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首页> 外文期刊>Marine Geophysical Researches >A preliminary study on morphology and genesis of giant and mega pockmarks near Andu Seamount, Nansha Region (South China Sea)
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A preliminary study on morphology and genesis of giant and mega pockmarks near Andu Seamount, Nansha Region (South China Sea)

机译：南沙地区（南海南海）附近的巨型和巨型巨型形态和成因初步研究

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摘要

Pockmarks consists of depressions on the seafloor and are often considered to originate from fluid escape activities. In this study, we report 125 pockmarks near the Andu Seamount in the southern margin of the South China Sea (SCS) and preliminarily investigate their genesis based on multi-beam bathymetry and multichannel seismic reflection data. Most of them are giant and mega pockmarks and display circular, elliptical, elongated, crescent, comet and irregular shapes on a plan-view. The mapped pockmarks cover a total surface of 291.354 km(2). Most of them occur in strings or clusters, while some are isolated. The filled volume of pockmark is calculated for the first time in this region, which may have significant implications for sedimentary process. Beneath most of the pockmarks, high-angle faults, high-amplitude reflections, filled-up structures and other fluid escape features are imaged on seismic sections. The structural settings, especially the fault systems, may control the genesis and development of pockmarks in this area. We also speculate that seabed gradients may contribute to generation of crescent pockmarks. According to seismic sections, sediment types and morphological analysis, we finally proposed that the genesis of these pockmarks may mainly be triggered by gas escape activities in the study area. This work may have important implications for the gas exploration in the Nansha Region, southern South China Sea.
机译：Pockmarks由海底的凹陷组成，通常被认为是源于流体逃生活动。在这项研究中，我们在南海（SCS）的南部边缘附近的125座穴位附近报告了125个麻雀，并根据多光束沐浴族和多通道地震反射数据初步调查它们的成因。其中大多数是巨型和Mega Pockmarks，并在平面图上显示圆形，椭圆形，伸长，新月形，彗星和不规则形状。映射的Packmarks覆盖了291.354公里的总表面（2）。其中大多数发生在字符串或集群中，而有些则被隔离。在该区域的第一次第一次计算填充量的Pockmark，这可能对沉积过程产生重大影响。在大多数麻袋中，高角度故障，高幅度反射，填充结构和其他流体逃生功能在地震部分上成像。结构设置，尤其是故障系统，可以控制该地区麻疹的成因和发展。我们还推测海底梯度可能有助于生成新月袋。根据地震切片，沉积物类型和形态学分析，我们最终提出了这些麻木的成因可能主要由研究区域的气体逃逸活动引发。这项工作可能对南海南海南沙地区的天然气勘探有重要意义。

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