AVO技术在裂缝性储层中的应用
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摘要
在油气勘探开发过程中,裂缝性油气藏所占的比例越来越大。裂缝性地层表现出很强的各向异性,勘探难度很大。而AVO技术从早先所认识到的一种现象已发展成一种完善的地球物理勘探技术,被广泛应用到油气勘探领域。当地层出现一定方位的裂缝时,地层的弹性参数会表现出方向性差异,这种差异能被AVO方法有效地检测。理论上讲,裂缝对地震属性参数的影响在垂直裂缝走向的方向上表现为最强,在水平裂缝走向的方向上表现为最弱,对AVO属性参数的影响也是如此。
The proportion of fractured reservoir is getting greater and greater during petroleum exploration and development. Fractured formations show a very strong anisotropy,causing great difficulty in exploration. Amplitude versus offset (AVO) technique,which has been developed into a perfect geophysical exploration technique from an early-recognized phenomenon,is widely used for oil and gas exploration. When the fractures with a certain azimuthal angle occur in formation,the elastic parameters of strata show a directional difference,which can be effectively detected through the AVO analysis. Theoretically,the influence of fracture on seismic attribute parameter is the strongest in the direction of vertical fractures and the influence is the weakest in the direction of horizontal fractures. The impact of fracture on AVO attribute parameter is also same.
The proportion of fractured reservoir is getting greater and greater during petroleum exploration and development. Fractured formations show a very strong anisotropy,causing great difficulty in exploration. Amplitude versus offset (AVO) technique,which has been developed into a perfect geophysical exploration technique from an early-recognized phenomenon,is widely used for oil and gas exploration. When the fractures with a certain azimuthal angle occur in formation,the elastic parameters of strata show a directional difference,which can be effectively detected through the AVO analysis. Theoretically,the influence of fracture on seismic attribute parameter is the strongest in the direction of vertical fractures and the influence is the weakest in the direction of horizontal fractures. The impact of fracture on AVO attribute parameter is also same.
引文
[1]朱广生.地震资料储层预测方法[M].北京:石油工业版社,1995:92-106.
[2]陆孟基.地震勘探原理[M].北京:石油工业出版社,1993:340-360.
[3]殷八斤.AVO技术的理论与实践[M].北京:石油工业出版社,1995.
[4]莫午零,吴朝东.裂缝性储层AVO模型研究[J].天然气工业,2007,27(2):43-45.
[5]贺保卫,潘仁芳,莫午零,等.用AVO方法从定性到半定量检测砂岩含气性[J].断块油气田,2005,12(1):19-20.
[2]陆孟基.地震勘探原理[M].北京:石油工业出版社,1993:340-360.
[3]殷八斤.AVO技术的理论与实践[M].北京:石油工业出版社,1995.
[4]莫午零,吴朝东.裂缝性储层AVO模型研究[J].天然气工业,2007,27(2):43-45.
[5]贺保卫,潘仁芳,莫午零,等.用AVO方法从定性到半定量检测砂岩含气性[J].断块油气田,2005,12(1):19-20.
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