<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Priyank Jaiswal</dc:contributor>
  <dc:contributor>Seth S. Haines</dc:contributor>
  <dc:contributor>Yihong Yang</dc:contributor>
  <dc:contributor>Patrick E. Hart</dc:contributor>
  <dc:creator>Jiliang Wang</dc:creator>
  <dc:date>2020</dc:date>
  <dc:description>&lt;div id="125397548" class="article-section-wrapper js-article-section js-content-section  " data-section-parent-id="0"&gt;&lt;p&gt;The Gulf of Mexico (GOM) Joint Industry Project Leg 2 logging-while-drilling data in Walker Ridge lease block 313 (WR313) in the GOM detected gas hydrate in coarse- and fine-grained sediments at sites WR313-G and WR313-H. The coarse-grained units are thin (&lt;span class="inline-formula no-formula-id"&gt;⁠&lt;span class="MathJax_Preview"&gt;&lt;span id="MJXp-Span-1" class="MJXp-math"&gt;&lt;span id="MJXp-Span-2" class="MJXp-mrow"&gt;&lt;span id="MJXp-Span-3" class="MJXp-mo"&gt;&amp;lt;&lt;/span&gt;&lt;span id="MJXp-Span-4" class="MJXp-mn"&gt;10&lt;/span&gt;&lt;span id="MJXp-Span-5" class="MJXp-mtext"&gt;  &lt;/span&gt;&lt;span id="MJXp-Span-6" class="MJXp-mi"&gt;m&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;⁠&lt;/span&gt;) and highly saturated, whereas the fine-grained unit is thick (approximately 200&amp;nbsp;m) with low saturation and fracture-filling gas hydrate. Unlike its coarse-grained counterpart, the seismic character of the fine-grained unit does not clearly indicate the presence of gas hydrate, which would likely have remained undiscovered in the absence of drilling. In this paper, through frequency-domain acoustic full-waveform inversion (FWI) of ocean-bottom seismometer data along a 2D multichannel seismic transect near sites WR313-G and WR313-H, we detect and quantify gas hydrate in the fine-grained unit. Key results are as follows: First, the base of the gas hydrate stability zone, which is not obvious in the reflection profile, can be discerned in the FWI results. Second, the gas hydrate in the fine-grained unit is mainly confined to the area between two sets of opposite-dipping normal faults implying that the fault architecture may be partially responsible for this gas hydrate accumulation and distribution.&lt;/p&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1190/INT-2018-0165.1</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Society of Exploration Geophysicists</dc:publisher>
  <dc:title>Gas hydrate quantification in Walker Ridge block 313, Gulf of Mexico, from full-waveform inversion of ocean-bottom seismic data</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>