裂缝性碳酸盐岩储层声波时差曲线的波动和增幅分析

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Analysis of Fluctuation and Amplitude Increase in Sonic Logs Caused by Fractures in Carbonate Rocks

FAN Xiao-min, LI Zhou-bo

College of GeoExploration Science and Technology，Jilin University，Changchun 130026，China

Received:2006-03-10 Revised:1900-01-01 Online:2007-01-26 Published:2007-01-26
Contact: FAN Xiao-min

Abstract

Abstract: Based on analysis of field logs, fluctuation and amplitude increase in sonic log caused by fractures in carbonate rocks are investigated. It is found that the attenuation of sonic waves by fractures leads to severe amplitude decrease at receivers far from the source. As a result, the travel time has an increase of 3～4 μs/ft. This attenuation mechanism successfully interprets the fluctuation and amplitude increase in sonic logs. Combined with electric and acoustical imaging logs, the conditions for the amplitude increase are investigated. The results show that fractures with lower angle and larger open-width lead to more significant increase in sonic logs.

Key words: fluctuation in sonic logs, increase in sonic logs, attenuation of P-wave, fractured reservoir

CLC Number:

P631.5

FAN Xiao-min, LI Zhou-bo. Analysis of Fluctuation and Amplitude Increase in Sonic Logs Caused by Fractures in Carbonate Rocks[J].J4, 2007, 37(1): 168-0173.

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