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Shear Modulus Dispersion in Cracked and Fluid‐Saturated Quartzites: Experimental Observations and Modeling

机译:裂纹和流体饱和石英岩中的剪切模量分散:实验观察和建模

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Abstract > The effect of pore fluids on acoustic wave dispersion in rocks with low aspect ratio crack porosity is important for the interpretation of laboratory and field observations in hard rock mineral exploration environments. Here we make laboratory measurements of shear modulus dispersion at frequencies 0.01–1?Hz and at 1?MHz with different saturating fluids (dry, argon, and water saturated) in two thermally cracked quartzite samples with ~2% total porosity. Measurements are made across a range of effective pressures (10–150?MPa), with the resulting very low permeabilities of the samples varying from 1–300?×?10 ?21 ?m 2 . Moduli across the 0.01–1?Hz band were typically independent of frequency. The shear moduli measured at sub‐Hz frequencies are unaffected by fluid saturation, as expected for the saturated isobaric (Gassmann) regime. In marked contrast, water saturation of the cracked rocks results in very large increases in the shear moduli measured at 1?MHz and low effective pressures, indicative of saturated isolated conditions. Thus, at an effective pressure of 20?MPa, the shear moduli for the two water‐saturated quartzites increase by 74% and 98% from 1?Hz to 1?MHz. The contrast in elastic moduli between dry and water‐saturated conditions is well represented by the theoretical model developed by Walsh and others. The observed dispersion highlights the need for care in seismological application of results obtained at MHz frequencies from laboratory ultrasonic measurements. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译:</span><Abstract Type =“Main”XML:Lang =“en”> <标题类型=“main”>摘要</ title> >孔隙流体对具有低纵横比裂纹孔隙度的岩石中声波色散的影响很重要用于解释硬岩矿物勘探环境中的实验室和现场观测。在这里,我们在频率0.01-1℃和1℃下进行剪切模量分散的实验室测量。在两个热裂纹的石英岩样品中,在两个热裂纹的石英岩样品中具有不同的饱和流体(干燥,氩气和水),具有〜2%的总孔隙率。在一系列有效压力(10-150℃)的范围内进行测量,由此产生的样品的极低渗透率从1-300××10 Δ212</ sup> m 2 </ sup>。 Moduli跨越0.01-1?Hz频带通常与频率无关。根据饱和异物(Gassmann)制度的预期,在亚Hz频率下测量的剪切模量不受流体饱和的影响。在标记的对比中,裂化岩石的水饱和导致在1μmHz和低有效压力下测量的剪切模量的非常大的增加,指示饱和的分离条件。因此,在20≤MPa的有效压力下,两种水饱和石英的剪切模量增加了74%和98%,从1?Hz至1?MHz。干燥和水饱和条件之间的弹性模量的对比度是由沃尔什和其他人开发的理论模型提供的。观察到的分散体突出了在实验室超声测量中在MHz频率下获得的结果进行了处理的需要。 </ p> </ abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-34677/'>《Journal of geophysical research. Solid earth: JGR》</a> <b style="margin: 0 2px;">|</b><span>2018年第4期</span><b style="margin: 0 2px;">|</b><span>共16页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Schijns Heather&option=202" target="_blank" rel="nofollow">Schijns Heather;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jackson Ian&option=202" target="_blank" rel="nofollow">Jackson Ian;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Schmitt Douglas R.&option=202" target="_blank" rel="nofollow">Schmitt Douglas R.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Institute for Geophysical Research Department of PhysicsUniversity of AlbertaEdmonton Alberta Canada;</p> <p>Research School of Earth SciencesAustralian National UniversityCanberra ACT Australia;</p> <p>Institute for Geophysical Research Department of PhysicsUniversity of AlbertaEdmonton Alberta Canada;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dispersion&option=203" rel="nofollow">dispersion;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic&option=203" rel="nofollow">seismic;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=ultrasonic&option=203" rel="nofollow">ultrasonic;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rock physics&option=203" rel="nofollow">rock physics;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=cracks&option=203" rel="nofollow">cracks;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=hard rock&option=203" rel="nofollow">hard rock;</a> </p> <div class="translation"> 机译:分散;地震;超声波物理;裂缝;硬岩; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704025592426.html">Shear Modulus Dispersion in Cracked and Fluid‐Saturated Quartzites: Experimental Observations and Modeling</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Schijns Heather&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Schijns Heather,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jackson Ian&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Jackson Ian,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Schmitt Douglas R.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Schmitt Douglas R. </a> <a href="/journal-foreign-34677/" target="_blank" rel="nofollow" class="tuijian_authcolor">Journal of geophysical research. 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