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LIVE WEBINAR – Modelling the Impact of Faults on Near Surface Aquifers in Environmental Impact Statements for Unconventional Oil and Gas

Tuesday, 22 February, 2022 @ 11:00 am - 12:00 pm (Australia/Perth time)

Free – $10.00

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Guest Speaker(s): Titus Murray

Titus Murray is a NSW-based structural geologist, consultant, and independent researcher with over 30 years experience in structural geology. Titus has specific and intensive experience in the fields of oil and gas and groundwater. He has spent much of the last 15 years developing methods for the analysis of fault seal. He also conducts and advises independent research on the character and geometry of fault zones. He also has significant experience with the development and constraint of trap structures in oil and gas exploration.

Kindly supported by Rock Flow dynamics

 

This live webinar will take place at:

11am              – Perth
12.30pm       – Darwin
1pm                – Brisbane
1:30pm          – Adelaide
2pm                – Canberra, Hobart, Melbourne, Sydney

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Tickets are free for members (please log in to see this) and $10 for non members.

Please buy your tickets and immediately follow the link in the ticket e-mail (not the calendar invite or this webpage, which is just generic and not event specific) to set up your registration with the webinar software well in advance of the time of the talk. Once registered with the webinar software you will receive a reminder e-mail 1 hour beforehand.

Modelling the Impact of Faults on Near Surface Aquifers in Environmental Impact Statements for  Unconventional Oil and Gas

Presented by Titus Murray (Southern Highlands Structural Geology)

Abstract

Unconventional oil and gas developments may require considering the potential hydrological impacts of faults on near-surface groundwater assets. It is vital that faults are represented appropriately. There are several examples where faults have been invoked as part of “Straw Man” arguments to oppose development (Currell et. al. 2017 and Iverach et. al. 2020). The processes of dewatering and hydraulic fracture stimulation may generate preferential pathways for flow that impact aquifers and groundwater dependant ecosystems. As part of this, a clear framework for the assessment of the impact of faults has been provided in Murray and Power 2021. This study presents three distinct end-member geological scenarios and outlines methods for characterising fault-related groundwater flow within a risk assessment context.
1 )Regional aquitard isolates aquifer from development. Low risk of leakage across the aquitard because there are no faults, or the faults have displacements less than the thickness of the aquitard.
2) Region-wide aquitard is not present, the development and the groundwater assets are within the same groundwater system. CSG development may cause pressure to propagate parallel to the strike and dip of the fault in the fault damage zones.
3 )Regional aquitard(s) are present, but larger displacement faults breach the aquitards, allowing for possible combinations of across-fault connections between the different aquifers, and between aquifers and the coal seams. In this scenario, potential flow pathways between the groundwater and the development need to be characterised using Allan Maps (fault plane profiles).
In the talk, we will use case studies from Narrabri, Camden and the Galilee basin.

Details

Date:
Tuesday, 22 February, 2022
Time:
11:00 am - 12:00 pm
(Australia/Perth time)
Cost:
Free – $10.00
Event Categories:

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    PESA Western Australia
    PESA Webinars

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