Abstract：As a hydrocarbon reservoir monitoring approach, the time-lapse seismic is not widely used due to its high cost and high risks and time-lapse seismic data is not enough for reminding resource potential study.Therefore we conduct a reminding gas potential study based on quasi time-lapse seismic data.We use 2D seismic data (surveyed in 2001) as basic data and 3D seismic data (surveyed in 2015) as monitoring data in a later-stage gas-field, South China Sea.We analyze the relationship between water and gas and predict water invasion mode on the quasi time-lapse seismic data.According to frequency-segmented attributes and production information, we build a dynamic reservoir model, and then obtain reminding gas potential.Based on our study, as high and medium permeability barriers, the northwest part of the gas-field has limited reminding potential due to strong water approaching; while the southeast part has great reminding potential with argillaceous and stable barrier, which is a favourable zone for the later deployment.Our application proves that the proposed quasi time-lapse seismic might play an important role in the reminding resource potential study.
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