Aquitard and Fault Simulation Approaches for Use in Regional-Scale Assessments of Coal Seam Gas Extraction Impacts

2016 ◽  
Author(s):  
C. Turnadge ◽  
D. Mallants ◽  
L. Peeters
Keyword(s):  
Coal Seam ◽  
Fault Simulation ◽  
Regional Scale ◽  
Gas Extraction ◽  
Coal Seam Gas

An integrated approach to the Surat Basin stratigraphy

2019 ◽  
Vol 59 (2) ◽  
pp. 940
Author(s):  
Mark Reilly ◽  
Suzanne Hurter ◽  
Zsolt Hamerli ◽  
Claudio L. de Andrade Vieira Filho ◽  
Andrew LaCroix ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Coal Seam ◽  
Methodological Approach ◽  
Regional Scale ◽  
Integrated Approach ◽  
Field Scale ◽  
Coal Seam Gas ◽  
Sequence Stratigraphic ◽  
Flow Models ◽  
Lithostratigraphic Units

The stratigraphy of the Surat Basin, Queensland, has historically been sub-divided by formation and unit nomenclature with a few attempts by other authors to apply sequence stratigraphy to existing formation boundaries. At a local- to field-scale, lithostratigraphy may be able to represent stratigraphy well, but at regional-scale, lithostratigraphic units are likely to be diachronous. To date, this lithology-driven framework does not accurately reflect time relationships in the sub-surface. An entirely new integrated methodological approach, involving well tied seismic data and sequence stratigraphic well-to-well correlations compared with published zircon age dates, has been applied to hundreds of deep wells and shallower coal seam gas wells. This method sub-divides the Surat Basin stratigraphy into defendable 2nd order to 3rd order sequence stratigraphic cycles and has required the use of an alpha-numeric sequence stratigraphic nomenclature to adequately and systematically label potential time equivalent surfaces basin-wide. Correlation of wells is the first step in building models of aquifers and coal seam gas fields for numerical simulation of fluid flow, which is necessary for responsible resource management. Lithostratigraphic correlations will overestimate the extent and hydraulic connectedness of the strata of interest. The result may be fluid flow models that do not represent a realistic pressure footprint of the flow. The present sequence stratigraphic method more accurately reflects the disconnectedness of sub-surface coals and sandstones (aquifers) on a field-to-field scale, adjacent field-scale, and basin-wide scale. It forms the basis for improved and more representative modelling of the sub-surface.

Experimental Study on Deep Borehole Pre-Cracking Blasting of Drilling through Strata at Low Permeability Seam

2013 ◽  
Vol 868 ◽  
pp. 339-342
Author(s):  
Jian Liu ◽  
Qian Le
Keyword(s):  
Coal Seam ◽  
Control Area ◽  
Low Permeability ◽  
Gas Extraction ◽  
Test Results ◽  
Deep Borehole ◽  
Coal Seam Gas ◽  
Gas Concentration ◽  
Working Face ◽  
Outburst Coal Seam

In the process of roadway excavation in the low permeability outburst coal seam, with drilling through strata in the bottom drainage roadway extracting coal seam gas of control area. In order to improve extraction effect, the method that deep borehole pre-cracking blasting is used to increase the permeability of coal in the drilling through strata seam segment is proposed. The calculation formula on crushing circle and crack circle radius of deep borehole pre-cracking blasting are derived, and the effective loosening radius of blasting is calculated in theory, the research achievements are applied to field test, the test results show that deep borehole pre-cracking blasting permeability improvement technology is carried out in the drilling through strata of the low permeability outburst coal seam, the permeability of coal seam is improved by 180 times, the gas extraction scalar is raised by 8-10 tomes, during the process of roadway excavation, gas concentration of the working face is 0.2%-0.3%, and tunneling footage is increased by 2 times.

Regional-scale modelling and predictive uncertainty analysis of cumulative groundwater impacts from coal seam gas and coal mining developments

2019 ◽  
Vol 28 (1) ◽  
pp. 193-218 ◽  
Author(s):  
J. Sreekanth ◽  
Russell Crosbie ◽  
Trevor Pickett ◽  
Tao Cui ◽  
Luk Peeters ◽  
...  
Keyword(s):  
Coal Seam ◽  
Uncertainty Analysis ◽  
Coal Mining ◽  
Regional Scale ◽  
Coal Seam Gas ◽  
Predictive Uncertainty ◽  
Scale Modelling

Fracked: Coal seam gas extraction and farmers’ mental health

2016 ◽  
Vol 47 ◽  
pp. 22-32 ◽  
Author(s):  
Methuen I. Morgan ◽  
Donald W. Hine ◽  
Navjot Bhullar ◽  
Debra A. Dunstan ◽  
Warren Bartik
Keyword(s):  
Mental Health ◽  
Coal Seam ◽  
Gas Extraction ◽  
Coal Seam Gas

Modelling the cumulative impacts of future coal mining and coal seam gas extraction on river flows: applications of methodology

2021 ◽  
pp. 126440
Author(s):  
Neil R. Viney ◽  
David A. Post ◽  
Yongqiang Zhang ◽  
Fazlul Karim ◽  
Santosh K. Aryal ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Gas Extraction ◽  
Cumulative Impacts ◽  
Coal Seam Gas ◽  
River Flows
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