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The Fluid Identification Forward Modeling Study of Carbonate Cave Reservoir

The fluid 
identification of carbonate reservoir is a key factor to hydrocarbon 
exploration and reservoir development. In order to simulate the seismic 
response characteristics of the cave in the carbonate reservoir, three sets of 
models were designed, including the caves varied in width, the caves filled 
with different solids, and the oil-gas-water model. The numerical simulation 
technique was used to carry out the forward modeling and the AVO (Amplitude 
varies with offset) response characteristics of the three groups of models were 
analyzed. The results show that the AVO characteristics can be observed when 
the cave reaches a certain extent in the horizontal direction. When the 
surrounding rock is constant, the absolute value of the intercept of the AVO curve 
increases with the Vp/Vs decrease. The AVO 
technology can effectively identify the gas cave. The effect is not obvious to 
water or oil cave.