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| EXPERIMENTAL RESEARCH ON EFFECTS OF GAS SATURATION ON ACOUSTIC WAVE VELOCITY OF CARBONATE ROCK |
| ZHU Honglin，LIU Xiangjun，LIU Hong |
| (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu，Sichuan 610500，China) |
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Abstract The variations in the P- and S-wave velocities，the ratio of P-wave velocity to S-wave velocity(Vp/Vs) of carbonate rock with different gas saturations are studied by using the experimental methods. The results show as follows：(1) With the increase in gas saturation，the P-wave velocity and Vp/Vs both show a decreasing tendency，while S-wave velocity is almost unaffected. (2) The acoustic wave frequency has some influence on the acoustic wave velocity and Vp/Vs. The main distribution of Vp/Vs is varied with different frequencies，general rule is that Vp/Vs when Sg = 0% is greater than that when Sg = 100%. (3) Completely regarding water-saturated rock as the water zone，with the increase in gas content in water zone，the Vp/Vs will begin to decrease from the background value，the sharper decline illustrates transition from the water zone to the gas zone. Meanwhile，combining with the decreasing character of P-wave velocity，the theoretical basis for indicating gas zone utilizing acoustic logging data is settled. (4) Although Vp/Vs can offer some reference for identifying gas zone of carbonate rock，other relevant parameters must be combined to accurately assess the reservoir in practical application.
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Received: 10 May 2010
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2011, Vol. 30 
