石油物探2018，Vol.57Issue(2)：186-197,12.DOI:10.3969/j.issn.1000-1441.2018.02.003
双相介质薄砂层的地震反射特征分析
Characteristic analysis of seismic reflections from a thin sand reservoir in two-phase media
摘要
Abstract
Based on the fact that hydrocarbon-bearing sand reservoirs are mostly thin beds in two-phase media,the elastic parameters,PP-wave and PS-wave seismic responses from a thin sand model are simulated using thin-bed reflection/transmission coefficient matrix equations and the Gassmann equation.The influences of incident-wave frequency,porosity,fluid type,and saturation on seismic reflections are analyzed.Simulation and analysis results show that,a higher frequency and a lower porosity result in higher amplitudes of thin-bed reflected PP-and PS-waves for fixed thin-bed polarity.In cases of low and medium porosities,the difference in seismic responses from the thin sand reservoir with different fluid types and saturations is very small.For high porosities,PP-wave amplitude shows an obvious gas-bearing anomaly.With the same porosity,the Poisson's ratio of gas-bearing sand reservoirs is smaller than that of non-gas-bearing sand reservoirs,and the Poisson's ratio of oil-bearing sand reservoirs is very similar to that of water-bearing reservoirs.This means that for the thin sand reservoir,it is reliable to distinguish whether the reservoir has gas or not using Poisson's ratio inversion,but there are not enough seismic anomalies to discern the oil-bearing case from the water-bearing case.关键词
砂岩储层/薄层/双相介质/流体替换/地震反射Key words
sand reservoir/thin bed/two-phase media/fluid substitution/seismic reflection分类
天文与地球科学引用本文复制引用
杨春,王赟,陈业全,张秉铭..双相介质薄砂层的地震反射特征分析[J].石油物探,2018,57(2):186-197,12.基金项目
国家自然科学基金项目(41604119,41425017,41374131,41574126,41504107)以及国家科技重大专项“薄层地震波场特征与反演研究”(2016ZX05002005-008)联合资助.This research is financially supported by the Natural Science Foundation of China (Grant Nos.41604119,41425017,41374131,41574126 and 41504107),and the National Science and Technology Major Project of China (Grant No.2016ZX05002005-008). （41604119,41425017,41374131,41574126,41504107）
