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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裂缝性碳酸盐岩储层声波时差曲线的波动和增幅分析

范晓敏,李舟波

吉林大学地球探测科学与技术学院，长春 130026

收稿日期:2006-03-10 修回日期:1900-01-01 出版日期:2007-01-26 发布日期:2007-01-26
通讯作者: 范晓敏

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

摘要/Abstract

摘要： 研究了裂缝性碳酸盐岩储层声波时差曲线的波动和增幅现象，认为是裂缝对声波的衰减导致到达远接收器的初至波幅度降低，因而形成3～4μs/ft的时差增幅，从而有效解释了声波时差曲线的波动和增幅现象。利用成像资料和常规测井资料相结合，研究增幅发生条件和规律，发现低角度、较大开度的裂缝导致时差增幅。

关键词: 声波时差曲线波动, 时差增幅, 纵波衰减, 裂缝性储层

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

中图分类号:

P631.5

范晓敏,李舟波. 裂缝性碳酸盐岩储层声波时差曲线的波动和增幅分析[J]. J4, 2007, 37(1): 168-0173.

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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