各向异性假设条件下三维VSP与地面地震数据旅行时差分析及参数求取

英文篇名：Travel time-difference analysis and parameter extraction for 3D VSP data and surface seismic data in anisotropic media
中文刊名：石油地球物理勘探
英文刊名：Oil Geophysical Prospecting
作者：孙祥娥 ; 凌云 ; 高军 ; 孙德胜 ; 林吉祥
英文作者：Sun Xiang-e1 ; 2 ; 3 ; Ling Yun1 ; Gao Jun1 ; Sun De-sheng1 and Lin Ji-xiang1. 1. Geophysical Technique Research Centre ; BGP Inc. of CNPC ; Zhuozhou City ; Hebei Province ; 072750 ; China2. Post-Doc Station of BGP Inc. of CNPC ; Zhuozhou City ; Hebei Province ; 072750 ; China3. Electronics & Information School of Yangtze University ; Jingzhou City ; Hubei Province ; 434023 ; China
中文关键词：三维VSP ; 全方位地面地震 ; VTI ; HTI ; 各向异性参数
英文关键词：3-D VSP ; all-direction surface seismic exploration ; VTI (vertical transverse isotropy) ; HTI(horizontal transverse isotropy) ; anisotropic parameter
出版日期：2009-12-15
机构：东方地球物理公司油藏地球物理研究中心;东方地球物理公司博士后工作站;长江大学电信学院;
年：2009
期：06
出版单位：石油地球物理勘探

摘要

由于本文研究对象处在T4(3200m)以上,地层构造相对平缓,速度场空间变化较小,断裂或裂缝方向发育单一,因此从VTI介质和HTI介质的假设条件出发,研究了利用三维VSP数据和地面地震数据联合求解各向异性参数的方法,分析了HTI介质的空变特点。研究结果表明:研究区的介质具有明显的VTI性质和HTI特点,通过求取VTI各向异性参数和分析HTI介质的空间相对变化,获得了较小的地震波旅行时时差。根据HTI介质空间相对变化与实际裂缝空变具有一定的一致性的特点,可进行裂缝储层的有效预测。
The target zone in this paper is above T4 (3200ms),the stratum-structure is relatively flat,and there is not much change for velocity field,and the faults and fractures develop in one direction,based on the hypotheses of VTI media and HTI media,the method of integrating 3D VSP data with surface seismic data to solve anisotropic parameters is studied in this paper,and the characteristics of the spatial change for HTI media was analyzed. The study results show that the media in the study area obviously have the VTI properties and HTI features,by estimating VTI anisotropic parameters and analyzing HTI spatial relative change,less seismic wave travel time difference was obtained. Based on consistence characteristic between space relative change for HTI media and space change for real fractures,the fracture reservoir can be effectively predicted.

引文

[1]Helbig K and Thomsen L.75-plus years of anisotropy in exploration and reservoir seismics:A historical re-view of concepts and methods.Geophysics,2005,70(6):9~23
    [2]BerrymanJ G.Long-wave elastic anisotropyintransverse-lyisotropic media.Geophysics,1979,44(5):896~917
    [3]Crampin S.Shear-wave polarizations:Aplea for three-component recording.Expanded Abstracts of53rd SEG Mtg,1983,425~428
    [4]Helbig K.Elliptical anisotropy-its significance and meaning.Geophysics,1983,48(7):825~832
    [5]Helbig K.Anisotropy and dispersion in periodically layered media.Geophysics,1984,49(4):364~373
    [6]Tsvankin I and Thomsen L.Nonhyperbolic reflection moveout in anisotropic media.Geophysics,1994,59(8):1290~1304
    [7]Alkhalifah T and Tsvankin I.Velocity analysis for transversely isotropic media.Geophysics,1995,60(5):1550~1566
    [8]Schoenberg M and Sayers C M.Seismic anisotropy of fractured rock.Geophysics,1995,60(1):204~211
    [9]Bakulin A V et al.Esti mation of fracture parameters fromreflection seismic data-PartⅠ:HTI model due to a single fracture set.Geophysics,2000,65(6):1788~1802