侯连浪,刘向君,梁利喜,石新,马修刚,曹雯

• 1:西南石油大学油气藏地质及开发工程国家重点实验室
• 2:西南石油大学中石油测井重点实验室工程测井分室
• 3:川庆钻探工程有限公司
• 4:中国石油集团测井有限公司

摘要(Abstract)：

碳酸盐岩声波传播特征具有重要的应用价值，系统性地分析流体类型、流体压力、温度及围压对碳酸盐岩声波速度与频谱特性影响的研究仍需加强。选取四川盆地合川-潼南地区灯影组缝洞碳酸盐岩，开展了不同条件下的声波透射实验，分析了围压、孔隙压力、压力差、温度及流体类型对碳酸盐岩样品声波速度的影响及不同条件下透射声波的主频特征。研究结果表明：饱和地层水时声波速度对压力变化的敏感度较饱和氮气时低。压力变化过程中，声波速度变化幅度与岩样孔隙度为正相关关系。实验温度范围内，随着温度逐渐升高，饱和地层水、氮气岩心纵波速度、横波速度均小幅降低。当差应力较低时，通过改变孔隙压力来改变差应力的方式对应的声波速度大于通过改变围压来改变差应力方式对应的声波速度，当差应力较高时，结论相反。相同差应力条件下，声波速度对围压变化较孔隙压力变化更为敏感。定围压变孔隙压力与定孔压变围压曲线所对应的2条声波速度-差应力关系曲线的夹角及斜率差可定性反映岩样动态Biot有效应力系数相对大小。随着差应力增大，孔隙压力对有效应力的贡献逐渐降低。随着孔隙压力增大，纵波主频幅值、横波主频幅值均逐渐下降，随着围压增大，纵波主频幅值、横波主频幅值均逐渐增大，随着温度逐渐升高，纵波主频幅值、横波主频幅值均逐渐增大。研究结果有助于基于测井声波信息开展碳酸盐岩地层孔隙压力预测相关理论研究及工程应用。

关键词(KeyWords)： 碳酸盐岩;声波;压力;温度;频谱特征

Abstract:

Keywords:

基金项目(Foundation): 中国石油-西南石油大学创新联合体科技合作项目(2020CX040101);; 中石油科学研究与技术开发项目(2021DQ0107-11)

作者(Author): 侯连浪,刘向君,梁利喜,石新,马修刚,曹雯

DOI: 10.19509/j.cnki.dzkq.2022.0157

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