Wide-azimuth Young's modulus inversion and fracture prediction: An example of H structure in Bozhong sag
WANG Jianhua1,2, ZHANG Jinmiao1,2, and WU Guochen3
1. CNOOC Research Institute Co., Ltd, Beijing 100028, China; 2. National Engineering Laboratory for Offshore Oil Exploration, Beijing 100028, China; 3. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China
Abstract：Buried hill structures are widely distributed in the Bohai Sea and the South China Sea. Affected by both structural stress and weathering corrosion, fractures are relatively developed in buried hills. As an important space for oil and gas storage and migration, fracture zones are key targets of oil and gas exploration in buried hills. Traditional fracture prediction based on seismic attributes has low accuracy due to the difference in AVO attri-butes between top and bottom layers. In this study, first based on the first-order perturbation approximation equation of HTI media and the relationships among elastic parameters, an azimuthal elastic impedance equation was derived, which is characterized by Young's modulus, Poisson's ratio and anisotropic parameters. Then the azimuthal elastic impedance inversion method was constructed according to the Bayesian theory, which avoids the influence of different AVO attributes on top and bottom layers. The reliability of inversion can be improved, and fracture prediction can be rea-lized by combining anisotropic inversion with azimuthal Young's modulus fitting. Finally, the method was used to predict the fracture development intensity and direction in the buried hills in the H structure of Bozhong sag. The data used is the first wide-azimuth data acquired offshore in China. The result has proved that the fracture prediction method is accurate and rational.
王建花, 张金淼, 吴国忱. 宽方位杨氏模量反演和裂缝预测方法及应用——以渤中凹陷H构造潜山勘探为例[J]. 石油地球物理勘探, 2021, 56(3): 593-602.
WANG Jianhua, ZHANG Jinmiao, and WU Guochen. Wide-azimuth Young's modulus inversion and fracture prediction: An example of H structure in Bozhong sag. Oil Geophysical Prospecting, 2021, 56(3): 593-602.
赵邦六,王喜双,董世泰,等.渤海湾盆地物探技术需求及发展方向[J].石油地球物理勘探,2014,49(2):394-409.ZHAO Bangliu,WANG Xishuang,DONG Shitai,et al.Geophysical prospecting requirement and development direction in Bohai Bay Basin[J].Oil Geophysical Prospecting,2014,49(2):394-409.
[2]
赵政璋,杜金虎,牛嘉玉,等.渤海湾盆地"中石油"探区勘探形势与前景分析[J].中国石油勘探,2005,10(3):1-7.ZHAO Zhengzhang,DU Jinhu,NIU Jiayu,et al.Exploration situations and prospects in PetroChina Blocks, Bohai Bay Basin[J].China Petroleum Exploration,2005,10(3):1-7.
[3]
Rüger A.Reflection Coefficients and Azimuthal AVO Analysis in Anisotropic Media[D].Colorado School of Mines,Colorado,1996.
Vavryčuk V,Pšenčík I.PP-wave reflection coefficients in weakly anisotropic elastic media[J].Geophysics,1998,63(6):2129-2141.
[6]
杜炳毅,杨午阳,王恩利,等.基于杨氏模量、泊松比和各向异性梯度的裂缝介质AVAZ反演方法[J].石油物探,2015,54(2):218-225.DU Bingyi,YANG Wuyang,WANG Enli,et al.AVAZ inversion based on Young's modulus,Poisson's ratio and anisotropy gradient in fractured media[J].Geophysical Prospecting for Petroleum,2015,54(2):218-225.
[7]
Wu G C,Zhao X L,Tang J,et al.First-order perturbation approximation for rock elastic moduli in transversely isotropic media[J].Science China(Earth Sciences),2017,60(9):1645-1654.
[8]
单俊臻,吴国忱,龚诚诚.HTI介质方位观测PP波反射系数一阶扰动近似[J].石油地球物理勘探,2019,54(2):371-379.SHAN Junzhen,WU Guochen,GONG Chengcheng.First-order perturbation approximation of PP wave reflection coefficient for HTI medium based on azimuthal geometry[J].Oil Geophysical Prospecting,2019,54(2):371-379.
[9]
Mallick S, Craft K L,Meister L J,et al.Determination of the principal directions of azimuthal anisotropy from P-wave seismic data[J].Geophysics,1998,63(2):692-706.
[10]
Grechka V,Tsvankin I.NMO-velocity surfaces and Dix-type formulas in anisotropic heterogeneous media[J].Geophysics,2002,67(3):939-951.
[11]
Downton J,Gray D.AVAZ parameter uncertainty estimation[C].SEG Technical Program Expanded Abstracts,2006,25:234-238.
[12]
王洪求,杨午阳,谢春辉,等.不同地震属性的方位各向异性分析及裂缝预测[J].石油地球物理勘探,2014,49(5):925-931.WANG Hongqiu,YANG Wuyang,XIE Chunhui,et al.Azimuthal anisotropy analysis of different seismic attributes and fracture prediction[J].Oil Geophysical Prospecting,2014,49(5):925-931.
