地震属性在海洋天然气水合物识别中的应用  

Application of Seismic Attributes in the Identification of Marine Gas-hydrate

作　　者：王伟巍 伍忠良[1,2] 龚跃华 吴世敏[3] WANG Wei-wei;WU Zhong-liang;GONG Yue-hua;WU Shi-min(Key Laboatory of Marine Mineral Resources,Ministry of Land and Resources,Guangzhou 510760,Guangdong Province,China;Guangzhou Marine Geological Survey of China Geological Survey,Guangzhou 510760,Guangdong Province,China;Sun Yat-sen University,Guangzhou 510275,Guangdong Province,China)

机构地区：[1]自然资源部海底矿产资源重点实验室,广东广州510760 [2]中国地质调查局广州海洋地质调查局,广东广州510760 [3]中山大学,广东广州510275

出　　处：《海洋技术学报》2020年第3期75-81,共7页Journal of Ocean Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2018YFC0310000,2013AA092501)。

摘　　要：海洋拖缆主动源多道地震技术是应用于海洋天然气水合物资源调查的主要技术方法。不同于常规油气藏勘探,海底天然气水合物成藏机制复杂多样,海底似反射(Bottom Simulating Reflector,BSR)特征与水合物赋存并非完全对应。为提高海洋天然气水合物矿体识别的可靠性,地震属性技术在水合物资源调查中发挥着越来越重要的作用。本文对我国南海北部海域天然气水合物调查中的关键属性进行了对比、分析及筛选试验研究。试验针对海洋高分辨多道三维地震数据,采用三维地震层速度控制综合处理技术完成了BSR区域的成像,提取了与BSR相关的多种地震属性,并对BSR地震属性体的内部特性进行了分析,实现了BSR特征水合物矿体的识别,并提取了BSR上方和下部结合层带的地震属性。研究结果表明,在水合物赋存地层极其复杂的条件下,地震属性分析技术在海洋复杂浅地层水合物识别方面具有可行性和技术优势。The marine active source and multi-channel seismic technology is the main technical method applied to the investigation of marine gas-hydrate resources.Different from conventional petrol and gas reservoir exploration,the mechanism of gas-hydrate accumulation is complex and diverse,and the characteristics of bottom simulating reflector(BSR)are not completely corresponding to the occurrence of gas-hydrate.In order to improve the reliability of gas-hydrate ore identification,seismic attribute technology is playing an increasingly important role in gas-hydrate resource investigation.In this paper,the key properties of gas-hydrate have been compared and analyzed in the northern South China Sea.Aiming at the marine high-resolution multi-channel three-dimensional seismic data,the comprehensive processing technology of three-dimensional seismic layer velocity control is used to complete the region imaging of BSR,it has extracted a variety of seismic attributes related to BSR,analyzed the internal characteristics of BSR seismic attribute body,realized the recognition of hydrate ore body with BSR characteristics,and extracted the seismic attributes of the upper and lower combined layer zones of BSR.The results show that the gas-hydrate occurrence strata are extremely complex,and indicate the feasibility and technical advantages of seismic attribute analysis technology in the identification of complex shallow marine gas-hydrate.

关 键 词：天然气水合物 三维地震 海底似反射 地震属性 

分 类 号：P743.4[天文地球—海洋科学]