide 16
![Page 17: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/17.jpg)
GNS Science
Natural State Temperatures
Slide 17
![Page 18: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/18.jpg)
GNS ScienceSlide 18
![Page 19: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/19.jpg)
GNS Science
Some Improvements Still Needed
Slide 19
![Page 20: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/20.jpg)
GNS Science
Natural State Pressures
Slide 20
![Page 21: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/21.jpg)
GNS Science
Changes Due to Development
Slide 21
![Page 22: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/22.jpg)
GNS ScienceSlide 22
![Page 23: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/23.jpg)
GNS Science
Pressures in Injectors Don't Match as Well
Slide 23
![Page 24: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/24.jpg)
GNS Science
Production Enthalpies
Slide 24
![Page 25: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/25.jpg)
GNS ScienceSlide 25
![Page 26: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/26.jpg)
GNS ScienceSlide 26
![Page 27: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/27.jpg)
GNS Science
Issues with Enthalpies
• Inconsistent with measured tempertures
– NG9 temperatures give enthalpies of 980 kJ/kg
– Initial data – 920 kJ/kg
– Also inconsistency between well enthalpies and station enthalpies
– In other fields it is suggested that measurement uncertainties are ~100 kJ/kg
– If this is the case then the model agrees within
measurement uncertainty.
Slide 27
![Page 28: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/28.jpg)
GNS ScienceSlide 28
![Page 29: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/29.jpg)
GNS Science
CO2 Concentration
• CO2 gives information about long term connection between injectors and producers
Slide 29
![Page 30: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/30.jpg)
GNS ScienceSlide 30
![Page 31: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/31.jpg)
GNS ScienceSlide 31
![Page 32: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/32.jpg)
GNS Science
Tracer Test – Injection into NG16
• Arrival times give information about short term transport between injectors and producers
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Co
nc
en
tra
tio
n (
ug
/L)
NG16 Tracer
NG4
NG9
NG12
Slide 32
![Page 33: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/33.jpg)
GNS Science
Model Results
Arrival time
Slide 33
![Page 34: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/34.jpg)
GNS ScienceSlide 34
![Page 35: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/35.jpg)
GNS Science
Interference Test – October 1983
• Pressure propagation across the reservoir
Slide 35
![Page 36: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/36.jpg)
GNS Science
Overall Match
• Ngawha Numerical Reservoir Model is well-calibrated
• Matches data from many different aspects of the field
• Based on physical understanding
– Reduces uncertainty
Slide 36
![Page 37: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/37.jpg)
GNS Science
Expansion Scenarios
Slide 37
![Page 38: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/38.jpg)
GNS Science
Expansion Scenarios
• Two scenarios
– Scenario A: 25 MWe expansion
– Scenario B: 50 MWe expansion
• 25 MWe stage from 2020
• 50 MWe stage from 2023
• Adjusted injection rates to match observations
– Loss of gases (currently 0.5%)
– Other loses/spillages (0.35%)
• Used supplemental injection to control reservoir pressures
Slide 38
![Page 39: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/39.jpg)
GNS Science
Scenario Pressures
Slide 39
![Page 40: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/40.jpg)
GNS Science
Some pressure changes
Slide 40
![Page 41: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/41.jpg)
GNS Science
Enthalpies Decline
Slide 41
![Page 42: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/42.jpg)
GNS Science
Will need some plant changes
Slide 42
![Page 43: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/43.jpg)
GNS Science
Surface Feature Modelling
Slide 43
![Page 44: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/44.jpg)
GNS Science
Surface Feature Modelling
• Ngawha Springs are valued highly by local community
• Ngawha Springs have low flow rates
• Reservoir model is too coarse to capture changes in flow to surface features
• Developed a separate model of the area around the surface features
Slide 44
![Page 45: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/45.jpg)
GNS Science
Schematic of Surface Feature Model
Deep Reservoir
Surface Waters
CaprockPermeable
Conduit
Slide 45
![Page 46: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/46.jpg)
GNS Science
Model Grid
Slide 46
![Page 47: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/47.jpg)
GNS Science
Vertical Extent
Slide 47
![Page 48: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/48.jpg)
GNS Science
Natural State Temperatures
Slide 48
![Page 49: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/49.jpg)
GNS Science
Natural State Pressures
Slide 49
![Page 50: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/50.jpg)
GNS Science
Surface Feature Model Setup
• Fixed pressures and temperatures in the bottom boundary
– Corresponding to measured reservoir data
• Fixed conditions in atmosphere
• Flow driven by boundary conditions
– Adjust conduit permeability to match flow
– Modelled flow was 1.3 kg/s
Slide 50
![Page 51: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/51.jpg)
GNS Science
Response to Production
• Used output from numerical reservoir model expansion scenario
– Reduced reservoir pressure by 0.3 bar
– Reduced reservoir temperature by 1 °C
– Reduced reservoir CO2 mass fraction from 1.3% to
0.1%
Slide 51
![Page 52: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/52.jpg)
GNS Science
Surface Feature Model Results – Flow to
Surface
Slide 52
![Page 53: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/53.jpg)
GNS Science
Surface Feature Model Results – Steam
Fraction
Slide 53
![Page 54: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/54.jpg)
GNS Science
Surface Feature Model Results – Temperature
Slide 54
![Page 55: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/55.jpg)
GNS Science
Surface Feature Model Results – CO2 in
Discharge
Slide 55
![Page 56: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/56.jpg)
GNS Science
Chemistry Calculation for Surface Features
• Ran a calculation with GeoChemist Workbench to obtain spring chemistry
• Reduced the CO2 content and re-calculated
• The main changes are an increase in pH (6.2 => 6.95) and a reduction in HCO3-.
Slide 56
![Page 57: Ngawha Reservoir Model - JOGMECgeothermal.jogmec.go.jp/report/file/session_160602_06.pdfNgawha Geothermal Field for consenting purposes • Objectives – Obtain an acceptable match](https://reader034.fdocuments.net/reader034/viewer/2022050303/5f6c0b85c3a9824bf3331d7d/html5/thumbnails/57.jpg)
GNS Science
Conclusions
• Well-calibrated model for consenting purposes
• Matches many different aspects of flow in the
reservoir
• Pressures can be controlled for 50 MWeexpansion scenario
• Impact on surface features is minor
Slide 57