The Australian Pacific Liquefied Natural Gas (APLNG) Project involves the production of Coal Seam Gas (CSG) in numerous tenements across the Surat Basin in southeast Queensland. The CSG production process requires depressurisation of the coal seam by groundwater pumping from gas production wells.
Klohn Crippen Berger (KCB) was commissioned by Origin Energy to provide hydrogeological field supervision services for the installation of a network of regional groundwater monitoring bores throughout Origin’s existing gas producing operations and pilot facilities.
The primary purpose for the installation of groundwater monitoring bores is to expand Origin’s regional monitoring network to assist in monitoring aquifer parameters (water pressure, quality and gas) over the long term to assess whether impacts may occur from CSG operational activities. In addition, these bores will be used to provide information regarding hydraulic properties and local aquifer characteristics.
These bores are typically installed with water well drilling rigs, with a small proportion constructed with coal seam gas rigs. Construction is typically steel cased at above the target zone and open-hole through the target zone. Groundwater monitoring would include ambient conditions, level, flow, field parameter and sampling of groundwater bores.
- Supervision of drilling contractors during monitoring bore installation
- Mud and core logging
- Confirming stratigraphic prognosis
- Test pumping supervision
- Groundwater sampling
- Analytical Assessment