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首页> 外文期刊>Marine Geology >Formation of subsurface shallow gas accumulations in Amurskiy Bay (Peter the Great Bay, Sea of Japan) as a result of postglacial sea-level change, paleoceanographic conditions and hydrological activity
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Formation of subsurface shallow gas accumulations in Amurskiy Bay (Peter the Great Bay, Sea of Japan) as a result of postglacial sea-level change, paleoceanographic conditions and hydrological activity

机译：冰川后海平面变化，古海洋条件和水文活动导致阿穆斯基湾（日本海彼得大帝湾）地下浅层气藏的形成

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We present new data on the study of subsurface gas accumulations in the sediments of Amurskiy Bay (the Sea of Japan). Geophysical research (single-channel continuous seismic profiling with airguns and high-resolution acoustic investigations with a high-frequency GeoPulse profiler) shows that the bay depression is filled by Pre Quaternary sediments that are at least 0.8 s (TWT) thick and overlaying Late Pleistocene-Holocene sediments that are up to 30 m thick. The Pre-Quaternary deposits are possibly represented by coal-containing Mesozoic and Cenozoic rocks. Gas-related acoustic anomalies were found in the Late Pleistocene-Holocene silty sediments in the northern part of the bay. These gas-related anomalies have been divided into blanket column, turbidity and pillar anomalies. A single pockmark was also observed in the bottom relief of the bay. The gas accumulation area in the sediments is 19 km long and 12 km wide. The degassing of the Pre-Quaternary coal-containing deposits is assumed to be the major cause of gas. The formation of most of the gas anomalies in the Late Pleistocene-Holocene sediments and the trigger mechanism of gas migration may be associated with sea-level changes, paleoceanographic conditions, sedimentation features and the hydrodynamic regime in the bay. Increases in the number of diatoms and the presence of aberrant forms of some silicoflagellates have been observed in areas with high gas contents. Areas with numerous small underwater elevations or mounds were distinguished in the bay. In the northern part of the bay, the mounds correspond to ostraceous reefs or other local shellfish colonies. In the southern part of the bay, the elevations could be related to methane-derived authigenic carbonates, which formed pavements for the fixation of shellfish colonies and construction of reefs. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们提供了有关Amurskiy湾（日本海）沉积物中地下天然气成藏研究的新数据。地球物理研究（使用气枪进行单通道连续地震剖面分析和使用高频GeoPulse剖面仪进行高分辨率声学研究）表明，海湾凹陷被厚度至少为0.8 s（TWT）的第四纪前沉积物充满，并覆盖了晚更新世。 -全新沉积物，厚度可达30 m。第四纪前沉积可能以含煤的中生代和新生代岩石为代表。在海湾北部的晚更新世-全新世粉质沉积物中发现了与气体有关的声音异常。这些与气体有关的异常已分为盖层异常，浊度异常和柱状异常。在海湾的底部浮雕中也观察到一个麻子。沉积物中的天然气聚集区长19公里，宽12公里。季前含煤沉积物的脱气被认为是产生天然气的主要原因。晚更新世-全新世沉积物中大部分气体异常的形成和气体迁移的触发机制可能与海平面的变化，古海洋条件，沉积特征和海湾的水动力状况有关。在高气体含量的地区已经观察到硅藻数量的增加和某些硅鞭毛虫的异常形式的存在。海湾地区有许多水下小海拔或丘陵的地区。在海湾的北部，这些土墩对应于礁或其他当地贝类群落。在海湾的南部，这些高程可能与甲烷源的自生碳酸盐有关，碳酸盐形成了固定贝类群落和铺筑礁石的铺面。 （C）2015 Elsevier B.V.保留所有权利。

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