Abstract
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.
Highlights
Carbonate cave reservoirs have good hydrocarbon-bearing properties and are an important oil carrier
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
Summary
Carbonate cave reservoirs have good hydrocarbon-bearing properties and are an important oil carrier. Han Gehua [5] established a carbonate cave reservoir imaging technique based on the characteristics of the Ordovician reservoirs in the Tahe Oilfield, with the pre-stack time migration and the target layer fine processing technology as the core. This technique provides detailed basic information for carbonate cave reservoir prediction. The numerical simulation of cross-grid high-order finite difference method is carried out, and the seismic response characteristics of carbonate cave reservoirs filled with different fluids are analyzed by AVO (amplitude versus offset). By using the numerical simulation technology to obtain the seismic records of the three groups of models and analyzing the AVO response characteristics, the fluid properties in the carbonate caverns are identified
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