安岳—潼南地区须家河组地震相模式及其地质意义

Seismic Facies Models and Their Significance of Xujiahe Formation in Anyue-Tongnan Area

应用地震地层学理论和方法,结合露头和钻井资料,通过合成地震记录进行层位标定,将安岳—潼南地区须家河组划分为4个三级层序。建立了丘状和上超充填2种地震相模式。根据地震反射单元内部结构、外部形态、反射波终止类型、频率、振幅、连续性和层速度等多项地震参数,识别出平行—亚平行、丘状、充填、前积等5个大类地震相和亚平行波状变振幅低连续、上超充填等8个亚类地震相。利用过井地震剖面建立地震相与沉积相、测井相对应关系,分析地震相地质意义,预测了有利储集相带的分布。

Based on the theory and method of seismic stratigraphy in combination with synthetic seismogram calibration, Xujiahe Formation is divided into four third-order seismic sequences. Two primary seismic facies models （onlap fill seismic facies and mounded seismic facies） are established. According to seismic facies parameters such as interior structure, exterior shape of seismic reflection units, reflected wave termination types, frequency, amplitude, continuity, and bed velocity, five groups and eight sub-groups of seismic facies are identified. This study establishes correlation among seismic facies, sedimentary facies and log facies based on sedimentary microfacies on cross-well section, analyzes the significance of seismic facies, and predicts the distribution of the favorable sedimentary facies in this area.