HTI介质的方位AVO正演研究
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摘要
根据Schoenberg的含裂隙介质的线性滑移模型理论,建立了1个两层模型,模型的上层为各向同性均匀介质,下层为含垂直定向排列裂缝介质(HTI介质)。然后在不同裂缝密度下,针对干裂缝和饱含流体的裂缝两种情况,分别对模型分界面上的地震波方位AVO进行了数值模拟,研究了裂缝密度、裂缝方位、裂缝填充物对AVO的影响。结果表明,对上覆各向同性介质的含垂直裂隙介质界面AVO结果影响最大的是岩性,其次是裂缝流体,然后是裂缝方位,裂缝密度的影响最小。研究结果为利用振幅变化信息预测裂缝提供了依据。
According to Schoenberg's linear-slip model theory of fractured media,a two-layer model was built,the upper layer is isotropic homogeneous media,and the under layer is the HTI media with vertically aligned fracture.Then,with different fracture density,aiming at dry fracture and fluid-saturated fracture,the azimuthal AVO on model interface was simulated,and searching the impact of fracture density,fracture azimuth and fracture fillings on AVO.The result shows that for this model the biggest impact on AVO at interface is lithology,fluid is next,fracture azimuth is smaller,and the smallest one is fracture density.The research result provides basis for the fracture prediction by AVO information.
According to Schoenberg's linear-slip model theory of fractured media,a two-layer model was built,the upper layer is isotropic homogeneous media,and the under layer is the HTI media with vertically aligned fracture.Then,with different fracture density,aiming at dry fracture and fluid-saturated fracture,the azimuthal AVO on model interface was simulated,and searching the impact of fracture density,fracture azimuth and fracture fillings on AVO.The result shows that for this model the biggest impact on AVO at interface is lithology,fluid is next,fracture azimuth is smaller,and the smallest one is fracture density.The research result provides basis for the fracture prediction by AVO information.
引文
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[8]杨勤勇,赵群,王世星,等.纵波方位各向异性及其在裂缝检测中应用[J].石油物探,2006,45(2): 177-181
[9]朱培民,王家映,於文辉,等.用纵波AVO数据反演储层裂隙密度参数[J].石油物探,2001,40(2):1-12
[10]Mallick S,Craft K L,Meister L J,et al.Determination of the principal directional of azimuthal anisotropy from P-wave seismic data[J].Geophysics, 1998,63(2):692-706
[11]甘其刚,杨振武,彭大钧.振幅随方位角变化裂缝检测技术及其应用[J].石油物探,2004,43(4): 373-376
[12]Chichinina T,Sabinin V,Ronquillo-Jarillo G.P-wave attenuation anisotropy in fracture characterization: numerical modelling for reflection data[J].Expanded Abstracts of 74~(th) Annual Internat SEG Mtg,2004, 143-146
[13]Luo M,Evans B J.Fracture density estimations from amplitude data[J].Expanded Abstracts of 71~(st) Annual Internat SEG Mtg,2001,277-279
[14]Perea M A,Gibson R L,Toksoz M N.Detection of fracture orientation using azimuthal variation of Pwave AVO responses[J].Geophysics,1999,64(4): 1253-1265
[15]Ruger A.Variation of P-wave reflectiivity with offset and azimuth in anisotropic media[J].Geophysics, 1998,63(3):935-947
[16]Thomsen L.Elastic anisotropy due to aligned cracks in porous rock[J].Geophysical Prospecting,1995,43 (3):805-829
[17]牛滨华,吴有校,孙春岩.含流体和气体裂隙各向异性介质相速度特性[J].石油物探,1994,33(4): 39-48
[2]Hudson J A.Overall properties of a cracked solid [J].Mathematical Proceedings of the Cambridge Philosophical Society,1980,88(3):371-384
[3]Hudson J A.Wave speeds and attenuation of elastic waves in material containing cracks[J].Geophysical Journal of the Royal Astronomical Society,1981,64 (1):133-150
[4]Schoenberg M,Douma J.Elastic wave propagation in media with parallel fractures and aligned cracks[J]. Geophysical Prospecting,1988,36(6):571-590
[5]Schoenberg M,Sayers C M.Seismic anisotropy of fractured rock[J].Geophysics,1995,60(1):204-211
[6]吴萍,杨长春,王真理,等.HIT介质中的反射纵波方位属性[J].地球物理学进展,2009,42(3): 944-950
[7]朱兆林,赵爱国.裂缝介质的纵波方位AVO反演研究[J].石油物探,2005,44(5):499-503
[8]杨勤勇,赵群,王世星,等.纵波方位各向异性及其在裂缝检测中应用[J].石油物探,2006,45(2): 177-181
[9]朱培民,王家映,於文辉,等.用纵波AVO数据反演储层裂隙密度参数[J].石油物探,2001,40(2):1-12
[10]Mallick S,Craft K L,Meister L J,et al.Determination of the principal directional of azimuthal anisotropy from P-wave seismic data[J].Geophysics, 1998,63(2):692-706
[11]甘其刚,杨振武,彭大钧.振幅随方位角变化裂缝检测技术及其应用[J].石油物探,2004,43(4): 373-376
[12]Chichinina T,Sabinin V,Ronquillo-Jarillo G.P-wave attenuation anisotropy in fracture characterization: numerical modelling for reflection data[J].Expanded Abstracts of 74~(th) Annual Internat SEG Mtg,2004, 143-146
[13]Luo M,Evans B J.Fracture density estimations from amplitude data[J].Expanded Abstracts of 71~(st) Annual Internat SEG Mtg,2001,277-279
[14]Perea M A,Gibson R L,Toksoz M N.Detection of fracture orientation using azimuthal variation of Pwave AVO responses[J].Geophysics,1999,64(4): 1253-1265
[15]Ruger A.Variation of P-wave reflectiivity with offset and azimuth in anisotropic media[J].Geophysics, 1998,63(3):935-947
[16]Thomsen L.Elastic anisotropy due to aligned cracks in porous rock[J].Geophysical Prospecting,1995,43 (3):805-829
[17]牛滨华,吴有校,孙春岩.含流体和气体裂隙各向异性介质相速度特性[J].石油物探,1994,33(4): 39-48
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