OBS在琼东南海域水合物矿体识别中的应用  

The application of OBS to the identification of hydrate in Qiongdongnan(southern Hainan)sea area

作　　者：徐云霞[1,2] 文鹏飞 张宝金 刘斌 XU Yun-Xia;WEN Peng-Fei;ZHANG Bao-Jin;LIU Bin(Guangzhou Marine Geological Survey,CGS,Guangzhou 510760,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China)

机构地区：[1]中国地质调查局,广州海洋地质调查局,广东广州510760 [2]南方海洋科学与工程广东省实验室(广州),广东广州511458

出　　处：《物探与化探》2020年第6期1276-1282,共7页Geophysical and Geochemical Exploration

基　　金：广东省自然资源厅项目(GDNRC[2020(45)]);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0207);中国地质调查局地质调查项目(DD20190224)。

摘　　要：OBS获得纵波和转换横波信息能够丰富地下构造的信息,获得与岩性、流体特征相关信息,减少水合物解释中的非唯一性。本文针对OBS资料采集的特点,利用重定位、重定向、波场分离、镜像偏移、RT旋转、转换横波偏移等技术获得纵波和转换横波的速度信息及共反射点成像结果;在此基础上进行纵波、转换横波联合反演,获得纵波阻抗、横波阻抗等结果,对此结果进行联合分析、解释,识别出真实、有利的游离气分布区域,提高了与水合物相关的流体特征的识别精度。OBS can enrich the information of the underground structure by obtaining the information of the P-wave and the PS wave,and can obtain the information related to the characteristics of the lithology and the fluid,and reduce the non-uniqueness in the interpretation of the hydrate.In this paper,according to the feature of OBS data,the authors obtained the PP and PS velocity information and common reflection point imaging by repositioning,redirection,wave field separation,mirror image migration,RT rotation,transversal wave migration and other techniques.On such a basis,the authors conducted the P-S wave joint inversion,obtained P-wave impedance as well as S-wave impedance.Through joint interpretation,the authors identified the true distribution area of free gas,and improved the recognition accuracy of fluid characteristics related to hydrates.

关 键 词：OBS 水合物 镜像偏移 转换横波偏移 纵横波联合反演 

分 类 号：P631.4[天文地球—地质矿产勘探]