海相油气地质Issue(3)：66-71,6.DOI:10.3969/j.issn.1672-9854.2014.03.009
西沙海域南部天然气水合物发育特征及成藏模式
Distribution Features and Accumulation Model of Natural Gas Hydrate in the South of Xisha Islands Seas, South China Sea
摘要
Abstract
According to the new 3D seismic data, three seismic identifications of natural gas hydrate are discovered in south of Xisha Islands seas, South China Sea: (1) Obvious bot om simulating reflector (BSR) shows strong amplitude and continuous reflection, opposite polarity in contrast to the seafloor reflection, and nearly paral el to sea floor and translayer phenomena. (2) There are blanking zones(BZ) accompanied with BSR. (3) Amplitude enhances versus increasing offset. Natural gas hydrate distributes in dispersive blocks in plane and gas hydrate enriches in center but gets reducing toward periphery within a single block. It is estimated that the stable zone of gas hydrate is about 120m thick. The result of geology analogy shows that gas hydrate accumulation is commonly effected by some conditions in-cluding gas source, temperature-pressure and structure-sedimentation. A geological model of gas hydrate accumu-lation is established.关键词
南海/西沙海域/天然气水合物/地震特征/控制因素/成藏模式Key words
Natural gas hydrate/Seismic feature/Controlling factor/Accumulation model/Xisha Islands seas分类
能源科技引用本文复制引用
杨涛涛,吕福亮,王彬,杨志力,鲁银涛,孙国忠..西沙海域南部天然气水合物发育特征及成藏模式[J].海相油气地质,2014,(3):66-71,6.基金项目
本文受国家重点基础研究发展计划（973计划）课题《南海深水盆地生物礁碳酸盐岩台地成因机理研究》（编号2009CB219406）和国家科技重大专项《西沙海域油气地质综合研究及有利勘探区》（编号2008ZX05025-004）共同资助 （）
