南海珠江口盆地东部海域含似海底反射沉积层纵波速度结构: 反射波旅行时反演结果

doi:10.11978/2015144

热带海洋学报 ›› 2016, Vol. 35 ›› Issue (6): 29-35.doi: 10.11978/2015144CSTR: 32234.14.2015144

南海珠江口盆地东部海域含似海底反射沉积层纵波速度结构: 反射波旅行时反演结果

刘斌¹, 耿建华²

1. 国土资源部海底矿产资源重点实验室广州海洋地质调查局, 广东广州 510075;
2. 同济大学海洋地质国家重点实验室, 上海 200092

收稿日期:2015-11-30 修回日期:2016-04-06 出版日期:2016-11-30 发布日期:2016-12-15
作者简介:作者简介：刘斌(1988-), 男, 工程师, 主要从事水合物调查, OBS数据处理与反演研究。E-mail: liugele@163.com
基金资助:
同济大学海洋地质国家重点实验室开放基金(MGK1406)

Velocity structure of bottom simulating reflector-bearing sediment layers in the eastern Pearl River Mouth Basin of the South China Sea: Results from reflection travel time inversion

LIU Bin¹, GENG Jianhua²

1. Key Laboratory of Marine Mineral Resource, Ministry of Land and Resource, Guangzhou Marine Geological Survey, Guangzhou 510075, China;
2. State Key Laboratory of Marine Geology in Tongji University, Shanghai 200092, China

Received:2015-11-30 Revised:2016-04-06 Online:2016-11-30 Published:2016-12-15
Contact: Liu Bin. E-mail: liugele@163.com
Supported by:
Open Fund Project of State key Laboratory of Marine Geology Tongji University (MGK1406)

摘要/Abstract

摘要： 文章利用2012年广州海洋地质调查局在南海珠江口盆地东部海域采集的多道地震(MCS), 通过反射波旅行时反演了含似海底反射(BSR)沉积层的纵波速度结构。从反演的速度结构上, 我们发现BSR上方附近速度在横向上变化较大, 存在一个明显的相对高速区域(1800~2200m•s^-1)以及一个相对低速的区域(1500~1700m•s^-1)。结合多道地震成像的结果, 我们把相对高速区域解释为含水合物层, 而相对低速区域可能不含水合物或者仅含少量的水合物。BSR一般认为是水合物稳定存在区域的底界面, 反演的速度结构结果表明水合物在稳定带内分布不稳定、不连续。相对低速区域的存在可能表明该低速区域下的BSR与水合物的赋存无关, 仅仅反映了正常沉积地层与下伏游离气层的界面。

关键词: 水合物, 似海底反射, 反射旅行时反演, 纵波速度结构

Abstract: This paper reports the velocity structure of bottom simulating reflector (BSR) -bearing sediment layers from the reflection travel time inversion, using the data acquired in 2012 by Guangzhou marine geological survey in the eastern Pearl River Mouth Basin of the South China Sea. The results show great lateral variation in velocity, namely, there exist a relatively high velocity zone (1800~2200 m•s^-1) and a relatively low velocity zone. Combed with the Multi-channel seismic (MCS) image, we interpret the relatively high velocity zone as gas hydrate-bearing sediments, and the relatively low velocity zone as sediments with no gas hydrate or little gas hydrate. BSR is often considered as the base of gas hydrate stability zone (GHSZ), and our results suggest that gas hydrate has irregular distribution in the stability zone. The relatively low velocity zone indicates that the BSR below may not be associated with gas hydrate, only reflecting the boundary between the normal sediments above and the free gas-bearing sediments below.

Key words: gas hydrate, bottom simulating reflector, reflection travel time inversion, P wave velocity structure

刘斌, 耿建华. 南海珠江口盆地东部海域含似海底反射沉积层纵波速度结构: 反射波旅行时反演结果[J]. 热带海洋学报, 2016, 35(6): 29-35.

LIU Bin, GENG Jianhua. Velocity structure of bottom simulating reflector-bearing sediment layers in the eastern Pearl River Mouth Basin of the South China Sea: Results from reflection travel time inversion[J]. Journal of Tropical Oceanography, 2016, 35(6): 29-35.

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南海珠江口盆地东部海域含似海底反射沉积层纵波速度结构: 反射波旅行时反演结果

Velocity structure of bottom simulating reflector-bearing sediment layers in the eastern Pearl River Mouth Basin of the South China Sea: Results from reflection travel time inversion

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