基于AVO反演的溶蚀孔洞型碳酸盐岩储层预测
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摘要
在塔里木盆地溶蚀孔洞型碳酸盐岩储层预测中,基于叠后资料以"串珠状"强反射为目标的传统手段难以弄清溶洞内充填状况,也无法识别不具"串珠状"反射特征的"内幕低阻抗"储层。本文以塔中45、中古21和轮古34三个井区为例,基于地震资料保幅处理和岩石物理分析,应用AVO反演预测了溶蚀孔洞型碳酸盐岩储层。相比传统叠后方法,AVO反演不仅能够分辨溶洞储层,而且能进一步判断其内部充填情况。此外,AVO反演还能识别不具"串珠状"强反射特征的"内幕低阻抗"储层。统计表明,AVO反演预测的结果与实际三个井区内全部33口井的吻合程度达91.3%。
Conventional methods are used for caved carbonate reservoir prediction on bead-like strong reflections of post-stack section in the Tarim Basin.However,the filling substances of caves cannot be distinguished,and the internal weak impedance reservoir without bead-like reflection is also neglected using these conventional methods.Based on seismic amplitude-preserved processing and rock physics analysis,pre-stack inversion is employed in this paper for caved carbonate reservoir prediction in Wells TZ45,ZG21and LG34zones.Comparing with conventional post-stack methods,AVO inversion can not only distinguish resolvable dissolution caves,but also predict the filling substances.Moreover,it can characterize the distribution of internal weak impedance reservoir without bead-like reflection.In practice,the coincidence of AVO inversion prediction with the drilling results of 33 wells in the zones is up to 91.3%.
Conventional methods are used for caved carbonate reservoir prediction on bead-like strong reflections of post-stack section in the Tarim Basin.However,the filling substances of caves cannot be distinguished,and the internal weak impedance reservoir without bead-like reflection is also neglected using these conventional methods.Based on seismic amplitude-preserved processing and rock physics analysis,pre-stack inversion is employed in this paper for caved carbonate reservoir prediction in Wells TZ45,ZG21and LG34zones.Comparing with conventional post-stack methods,AVO inversion can not only distinguish resolvable dissolution caves,but also predict the filling substances.Moreover,it can characterize the distribution of internal weak impedance reservoir without bead-like reflection.In practice,the coincidence of AVO inversion prediction with the drilling results of 33 wells in the zones is up to 91.3%.
引文
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[2]吴俊峰,姚姚,撒利明.碳酸盐岩特殊孔洞型构造地震响应特征分析.石油地球物理勘探,2007,42(2):180～185Wu Junfeng,Yao Yao and Sa Liming.Analysis on seis-mic response of special cavernous structure of carbonate.OGP,2007,42(2):180～185
[3]Zeng H L,Wang G Z and Janson X et al.Characterizingseismic bright spots in deeply buried,Ordovician Pal-eokarst strata,Central Tabei uplift,Tarim Basin,West-ern China.Geophysics,2011,76(4):127～137
[4]Zhang Y Y,Sun Z D,Yang H J et al.Pre-stack inver-sion for caved carbonate reservoir prediction:A casestudy from Tarim Basin,China.Petroleum Science,2011,8(4):415～421
[5]蒋春玲,敬兵,张喜梅等.利用叠前弹性参数反演储层参数.石油地球物理勘探,2011,46(3):452～456 Jiang Chunling,Jing Bing,Zhang Ximei et al.Reservoir parameter inversion with prestack elastic parameter.OGP,2011,46(3):452～456
[6]Sun Z D,Yang H J,Zhang Y Y et al.The application of amplitude-preserved processing and migration for carbon-ate reservoir prediction in Tarim Basin,China.Petrole-um Science,2011,8(4):406～414
[7]张津海,张远银,孙赞东.道集品质对叠前AVO/AVA同时反演的影响.石油地球物理勘探,2012,47(1):68～73 Zhang Jinhai,Zhang Yuanyin and Sun Zandong.The effect of seismic data conditioning on pre-stack AVO/AVA simultaneous inversion.OGP,2012,47(1):68～73
[8]Wang H Y,Sun Z D and Yang H J.Velocity prediction models evaluation and permeability prediction for frac-tured and caved carbonate reservoir:from theory to case study.SEG Technical Program Expanded Abstracts,2009,28:2194～2198
[9]Amir S and Larry L.A case study in the application of inversion methods to a Persian Gulf reservoir.SEGT ech-nical Program Expanded Abstracts,2010,29:2896～2900
[10]Daniel P H and Brian H R.Simultaneous inversion of pre-stack seismic data.SEG Technical Program Ex-panded Abstracts,2005,24:1633～1637
[2]吴俊峰,姚姚,撒利明.碳酸盐岩特殊孔洞型构造地震响应特征分析.石油地球物理勘探,2007,42(2):180～185Wu Junfeng,Yao Yao and Sa Liming.Analysis on seis-mic response of special cavernous structure of carbonate.OGP,2007,42(2):180～185
[3]Zeng H L,Wang G Z and Janson X et al.Characterizingseismic bright spots in deeply buried,Ordovician Pal-eokarst strata,Central Tabei uplift,Tarim Basin,West-ern China.Geophysics,2011,76(4):127～137
[4]Zhang Y Y,Sun Z D,Yang H J et al.Pre-stack inver-sion for caved carbonate reservoir prediction:A casestudy from Tarim Basin,China.Petroleum Science,2011,8(4):415～421
[5]蒋春玲,敬兵,张喜梅等.利用叠前弹性参数反演储层参数.石油地球物理勘探,2011,46(3):452～456 Jiang Chunling,Jing Bing,Zhang Ximei et al.Reservoir parameter inversion with prestack elastic parameter.OGP,2011,46(3):452～456
[6]Sun Z D,Yang H J,Zhang Y Y et al.The application of amplitude-preserved processing and migration for carbon-ate reservoir prediction in Tarim Basin,China.Petrole-um Science,2011,8(4):406～414
[7]张津海,张远银,孙赞东.道集品质对叠前AVO/AVA同时反演的影响.石油地球物理勘探,2012,47(1):68～73 Zhang Jinhai,Zhang Yuanyin and Sun Zandong.The effect of seismic data conditioning on pre-stack AVO/AVA simultaneous inversion.OGP,2012,47(1):68～73
[8]Wang H Y,Sun Z D and Yang H J.Velocity prediction models evaluation and permeability prediction for frac-tured and caved carbonate reservoir:from theory to case study.SEG Technical Program Expanded Abstracts,2009,28:2194～2198
[9]Amir S and Larry L.A case study in the application of inversion methods to a Persian Gulf reservoir.SEGT ech-nical Program Expanded Abstracts,2010,29:2896～2900
[10]Daniel P H and Brian H R.Simultaneous inversion of pre-stack seismic data.SEG Technical Program Ex-panded Abstracts,2005,24:1633～1637
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