Three term AVO approximation of Kf-Km-ρ and prestack seismic inversion for deep reservoirs
Yin Xingyao1, Wang Huixin1,2, Cao Danping1, Zhou Qijie1, Guo Shuwen3
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China; 3. Research Institute of Exploration and Development, Dagang Oilfield, PetroChina, Tianjin 300280, China
Abstract:With deeply buried targets,information of large incident angles is deficient.Conventional fluid factors are not sensitive enough to discriminate fluid in reservoirs due to the deep compaction.So a more sensitive fluid indicator aiming at small incident angle is needed to be built for deep reservoir.With the characteristics of rock physics,we derive a new three term AVO approximation in terms of pore-fluid bulk modulus Kf,which is more sensitive to hydrocarbon,dry rock matrix term fm,and density ρ.The accuracy of the new approximation is almost equivalent to exact Zoeppritz equation.Consequently the new approximation can meet the requirements of inversion.In addition,tests on synthetic data show that the pore-fluid bulk modulus Kf can be reliably estimated from the prestack seismic data.We built a flow path of extracting pore-fluid bulk modulus Kf by elastic impedance inversion for deep reservoirs with small incident angles.And the proposed method is proved to be accuracy,reliable and feasible after real data tests.
印兴耀, 王慧欣, 曹丹平, 周琦杰, 郭淑文. 利用三参数AVO近似方程的深层叠前地震反演[J]. 石油地球物理勘探, 2018, 53(1): 129-135.
Yin Xingyao, Wang Huixin, Cao Danping, Zhou Qijie, Guo Shuwen. Three term AVO approximation of Kf-Km-ρ and prestack seismic inversion for deep reservoirs. Oil Geophysical Prospecting, 2018, 53(1): 129-135.
印兴耀,张世鑫,张峰.针对深层流体识别的两项弹性阻抗反演与Russell流体因子直接估算方法研究.地球物理学报,2013,56(7):2378-2390.Yin Xingyao,Zhang Shixin,Zhang Feng.Two-term elastic impedance inversion and Russell fluid factor direct estimation method for deep reservoir fluid identification.Chinese Journal of Geophysics,2013,56(7):2378-2390.
[2]
刘晓晶,印兴耀,吴国忱等.基于基追踪弹性阻抗反演的深部储层流体识别方法.地球物理学报,2016,59(1):277-286.Liu Xiaojing,Yin Xingyao,Wu Guochen et al.Identification of deep reservoir fluids based on basis pursuit inversion for elastic impedance.Chinese Journal of Geophysics,2016,59(1):277-286.
[3]
Yin Xingyao and Zhang Shixin.Bayesian inversion for effective pore-fluid bulk modulus based on fluid-matrix decoupled amplitude variation with offset approximation.Geophysics,2014,79(5):R221-R232.
[4]
Nur A,Mavko G,Dvorkin J et al.Critical porosity:A key to relating physical properties to porosity in rocks.The Leading Edge,1998,17(3):357-362.
[5]
Batzle M,Hofmann R,Han D H et al.Fluids and frequency dependent seismic velocity of rocks.The Leading Edge,2001,20(2):168-171.
[6]
Han Dehua and Batzle M L.Gassmann's equation and fluid-saturation effects on seismic velocities.Geophysics,2004,69(2):398-405.
[7]
Connolly P.Elastic impedance.The Leading Edge,1999,18(4):438-452.
[8]
Whitcombe D N.Elastic impedance normalization.Geo-physics,2002,67(1):60-62.
[9]
Nicolao A D,Drufuca G,Rocca F.Eigen values and eigenvectors of linearized elastic inversion.Geophy-sics,1993,58(5):670-679.
[10]
Dillon L,Schwedersky G,Vásquez G et al.A multi-scale DHI elastic attributes evaluation.The Leading Edge,2003,22(10):1024-1029.
[11]
印兴耀,李超,张世鑫.基于双相介质的地震流体识别.中国石油大学学报(自然科学版),2013,37(5):38-43.Yin Xingyao,Li Chao,Zhang Shixin.Seismic fluid discrimination based on two-phase media theory.Journal of China University of Petroleum (Edition of Natural Science),2013,37(5):38-43.
[12]
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.石油地球物理勘探,2014,49(1):22-34,46.Yin Xinygao,Cao Danping,Wang Baoli et al.Research progress of fluid discrimination with pre-stack seismic inversion.OGP,2014,49(1):22-34,46.
[13]
印兴耀,宗兆云,吴国忱.岩石物理驱动下地震流体识别研究.中国科学:地球科学,2015,01:8-21.Yin Xingyao,Zong Zhaoyun,Wu Guochen.Research on seismic fluid identification driven by rock physics.Science China Earch Sciences,2015,58:159-171.
[14]
印兴耀,刘欣欣.储层地震岩石物理建模研究现状与进展.石油物探,2016,55(3):309-325.Yin Xingyao,Liu Xinxin.Research status and progress of the seismic rock-physics modeling methods.GPP,2016,55(3):309-325.
[15]
Russell B H,Gray D,Hampson D P.Linearized AVO and poroelasticity.Geophysics,2011,76(3):C19-C29.
[16]
Shuey R.A simplification of the Zoeppritz equations.Geophysics,1985,50(4):609-614.
[17]
Smith G,Gidlow P.Weighted stacking for rock property estimation and detection of gas.Geophysical Prospecting,1987,35(9):993-1014.
[18]
Quakenbush M,Shang B,Tuttle C.Poisson impedance.The Leading Edge,2006,25(2):128-138.
[19]
Gray D.Elastic inversion for Lamé parameters.SEG Technical Program Expanded Abstracts,2002,21.
[20]
Biot M A.Theory of propagation of elastic waves in a fluid-saturated porous solidⅡ:Higher frequency range.Journal of the Acoustical Society of America,1956,28(2):179-191.
[21]
Russell B H,Hedlin K,Hilterman F J et al.Fluid-property discrimination with AVO:A Biot-Gassmann perspective.Geophysics,2003,68(1):29-39.
[22]
Russell B H,Gray D,Hampson D P et al.Linearized AVO and poroelasticity.CREWES Research report,2006,18:1-25.
[23]
邓炜,印兴耀,宗兆云.等效流体体积模量直接反演的流体识别方法.石油地球物理勘探,2017,52(2):315-325.Deng wei,Yin Xingyao,Zong Zhaoyun.Fluid identification based on direct inversion of equivalent fluid bulk modulus.OGP,2017,52(2):315-325.
[24]
印兴耀,张世鑫,张繁昌等.利用基于Russell近似的弹性波阻抗反演进行储层描述和流体识别.石油地球物理勘探,2010,45(3):373-380.Yin Xingyao,Zhang Shixin,Zhang Fanchang et al.Utilizing Russell approximation based elastic wave impedance inversion to conduct reservoir description and fluid identification.OGP,2010,45(3):373-380.