层理对页岩纵波特性的影响

doi:10.12108/yxyqc.20190318

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (3): 152–160.doi: 10.12108/yxyqc.20190318

• 石油工程 • 上一篇

层理对页岩纵波特性的影响

李贤胜^1,2, 刘向君^1,2, 熊健^1,2, 李玮¹, 梁利喜²

1. 西南石油大学地球科学与技术学院, 成都 610500;
2. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500

收稿日期:2018-12-21 修回日期:2019-01-24 出版日期:2019-05-21 发布日期:2019-05-06
第一作者:李贤胜(1996-),男,西南石油大学地球科学与技术学院在读硕士研究生,研究方向为岩石物理及测井。地址:(610500)四川省成都市新都区新都大道8号西南石油大学地球科学与技术学院。Email:201821000182@stu.swpu.edu.cn。
基金资助:
国家自然科学基金项目“水岩作用对硬脆性页岩孔隙结构及声波特性影响的研究”（编号：41872167）和“富有机质硬脆性页岩水化机理基础研究”（编号：41772151）联合资助

Influence of bedding on compressional wave characteristics of shales

LI Xiansheng^1,2, LIU Xiangjun^1,2, XIONG Jian^1,2, LI Wei¹, LIANG Lixi²

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Received:2018-12-21 Revised:2019-01-24 Online:2019-05-21 Published:2019-05-06

摘要/Abstract

摘要： 研究层理性页岩声波响应特征有助于利用声波测井资料指导页岩气井安全钻井。采集四川盆地长宁地区下志留统龙马溪组露头页岩岩样，并沿不同角度钻取页岩岩心。基于多频声波测试系统，开展了多层理角度下页岩声波实验，分析了层理角度对纵波速度、衰减系数、时域、频域等特性的影响。开展了数值模拟实验，分析了岩心端面垂直时平行层理面、层理密度对波速、衰减的影响。结果表明：随着层理角度增大声波时差、声波衰减系数均线性增大；声波速度存在频散现象，测试频率不同，声波速度不同；声波速度与层理密度呈线性负相关；层理角度对页岩声波主频没有影响。该研究结果为页岩气井安全钻井及压裂改造等工程设计提供了参考。

关键词: 页岩, 层理角度, 层理密度, 声波, 龙马溪组, 四川盆地

Abstract: Studying the acoustic characteristics of layered shales contributes to applying acoustic logging to guide drilling safely. The shale samples were collected from the Lower Silurian Longmaxi Formation in Changning area of Sichuan Basin, and drilled into cores along different orientation relative to the bedding plane. Based on multi-frequency ultrasonic wave testing system, acoustic wave experiments of shale samples were carried out and the influences of bedding angle on acoustic wave velocity, attenuation coefficient, time domain and frequency domain were analyzed. Numerical simulation experiments were carried out to analyze the influences of bedding density on wave velocity and attenuation in parallel and vertical core end faces. The results show that the interval transit time and the attenuation coefficient increase linearly with the increase of bedding angle. Frequency dispersion phenomenon exists, which shows that the acoustic velocity varies with the testing frequency. Acoustic velocity is negatively correlated with bedding density, and bedding angle has no effect on the dominant frequency of shale acoustic waves. The results provide a reference for the drilling and fracturing engineering of shale gas wells.

Key words: shale, bedding angle, bedding density, acoustic wave, Longmaxi Formation, Sichuan Basin

中图分类号:

TE132

李贤胜, 刘向君, 熊健, 李玮, 梁利喜. 层理对页岩纵波特性的影响[J]. 岩性油气藏, 2019, 31(3): 152–160.

LI Xiansheng, LIU Xiangjun, XIONG Jian, LI Wei, LIANG Lixi. Influence of bedding on compressional wave characteristics of shales[J]. Lithologic Reservoirs, 2019, 31(3): 152–160.

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层理对页岩纵波特性的影响

Influence of bedding on compressional wave characteristics of shales

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