南海北部陆坡神狐海域水合物调查区新近系地震相与沉积相
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摘要
根据晚中新世以来南海发生的构造运动和莺琼盆地、珠江口盆地及全球海平面相对变化,结合地震反射终止关系将神狐海域水合物调查区新近系划分为8个地震层序。根据"外状内形"的基本原则,从地震波阻内部反射构造加上外部几何形态,辅以地震物理属性(视振幅、视频率、连续性)特征,在研究区共识别出充填状、丘状、席状、透镜状、滩状、楔状6类19种地震相。根据地震反射参数与沉积作用的对应关系,结合单井测井相,将本区地震相与沉积相进行转换,作出了T2以上4个三级层序平面沉积相展布图,并推断出底部4层地层的平面沉积相展布。对比已钻探的水合物深度,发现水合物主要围绕滑塌体富集。
According to the tectonic movement and global sea level changes in the South China Sea since Late Miocene,combining with seismic reflection terminating features,the Neogene in the hydrate survey area of the Shenhu region were subdivided into eight sequences.Following the principles of the "external shape and internal structure",i.e.the external geometry and the internal structure of the seismic reflection,plus seismic physical attributes,such as amplitude,frequency and consistence,six categories of seismic facies,i.e.the filled,mound,sheet,lens,flat,wedge-like shapes respectively and a total of 19 kinds of seismic subfacies were identified in the studying area.Sedimentary facies were interpreted from seismic facies based on the relationship between the seismic reflection parameters and sedimentary architecture as well as the single well log facies.Four maps of third-order sequences after T2 were compiled.Compared with the drilling data for gas hydrate,it is revealed that the gas hydrates are mainly enriched in slump deposits.
According to the tectonic movement and global sea level changes in the South China Sea since Late Miocene,combining with seismic reflection terminating features,the Neogene in the hydrate survey area of the Shenhu region were subdivided into eight sequences.Following the principles of the "external shape and internal structure",i.e.the external geometry and the internal structure of the seismic reflection,plus seismic physical attributes,such as amplitude,frequency and consistence,six categories of seismic facies,i.e.the filled,mound,sheet,lens,flat,wedge-like shapes respectively and a total of 19 kinds of seismic subfacies were identified in the studying area.Sedimentary facies were interpreted from seismic facies based on the relationship between the seismic reflection parameters and sedimentary architecture as well as the single well log facies.Four maps of third-order sequences after T2 were compiled.Compared with the drilling data for gas hydrate,it is revealed that the gas hydrates are mainly enriched in slump deposits.
引文
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[3]王嘹亮.南海北部神狐海域水合物钻探成果报告[R].广州:广州海洋地质调查局,2009.
[4]朱伟林,米立军,等.中国海域含油气盆地图集[M].北京:石油工业出版社,2010:102.
[5]徐怀大,王世凤,陈开远.地震地层学解释基础[M].武汉:中国地质大学出版社,1990:8.
[6]于兴河.碎屑岩系油气储层沉积学[M].2版.北京:石油工业出版社,2008:163.
[7]张志杰,于兴河.南海西沙海槽典型地震相识别与分析[J].海洋地质动态,2005,21(1):40-44,46.
[8]Weimer P.Sequence stratigraphy,facies geometries,anddepositional history of the Mississippi Fan,Gulf of Mexico[J].AAPG Bull.,1990,74(4):425-453.
[9]Stuart C J,Caughey C A.Seismic facies and sedimentologyof terrigenous Pleistocene deposits in northwest and centralGulf of Mexico[J].AAPG Memoir,1977,26:249-275.
[10]卢骏,刘震,张功成,等.南海北部小型海陆过渡相断陷地震相分析及沉积充填演化史研究——以琼东南盆地崖南凹陷崖城组为例[J].海洋地质前沿,2011,27(7):13-22.
[11]Schlunegger F,Leu W,Matter A.Sedimentary sequences,seismic facies,subsidence analysis,and evolution of theBurdigalian Upper Marine Molasse Group,central Switz-erland[J].AAPG Bulletin,1997,81(7):1 185-1 207.
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