Unfortunately, traditional methods of monitoring and surveillance are unable to provide the detailed pieces of information. Through this application, we have studied systematically all steps of the method, including survey design, data acquisition, process-ing, and quantitative interpretation.Īn efficient reservoir surveillance and monitoring technique should be able to monitor changes in the reservoir fluid and provide a better understanding of the spatial movement and distribution of fluids over time. The site formed an ideal natural laboratory for investigating vari-ous aspects of time-lapse gravity methodology. Quantitative interpretation based on 3D inver-sions produced hydrologically meaningful density-contrast models and imaged major zones of water distribution. The time-lapse microgravity surveys successfully detected the distribution of injected water as well as its gener-al movement. As a key component in the geophysical monitoring of the artificial ASR system, three microgravity surveys were conducted over the course of ten months during the initial water-injec-tion stage.
Water from surface sources is injected into the artificial aqui-fer during winter for retrieval and use in summer. An abandoned underground coal mine has been developed into a subsurface water reservoir. We studied time-lapse gravity surveys applied to the moni-toring of an artificial aquifer storage and recovery ASR sys-tem in Leyden, Colorado.