基于蒙特卡洛方法的AVO属性定量分析研究

英文篇名：THE QUANTITATIVE ANALYSIS OF AVO ATTRIBUTS BASED ON MONTE CARLO METHOD
中文刊名：物探化探计算技术
英文刊名：Computing Techniques for Geophysical and Geochemical Exploration
作者：王兴建 ; 葛良全 ; 曹俊兴
英文作者：WANG Xing-jian1 ; GE Liang-quan1 ; CAO Jun-xing2(1.Chengdu University of Technology ; Chengdu 610069 ; China ; 2.College of Nuclear Technology and Automated Engineering ; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu 610069 ; China).
中文关键词：蒙特卡洛 ; AVO ; 概率 ; 定量分析
英文关键词：Monte Carlo ; AVO ; probability ; quantitative analysis
出版日期：2009-01-15
机构：成都理工大学核自院;成都理工大学"油气藏地质及开发工程"国家重点实验室;
年：2009
期：01
出版单位：物探化探计算技术

摘要

AVO属性分析可对碎屑岩沉积环境下的岩性流体性质进行识别,但由于存在一个大范围的岩性导制类似的AVO效应,预测只能定性分析。这里利用测井曲线进行趋势分析,可以得出不同岩性参数的概率密度函数,基于蒙特卡洛方法生成概率统计模型,按照不同深,能够得到砂岩不同流体的概率分布图。并且,对叠前地震数据提取目的层计算得到泊松比属性图,选取不同区域对模型得到的概率分布图进行校准;用贝叶斯公式计算不同流体的概率值,可以达到定量分析的目的。
AVO Attribute analysis can identify the lithology fluid property for the sandstone sedimentary environment.The prediction can merely make qualitative analysis because there are AVO effects of large-scale lithology guidance similarity.The paper uses the well logging curves to make trend analysis to obtain the probability density function of different lithology parameters,probability statistic model based Monte Carlo method and different fluid distribution map according to different depth.The the Poisson ratio attribute are graphed through computing the pre-stack seismic data of target layers and adjust the probability distribution map of models by selecting the different regions and the quantitative analysis are achieved by computing probability value of the different fluid using the Bayesian formula.

引文

[1]AKI K,RICHARDS P G.Quantitative seismology Theoryand method[M].W.H.Freeman and Co.1980.
    [2]FATTI J L,VAIL P J,SMITH G C,et al.Detection ofgas in sandstone reservoirs using AVO analysis:A3-Dseismic case history using the geostack technique[J].Geophysics,1994,59:1362.
    [3]GARDNER G H F,GARDNER L W,GREGORY A R.Formation velocity and density-the diagnostic basis forstratigraphic traps[J].Geophysics,1974,39:770.
    [4]HAMPSON D,RUSSELL B,CARDAMONE M.Uncer-tainty in AVO-How can we measure it[J].Recorder,2004,29(3):5.
    [5]HAMPSON D,RUSSELL B.AVO inversion:theory andpractice:60th Ann.Internat.Mtg[J].Soc Expl Geo-phys,Expanded Abstracts,1990:1456.
    [6]RUTHERFORD S R,WILLIAMS R H.Amplitude-ver-sus-offset variations in gas sands[J].Geophysics,1989,54:680.
    [7]SHUEY R T.A simplification of the Zoeppritz equations[J].Geophysics,1982,50:609.
    [8]MAVKO G,CHAN C,MUKERJI T.Fluid substitution:Estimating changes in Vp without knowing Vs[J].Geo-physics,1995,60:1750.