利用地震属性进行砂岩储层横向预测
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摘要
地震属性分析技术一直是地震特殊处理和地质解释的主要研究内容。随着相关理论的发展,地震属性分析技术已经应用到油气勘探开发的各个阶段。S盆地南部处于勘探开发的前期,具有井少、二维地震测网较稀、储层预测难的特点。由于沉积地层的变化能引起地震波在动力学和运动学上的相应变化,因此利用地震属性能较好地进行储层特征的定性研究,即通过地震多种属性分析,进行研究区内砂岩储层横向预测。其研究技术路线实际上为先找储层,再进行初步油气检测,最后进行勘探目标优选。根据这个技术路线,地震属性的研究则相应地以三个方面的分析为主:即利用振幅属性来寻找砂体富集区,利用有效带宽判断砂层的均质性,再利用频率属性判断其含气性。地震属性分析方法的应用在早期天然气勘探开发具有可以推广的普遍意义。
The seismic attribute analysis technology is always main research content of seismic special processing and the interpretation.Along with correlation theory development,The seismic attribute analysis technology already be applied each period.S basin can be described by stronger heterogeneity,small number of wells,larger spaces 2D seismic lines and more difficult reservoir prediction during earlier stage exploring.The seismic wave can change with sediment stratum variety,so application of seismic attributes analysis can predict the advantage reservoir with no using well constrained,that is,applying seismic attributes to sandstone reservoir lateral prediction.By using of geologic statistics method,three seismic attributes are chosen,they are average absolute amplitude,average instantaneous frequency and effective bandwidth.Absolute amplitude is used to search rich sandstone area.The broad effective bandwidth indicates non-uniform reflectivity suggesting complicated bedding: narrow bandwidth indicates simpler and smoother reflection character suggesting uniform bedding patterns.In some situations,gas-saturated sands attenuate higher seismic frequencies,causing anomalously low average instantaneous frequencies coincident with RMS amplitude anomalies(bright spots or dim spots).The application of seismic attributes analysis provided an important proof in exploration and making plan.
The seismic attribute analysis technology is always main research content of seismic special processing and the interpretation.Along with correlation theory development,The seismic attribute analysis technology already be applied each period.S basin can be described by stronger heterogeneity,small number of wells,larger spaces 2D seismic lines and more difficult reservoir prediction during earlier stage exploring.The seismic wave can change with sediment stratum variety,so application of seismic attributes analysis can predict the advantage reservoir with no using well constrained,that is,applying seismic attributes to sandstone reservoir lateral prediction.By using of geologic statistics method,three seismic attributes are chosen,they are average absolute amplitude,average instantaneous frequency and effective bandwidth.Absolute amplitude is used to search rich sandstone area.The broad effective bandwidth indicates non-uniform reflectivity suggesting complicated bedding: narrow bandwidth indicates simpler and smoother reflection character suggesting uniform bedding patterns.In some situations,gas-saturated sands attenuate higher seismic frequencies,causing anomalously low average instantaneous frequencies coincident with RMS amplitude anomalies(bright spots or dim spots).The application of seismic attributes analysis provided an important proof in exploration and making plan.
引文
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[2]鲍祥生,尹成,赵伟,等.储层预测的地震属性优选技术研究[J].石油物探,2006,45(1):28.
[3]邹新宁,孙卫,张盟勃,等,地震属性分析在岩性气藏描述中的应用[J].吉林大学学报:地球科学版,2006(36):3.
[4]李玉君,邓宏文,师振贵,等,地震信息在储层沉积微相随机建模中的应用[J].特种油气藏,2007,14(5):43.
[5]魏艳,尹成,丁峰,等.地震多属性综合分析的应用研究[J].石油物探,2007,46(1):42.
[6]王香文,于常青,董宁,等,储层综合预测技术在颚尔多斯盆地定北区块的应用[J].石油物探,2006,45(3):5.
[7]白斌,周立发,丁国栋,等.储层综合预测技术在太康地区上古生界的应用[J].石油物探,2007,46(3):261.
[8]王鑫.地震属性技术在王73地区储层预测中的应用[J].石油物探,2007,46(3):272.
[9]杨占龙,彭立才,陈启林,等.地震属性分析与岩性油气藏勘探[J].石油物探,2007,46(2):131.
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