Anomalously Deep BSR Related to a Transient State of the Gas Hydrate System in the Western Black Sea

Ker S.; Thomas Y.; Riboulot V.; Sultan N.; Bernard C.; Scalabrin C.; Ion G.; Marsset B.

摘要

Abstract >A comprehensive characterization of gas hydrate system offshore the western Black Sea was performed through an integrated analysis of geophysical data. We detected the bottom‐simulating reflector (BSR), which marks, in this area, the base of gas hydrate stability. The observed BSR depth does not fit the theoretical steady state base of gas hydrate stability zone (BGHSZ). We show that the disparity between the BSR and predicted BGHSZ is the result of a transient state of the hydrate system due to the ongoing reequilibrium since the Last Glacial Maximum. When gas hydrates are brought outside the stability zone due to changes in temperature and sea level, their dissociation generates an increase in interstitial pore pressure. This process is favorable to the recrystallization of gas hydrates and delays the upward migration of the hydrate stability zone explaining the anomalously deep BSR. The BSR depth, which is commonly used to derive geothermal gradient values by assuming steady state conditions, is used here to derive the maximum excess pore pressure at the BGHSZ. Derived excess pore pressure values of 1–2?MPa are probably the result of the low permeability of hydrate‐bearing sediments. Higher pore pressure values derived at the location of a fault system could cause hydrofracturing enabling the free gas to cross the gas hydrate stability zone and emerge at the seafloor, forming the flares observed in close vicinity to where the shallow gas hydrates were sampled. </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”>抽象</ title> >通过对地球物理数据的综合分析进行了近海天然气水合物系统的综合表征。我们检测到底部模拟反射器（BSR），在该区域，气体水合物稳定性的基础上标记。观察到的BSR深度不适合天然气水合物稳定区（BGHSZ）的理论稳态基础。我们表明，BSR和预测的BGHSZ之间的视差是由于持续的冰川最大值以来，由于持续的重新验证，水合物系统的瞬态状态的结果。当由于温度和海平面的变化而在稳定区外，它们的解离产生了间质孔隙压力的增加。该过程有利于气体水合物的重结晶，并延迟水合物稳定区的向上迁移解释异常深的BSR。这里使用通常用于通过假设稳态条件来衍生地热梯度值的BSR深度来导出BGHSZ的最大孔隙压力。衍生的过量的孔隙压力值1-2？MPa可能是水合物沉积物的低渗透性的结果。在故障系统的位置衍生的较高的孔隙压力值可能导致水力安全性，使得自由气体能够穿过气体水合物稳定区并且在海底处出现，形成近距离观察到的浅气体水合物被取样的耀斑。</ P> </摘要> </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-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2019年第1期</span><b style="margin: 0 2px;">|</b><span>共18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=Ker S.&option=202" target="_blank" rel="nofollow">Ker S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Thomas Y.&option=202" target="_blank" rel="nofollow">Thomas Y.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Riboulot V.&option=202" target="_blank" rel="nofollow">Riboulot V.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sultan N.&option=202" target="_blank" rel="nofollow">Sultan N.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bernard C.&option=202" target="_blank" rel="nofollow">Bernard C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Scalabrin C.&option=202" target="_blank" rel="nofollow">Scalabrin C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ion G.&option=202" target="_blank" rel="nofollow">Ion G.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Marsset B.&option=202" target="_blank" rel="nofollow">Marsset B.;</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>Ifremer REM‐GMPlouzané France;</p> <p>Ifremer REM‐GMPlouzané France;</p> <p>Ifremer REM‐GMPlouzané France;</p> <p>Ifremer REM‐GMPlouzané France;</p> <p>Ifremer REM‐GMPlouzané France;</p> <p>Ifremer REM‐GMPlouzané France;</p> <p>GeoEcoMarBucharest Romania;</p> <p>Ifremer REM‐GMPlouzané France;</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=gas hydrate&option=203" rel="nofollow">gas hydrate;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=BSR&option=203" rel="nofollow">BSR;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=excess pore pressure&option=203" rel="nofollow">excess pore pressure;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Black Sea&option=203" rel="nofollow">Black Sea;</a> </p> <div class="translation"> 机译：天然气水合物;BSR;过量的孔隙压力;黑海; </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/0704023360817.html">Anomalously Deep BSR Related to a Transient State of the Gas Hydrate System in the Western 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