[13]
孙炜,何治亮,李玉凤,等.改进的方位各向异性裂缝预测方法及其应用[J].石油地球物理勘探,2014,49(6):1170-1178.SUN Wei,HE Zhiliang,LI Yufeng,et al.An improved method of fracture prediction based on P-wave aniso-tropy and its application[J].Oil Geophysical Prospecting,2014,49(6):1170-1178.
[14]
孙炜,何治亮,李玉凤,等.基于HTI介质各向异性正演的裂缝预测属性优选[J].石油物探,2014,53(2):223-231.SUN Wei,HE Zhiliang,LI Yufeng,et al.Seismic attributes optimization for fractures prediction based on the anisotropy forwarding of the HTI media[J].Geophysical Prospecting for Petroleum,2014,53(2):223-231.
[15]
王康宁,孙赞东,侯昕晔.基于傅里叶级数展开的纵波方位各向异性裂缝预测[J].石油物探,2015,54(6):755-761.WANG Kangning,SUN Zandong,HOU Xinye.Fracture prediction by P-wave azimuthal anisotropy based on Fourier series decomposition[J].Geophysical Prospecting for Petroleum,2015,54(6):755-761.
林娟,娄兵,张淑萍,等.准噶尔盆地玛湖1井区高密度三维OVT域裂缝预测的应用[J].石油地球物理勘探,2017,52(增刊2):146-152.LIN Juan,LOU Bing,ZHANG Shuping,et al.Fracture prediction with the high-density 3D OVT domain in the Well Mahu 1 area,Junggar Basin[J].Oil Geophysical Prospecting,2017,52(S2):146-152.
[18]
熊金红,陈岑,曹占元,等.基于叠前地震全方位各向异性预测裂缝发育——以普光气田须家河组为例[J].地质力学学报,2017,23(2):280-287.XIONG Jinhong,CHEN Cen,CAO Zhanyuan,et al.Fracture development prediction based on azimuthal anisotropy analysis of pre-stack seismic:take Xujiahe formation of Puguang filed for example[J].Journal of Geomechanics,2017,23(2):280-287.
[19]
王景春,窦立荣,徐建国,等."两宽一高"地震资料在花岗岩潜山储层表征中的应用——以乍得邦戈盆地为例[J].石油地球物理勘探,2018,53(2):320-329.WANG Jingchun,DOU Lirong,XU Jianguo,et al.Granitic buried-hill reservoir characterization based on broadband,wide-azimuth and high-density seismic data:A case study of Bangor Basin in Chad[J].Oil Geophysical Prospecting,2018,53(2):320-329.
[20]
李春鹏.基于方位地震道集的裂缝型储层预测方法研究[D].山东青岛:中国石油大学(华东),2013.LI Chunpeng.Research on Fractured Reservoir Prediction with Azimuthal Seismic Data[D].China University of Petroleum,Qingdao,Shandong,2013.
[21]
Connolly P.Elastic impedance[J].The Leading Edge,1999,18(4):438-452.
[22]
Sayers C M.The effect of anisotropy on the Young's moduli and Poisson's ratios of shales[J].Geophysical Prospecting,2013,61(2):416-426.
[23]
宗兆云,印兴耀,张峰,等.杨氏模量和泊松比反射系数近似方程及叠前地震反演[J].地球物理学报,2012,55(11):3786-3794.ZONG Zhaoyun,YIN Xingyao,ZHANG Feng,et al.Reflection coefficient equation and pre-stack seismic inversion with Young's modulus and Poisson ratio[J].Chinese Journal of Geophysics,2012,55(11):3786-3794.
[24]
印兴耀,曹丹平,王保丽,等.基于叠前地震反演的流体识别方法研究进展[J].石油地球物理勘探,2014,49(1):22-34.YIN Xingyao,CAO Danping,WANG Baoli,et al.Research progress of fluid discrimination with pre-stack seismic inversion[J].Oil Geophysical Prospecting,2014,49(1):22-34.
[25]
罗辑,吴国忱,宗兆云,等.基于方位弹性阻抗反演的裂缝型储层流体检测方法[J].石油地球物理勘探,2015,50(6):1154-1165.LUO Ji,WU Guochen,ZONG Zhaoyun,et al.Fluid identification in fractured reservoirs based on azimu-thal elastic impedance inversion[J].Oil Geophysical Prospecting,2015,50(6):1154-1165.
[26]
闫蓓,王斌,李媛.基于最小二乘法的椭圆拟合改进算法[J].北京航空航天大学学报,2008,34(3):295-298.YAN Pei,WANG Bin,LI Yuan.Optimal ellipse fitting method based on least-squares principle[J].Journal of Beijing University of Aeronautics and Astronaut,2008,34(3):295-298.
[27]
Bakulin A,Grechka V,Tsvankin I.Estimation of fracture parameters from reflection seismic data,Part Ⅰ:HTI model due to a single fracture set[J].Geophy-sics,2000,65(6):1788-1802.
