OCCURRENCE OF METHANE HYDRATES OFFSHORE SOUTHERN MEXICO 1
OCCURRENCE OF METHANE HYDRATES OFFSHORE SOUTHERN MEXICO 1
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墨西哥南部近海出现甲烷水合物 1
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
T. Shipley
中科院分区：
文献类型：
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作者：
T. Shipley
在墨西哥南部大陆边缘的三个钻探点收集了天然存在甲烷水合物的证据。水合物要么表现为冰包裹体，要么更常见的表现为冻结的多孔火山灰和细砂与泥浆夹层。冰冻沉积物中冰包裹体和间隙水的产气量高达7 ml /ml左右。一个大样本立即放入一个密封的容器中，释放出大约20毫升的气体/毫升的水。所有这些值都比在原位条件下气体溶解度所能解释的要高。测得的热梯度使该区域的模拟底反射（BSR）非常接近甲烷水合物体系的相边界。这与早期的解释一致，即BSR与水合物/气相边界有关。
Evidence for naturally occurring methane hydrates was collected at three drill sites off the southern Mexico continental margin. The hydrates are manifested either by ice inclusions or, more often, as frozen porous volcanic ash and fine sands interlayered with muds. Gas generation from the ice inclusions and interstitial water of the frozen sediment was as high as about 7 ml of gas/ml of water. One large sample immediately placed in a sealed container released about 20 ml of gas/ml of water. All of these values are higher than may be accounted for by gas solubility at in situ conditions. Measured thermal gradients place the bottom-simulating reflection (BSR) in this area very near the phase boundary for the methane hydrate system. This is consistent with earlier interpretations that the BSR is related to the hydrate/gas phase boundary.