Abstract:

It is necessary and important to use seismic data to predict reservoir in oil and gas exploration, especially for offshore exploration characterized by high investment, high risk and small number of drilled wells. The core of geology-seismic  technique of reservoir prediction is close combination of geology and seismic technology,which has experienced two steps from step of frame, description and analogy to that of precision, genesis and dynamics, corresponding to the exploration from structural hydrocarbon reservoir to subtle hydrocarbon reservoir. In the second step, emphasis must be basically paid on the acoustic impedance difference of mudstone and sandstone in different facies, and the further forward modeling to ascertain geological significance of various seismic attributes. Emphasis must also be paid on relationships among seismic characteristics of different stratigraphy tracts, A/S ratio and different types of modern deltas. Therefore, sand body characteristics can be accurately described through section and plane characteristics of seismic profiles with clue to find subtle trap. The application of stratigraphy to seismic sedimentology embodies the two steps of geology-seismic technique, which contributes a lot to fast increasing of reserve of Bohai in recent years, and also improves the study of sedimentology and reservoir.

Key words: geology-seismic technique of reservoir prediction, sequence stratigraphy, seismic sedimentology, seismic attribute, Bohai offshore