马克兰俯冲带海域水合物高分辨率地震数据处理及初步成果  

High-resolution seismic data processing and preliminary results for gas hydrates in the Makran subduction zone

作　　者：刘斌[1,2] 李柯良 邓希光 黄建宇[1] 周大森 郭武 LIU Bin;LI Keliang;DENG Xiguang;HUANG Jianyu;ZHOU Dasen;GUO Wu(Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510760,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China)

机构地区：[1]自然资源部海底矿产资源重点实验室,中国地质调查局广州海洋地质调查局,广州510075 [2]南方海洋科学与工程实验室(广州),广州511458

出　　处：《海洋地质前沿》2022年第1期80-84,共5页Marine Geology Frontiers

基　　金：中国地质调查局项目(DD20190582,DD20191009)。

摘　　要：综合地球物理调查表明,北印度洋阿拉伯海马克兰俯冲带海域水合物资源非常丰富。为调查该海域水合物及与其相关的流体活动,采集了高分辨率多道地震数据,分析了原始地震数据的特征,并按照常规水合物地震数据处理流程进行处理,获得了较好的处理效果。基于新采集处理的地震数据,识别出了经典的BSR、非经典的BSR及双BSR现象。双BSR的发现表明该海域的水合物处在一个复杂的动态过程中,对该海域水合物的研究具有重要意义。由于本次地震数据的排列长度较短(最大排列长度1 300 m),对该海域水合物的定量分析以及精细刻画受到了限制。结合此次采集的短排列数据以及理论公式分析了排列长度对水合物勘探的影响,指出在水合物的勘探中,除了震源能量、频率、道间距等参数外,排列长度也是一个需要优化设计的参数。Integrated geophysical survey has revealed that the Makran subduction zone in the northern Indian Ocean is rich in hydrates resources. Recently, high-resolution multi-channel seismic data have been collected by the authors to investigate hydrates and hydrates-related fluid activities in the area. We analyzed the characteristics of the original seismic data, processed the data following a standard data processing flow, and obtained good results. Using the newly collected and processed seismic data, we have not only identified the classical BSR, but also found the phenomena of non-classical BSR and double BSR. The presence of double BSR indicates that the hydrate in this sea area is in a complex dynamic manner, which may have significant implications for gas hydrate investigation in the area. Owing to the short offset of the seismic data, which is only 1 300 m in maximum, the quantitative analysis and fine characterization of hydrate in this area are limited. In this paper, the influence of offset on hydrate exploration is analyzed based on the data of short offset collected from this survey as well as the theoretical formula. It is suggested that the offset is also a parameter which needs to be optimized in hydrate exploration.

关 键 词：水合物 马克兰俯冲带 短排列 高分辨率地震 似海底反射 

分 类 号：P744.4[天文地球—海洋科学] P631.443