Recent advances in microgravity technology have improved precision, making the microgravity method a cost effective tool<br>for reservoir monitoring in a time-lapse (4D) mode. Surface recorded gravity can now be reliably measured to five microgal<br>accuracy, allowing small changes in fluid type in subsurface reservoirs to be monitored. RasGas Company Limited (RasGas)<br>has successfully been using this 4D microgravity method to monitor waste gas injection near the LNG plants at Ras Laffan<br>Industrial City (RLIC). This method has proved to be a very cost effective and intrinsically safe way to monitor the<br>movement of gas injected into an aquifer at approximately 5000 ft depth in an industrial environment.


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