More than half of the world's population lives within 60 km of a coastline. The demand for groundwater in these areas is increasing and in many cases is causing stress on the groundwater resource. Schlumberger Water Services (SWS) provides clients with advanced solutions for mitigating impacts from saltwater intrusion.
SWS works with clients to define a procedure to overcome the most challenging obstacles during any saltwater intrusion management project. Solutions include subsurface characterization, groundwater monitoring, advanced data management, analysis, and visualization solutions to better understand the coastal aquifer behavior and then select the best approach for optimizing water supply.
SWS' industry-leading logging technologies reduce risk and uncertainty when quantifying aquifer properties, defining aquifer heterogeneity, and determining water quality in both open boreholes and cased wells. This valuable information improves conceptual aquifer model development leading to realistic flow modeling.
Schlumberger is able to provide a high degree of confidence in Aquifer Storage and Recovery solutions through its geophysical logging, simulation and modeling, wellfield construction, aquifer monitoring, and project management expertise. Large volumes of water can be stored safely in depleted aquifers by recharging through specially designed wells capable of providing recovery, whenever needed, through the same wells. In such a manner, water can be stored at a fraction of the cost of the conventional approaches (e.g., surface reservoirs and tanks). It is possible to store a few billion gallons underground that can be called upon to supplement or support a city's or region's water supply for a number of months.
Injecting brine or desalinized water into deep nonpotable aquifers can solve contamination issues in confined aquifers. This is a common practice in the petroleum industry. To determine contamination levels and ensure successful brine injection practices, the injection wells must be monitored regularly for electrical conductance. SWS' CTD-Diver automated datalogger is built for this purpose—it measures electrical conductivity, thus giving the user an indication of contaminants.
Integrating our advanced instrumentation, modeling software, and expertise in the challenges and behavior of coastal zone water systems allows us to mitigate saltwater intrusion. Our solutions allow you to
Removing too much water from your aquifers can lead to dramatic land subsidence. SWS provides the tools needed for monitoring and assessing changes in aquifer pressure. Through continuous monitoring and adjusting water removal rates or injection rates accordingly, land subsidence can be mitigated. A well-planned network of monitoring wells can also help you identify untapped potable water resources to increase your supply.
Continuous groundwater monitoring, especially with warning systems and anthropic activity monitors, is essential in coastal aquifers. CTD-Diver dataloggers can detect vertical distribution of the salt concentration by monitoring water levels and water quality (conductivity). The Westbay System modular monitoring platform allows for discrete sampling of groundwater from multiple zones in a single borehole, providing a means of collecting much larger amounts of data. Detailed and accurate long-term monitoring is critical in coastal zones, particularly in the wake of climate change.