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。
Abstract:
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.
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