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天然气水合物地震响应研究——中国南海HD152测线应用实例 被引量:49

Studies of Seismic Characteristics about Gas hydrate:A Case Study of Line HD152 in the South China Sea
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摘要 目前识别水合物的主要依据是BSR和其上具有高速特征的空白带。当BSR不存在, 或由于水合物饱和度较高导致空白带特征不明显时, 水合物的识别是未解决的问题。针对这种情况, 提出了一种更实用的水合物识别模式: 低速背景中近似平行于海底的高速地质体是水合物带的特征, 水合物带泊松比降低, 利用纵横波速度信息易于识别水合物带下是否存在游离气。基于上述水合物的识别模式, 以中国南海HD152测线为实例进行了天然气水合物的识别研究。 Bottom simulating reflector(BSR) and amplitude blanking zone with high velocity above BSR are the indicators of hydrate. It is difficult to recognize hydrate when BSR isn't in existence or amplitude blanking is not obvious because of high hydrate concentration. A useful way of recognizing hydrate is presented to identify the seismic characteriscs of hydrate zone:the high velocity zone of paralleling bottom in the low velocity background is the indicator of hydrate zone,the Poisson's ratio of hydrate zone is lower,and sections of P-wave velocity and S-wave velocity can be used to detect free gas. A case study of line HD152 in the South China Sea is given.
出处 《现代地质》 CAS CSCD 北大核心 2005年第1期33-38,共6页 Geoscience
基金 国家"863"计划项目(2001AA611020) 国家重点基础研究发展规划项目(G20000467)
关键词 水合物 地震数据 纵波速度 横波速度 泊松比 中国南海 gas hydrate seismic data P-wave velocity S-wave velocity Poisson's ratio the South China Sea
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参考文献12

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