Seismic low-frequency-based calculation of reservoir fluid mobility and its applications  

地震低频信息计算储层流体流度的方法及其应用(英文)

作　　者：陈学华[1,2] 贺振华[1,2] 朱四新 刘伟[2] 钟文丽[4] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]成都理工大学地球探测与信息技术教育部重点实验室,成都610059 [3]华北水利电力学院,郑州450011 [4]成都理工大学地球科学学院,成都610059

出　　处：《Applied Geophysics》2012年第3期326-332,362,共8页应用地球物理（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.41004054);the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2011ZX05023-005-010);the Research Fund for the Doctoral Program of Higher Education of China(No.20105122120002);supported by the Cultivating Program of Middle-aged Backbone Teachers of Chengdu University of Technology and the Cultivating Programme of Excellent Innovation Team of Chengdu University of Technology(Grang No.KYTD201002)

摘　　要：Low frequency content of seismic signals contains information related to the reservoir fluid mobility. Based on the asymptotic analysis theory of frequency-dependent reflectivity from a fluid-saturated poroelastic medium, we derive the computational implementation of reservoir fluid mobility and present the determination of optimal frequency in the implementation. We then calculate the reservoir fluid mobility using the optimal frequency instantaneous spectra at the low-frequency end of the seismic spectrum. The methodology is applied to synthetic seismic data from a permeable gas-bearing reservoir model and real land and marine seismic data. The results demonstrate that the fluid mobility shows excellent quality in imaging the gas reservoirs. It is feasible to detect the location and spatial distribution of gas reservoirs and reduce the non-uniqueness and uncertainty in fluid identification.地震信号的低频成分包含了与储层流体流度有关的信息,本文在含流体孔隙弹性介质依赖频率的反射系数渐近分析理论基础上,推导了储层流体流度的计算实现式,构建了低频段优势频率的确定方法,利用地震信号低频段优势频率的瞬时谱,实现了储层流体流度的直接计算。文中应用该方法分别处理了渗透性储层模型的合成地震记录,以及陆上和海上地震资料,结果表明:流体流度信息对于油气储层显示了良好的成像能力,可用于确定油气储层的位置及其空间展布,降低流体识别的多解性和不确定性。

关 键 词：fluid mobility seismic low-frequency reservoir characterization fluid identification instantaneous spectral decomposition 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]