南海西沙海槽典型地震相识别与分析

西沙海槽区作为气水合物的可能聚集地越来越受到关注。浅析地震相分析方法，通过地震相标志的识别，归纳出自中中新世以来，西沙海槽发育有8种地震相：S形前积地震相、斜交前积地震相、下超型前积地震相、丘状地震相、杂乱地震相、空白地震相、透镜状地震相和席状地震相。较细致地描述了各种地震相的反射特征，并结合研究区的沉积背景，对不同地震相的沉积学特征做出了合理解释。

Identification and Analysis of Typical Seismic Facies of the Xisha Trough in the South China Sea

Xisha Trough attracts more and more attention of scientists because of its great potential for gas hydrate. The authors use the analysis method of shallow seismic facies to identify seismic facies, and come to the conclusion that since middle Miocene eight kinds of seismic facies have been developed in the Xisha Trough. They are S shaped foreset facies, oblique foreset facies, downlap foreset facies, mound seismic facies, chaotic seismic facies, blank seismic facies, lens and sheet facies. The reflection characteristics and depositional features of each seismic facies are introduced in the paper.