An efficient approach for characterizing basin-scale hydrodynamics |
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| Affiliation: | 1. Alberta Geological Survey, 4999 98 Avenue, Edmonton, Alberta, Canada;2. Saskatchewan Geological Survey, Saskatchewan Ministry of the Economy, Regina, Saskatchewan, Canada;3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada;1. Applied Research in Ichnology and Sedimentology (ARISE) Group, Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada;2. Groundwater Resources Research Group (GRRG), Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada;1. Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Mangiagalli 34, 20133, Milano, Italy;2. Institute of Applied Geosciences, School of Earth & Environment, University of Leeds, Leeds, LS2 9JT, UK;1. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China;2. Petrochina Jilin Oilfield E&P Research Institute, Songyuan, Jilin 138000, China;3. Petrochina Daqing Oilfeld E&P Research Institute, Daqing, Heilongjiang 163001, China;1. School of Geosciences, China University of Petroleum, Qingdao, Shandong Province, 266580, China;2. School of Earth & Environment, University of Leeds, Leeds, West Yorkshire, LS2 9JT, England, UK;1. Centre for Research Into Earth Energy Systems (CeREES), Department of Earth Sciences, Science Labs, Durham University, DH1 3LE, UK;2. School of Civil Engineering and Geosciences, Newcastle University, Newcastle Upon Tyne, Tyne and Wear, NE1 7RU, UK |
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| Abstract: | As the upstream oil and gas sector continues to use more groundwater resources for their operations, a comprehensive understanding of formation fluids at the sedimentary basin scale is required to inventory and manage available groundwater resources. Basin-scale fluid flow is often simplified to only assess pre-development groundwater conditions without understanding how large-scale hydrocarbon development might be changing regional flow patterns. This study focuses on two aspects of hydrogeological mapping for characterizing basin-scale hydrodynamics: (1) assessing the influence of hydrocarbon production and injection on pressure measurements used to map hydraulic heads and infer groundwater conditions; and (2) determining the effects of variable density groundwater on understanding the magnitude and direction of flow primarily in saline formation water aquifers. Drillstem Tests (DST's) are transient pressure tests that are used to infer regional groundwater flow, but they can be strongly affected when the sample location is located within the vicinity of a hydrocarbon production or injection well. To identify production and injection influences this study implements a Cumulative Interference Index (CII) methodology. This implementation can be used to map pre-development groundwater flow conditions and evaluate regional changes or effects due to historical oil and gas activity. Density effects are often neglected and can have considerable effect on groundwater flow in cases where aquifers contain dense brines, are inclined and sloping, or possess weaker hydraulic gradients than the buoyancy force potential. This study implements a vectorial analysis to identify flow directions in regions where density driven flow is important and can change the inferred magnitude and direction of flow. Two case studies are presented to demonstrate the effectiveness of these methodologies at evaluating basin-scale hydrodynamics. |
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| Keywords: | Groundwater mapping Production induced drawdown Production and injection influences Drillstem tests Variable density Hydrodynamics |
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