4D Seismic Exploration

ㅇ Digital reservoir model was generated using the result of the seismic data processing and interpretation in order to confirm the structure and the shape of Gorae V in the block 6-1

ㅇ After ray trace modeling for the digital structure model, the synthetic seismic section, synthetic source gather, synthetic CDP gather were generated. Using these synthetic data, 4D difference map was made. and then some variable attributes depended on barrier, aquifer, by-pass structure was predicted.

ㅇ Aquifer of the DongHae-1 gas field was not confirmed using the production data for two years. But when using the 4D seismic data, the size of aquifer and the variation of recoverable reserves could predictable.

ㅇ In case there is by-passed pay zone or barrier in the reservoir, these zones could be detectable by 4D seismic. and decrease of the reserves can be prevented and the location of In-fill drilling can be selected effectively.

ㅇ The variation of the recoverable reserves due to the variation of the relative permeability could use to predic the movement of GWC and seismic amplitude variation in 4D seismic research. Subsequently, the error of the amplitude variation and the variation of the recoverable reserves could be predictable.

ㅇ In the future, 4D seismic response for the attributes of the reservoir such as trap gas by the variation of the relative permeability may need to be continued. Also, the research for the recoverable reserves about the attributes of the reservoir. and 4D difference map include the acoustic impedance difference and the effect of the seismic wavelet and ray path analysis methods need to be continued.