期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 124, 期 7, 页码 6880-6907出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JB016429
关键词
seismic monitoring; carbon storage; time-lapse seismic; seismic velocity changes
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Coal and Power Systems through the National Energy Technology Laboratory [DE-FC26-05NT42590, DE-AC02-05-CH11231]
Time-lapse seismic amplitude differences and travel time shifts, obtained while monitoring enhanced oil recovery at Cranfield, Mississippi, reveal coherent changes that are associated with the injection of carbon dioxide. Rock physics modeling highlights the importance of the oil, brine, and gas content of pore fluids prior to the injection of carbon dioxide. For example, compressional velocity changes due to the injection of carbon dioxide can drop from 300m/s to less than 100m/s as the percentage of oil increases from 1% to 50%. Predictions based upon a new technique for modeling wave propagation in a poroelastic medium containing an arbitrary number of fluids, coupled with multicomponent numerical reservoir modeling at Cranfield, reproduce the general pattern of observed seismic amplitude changes and travel time shifts. In particular, time-lapse amplitude changes suggest a significant and widespread lowering of compressional velocities due to the injection of CO2 into an aquifer bounding the oil rim of the reservoir. It appears that the large-scale variations in preexisting pore fluid content have a major influence on seismic velocity changes, even in the highly heterogeneous reservoir at Cranfield.
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