| 泥岩、页岩声速各向异性及其影响因素分析 |
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| 引用本文： | 邓继新,史謌,刘瑞珣,俞军.泥岩、页岩声速各向异性及其影响因素分析[J].地球物理学报,2004,47(5):862-868. |
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| 作者姓名： | 邓继新 史謌 刘瑞珣 俞军 |
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| 作者单位： | 北京大学地球与空间科学学院,北京,100871;石油大学中国石油天然气集团公司(CNPC)地球物理勘探重点实验室,北京,102249;北京大学地球与空间科学学院,北京,100871 |
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| 基金项目： | 国家自然科学基金项目 ( 4 97742 3 9)，教育部重点实验室开放基金项目 (造山带与地壳演化 ) |
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| 摘 要： | 在实验室超声波频率下(纵波主频为700kHz、横波为250kHz)对层理发育的页岩和泥岩的各向异性进行了研究，给出了在干燥和油饱和条件下，样品不同方向上纵、横波速度以及各向异性参数随压力的变化规律. 用X 射线衍射和扫描电镜分析了样品中引起各向异性的原因，指出平行于层理定向排列的粘土矿物和微裂隙是使样品显示出强弹性各向异性的内在原因. 随着压力的增高微裂隙逐渐闭合，样品的各向异性程度减弱. 孔隙流体的存在增强了孔隙（裂隙）的刚度，减弱了各向异性随压力增大而减小的趋势.
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| 关 键 词： | 泥岩 页岩 超声波速度 各向异性 |
| 文章编号： | 0001-5733(2004)05-0862-07 |
| 收稿时间： | 2003-10-17 |
| 修稿时间： | 2004-4-12 |
Analysis of the velocity anisotropy and its affection factors in shale and mudstone |
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| DENG Ji-Xin , SHI Ge LIU Rui-Xun YU Jun School of Earth and Space Sciences,Peking University,Beijing ,China Geophysical Prospecting Key Laboratory.Analysis of the velocity anisotropy and its affection factors in shale and mudstone[J].Chinese Journal of Geophysics,2004,47(5):862-868. |
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| Authors: | DENG Ji-Xin SHI Ge LIU Rui-Xun YU Jun School of Earth and Space Sciences Peking University Beijing China Geophysical Prospecting Key Laboratory |
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| Institution: | 1.School of Earth and Space Sciences, Peking University, Beijing 100871, China 2 Geophysical Prospecting Key Laboratory (CNPC), University of Petroleum, Beijing102249, China |
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| Abstract: | The velocity anisotropy is examined in laminated shale and mudstone under the laboratory ultrasonic frequency. The variation patterns of wave velocity in different directions as a function of confining pressure are also presented for dry and oil-saturated situations. Using the X-ray diffraction technique and electron microprobe imaging, we make analysis and conclude that the clay minerals and microcracks are the intrinsic factors that result in such strong anisotropy in rock samples. With the increasing confining pressure, microcracks are gradually closed, which low the anisotropy. Pore fluid increases the pore rigidity thus decreases the tendency of anisotropy change with confining pressure. |
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| Keywords: | Mudstone Shale Ultrasonic velocity Anisotropy |
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