基于地震AVO属性的煤层气富集区预测
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摘要
为了判定AVO技术是否能够用于对煤层气的预测,研究了煤储层含气性与地震AVO属性之间的关系,获得煤储层参数与地震波弹性参数之间的关系式及其AVO响应特征,发现煤储层的含气量随纵波速度、横波速度、密度的增大而减小。对鄂尔多斯盆地大宁—吉县地区5#煤层进行了AVO数值模拟,并预测出其煤层气的相对富集区。AVO数值模拟结果表明,高产井所在的煤储层一般有较强的AVO异常。结论认为:利用AVO属性能够对煤层气的富集区进行预测并为煤层气井位的部署提供依据。
In order to identify if the AVO technology can be also used for the prediction of coalbed methane gas,this paper studies the relationship between gas potential of coal beds and its AVO attributes.A relational expression between coal reservoir parameters and seismic wave elasticity parameters is established and their AVO responses are defined.It is discovered that the gas content of coal reservoirs is decreasing with the increase of P-and S-wave velocities as well as density.The AVO numerical simulation is performed on the coal bed 5# in the Daning-Jixian area of the Ordos Basin to predict the relative CBM enrichment zones.The simulation results show that the coal reservoirs with high-yielding wells generally show relatively strong AVO abnormal phenomena.Field application shows that AVO attributes can be used to predict CBM enrichment zones,thus providing a robust basis for CBM well emplacement.
In order to identify if the AVO technology can be also used for the prediction of coalbed methane gas,this paper studies the relationship between gas potential of coal beds and its AVO attributes.A relational expression between coal reservoir parameters and seismic wave elasticity parameters is established and their AVO responses are defined.It is discovered that the gas content of coal reservoirs is decreasing with the increase of P-and S-wave velocities as well as density.The AVO numerical simulation is performed on the coal bed 5# in the Daning-Jixian area of the Ordos Basin to predict the relative CBM enrichment zones.The simulation results show that the coal reservoirs with high-yielding wells generally show relatively strong AVO abnormal phenomena.Field application shows that AVO attributes can be used to predict CBM enrichment zones,thus providing a robust basis for CBM well emplacement.
引文
[1]RAMOS A C B,朱海龙.在煤甲烷储层中应用三维AVO分析和模拟作裂缝探测[J].石油物探译丛,1998(3):59-73.
[2]孙斌,王宪花,陈彩虹,等.鄂尔多斯盆地大宁—吉县地区煤层气分布特征[J].天然气工业,2004,24(5):17-20.
[3]王红岩,刘洪林,赵庆波,等.煤层气富集成藏规律[M].北京:石油工业出版社,2005.
[4]刘蔚,诸葛月英,朱宇清,等.大宁—吉县地区煤层气测井综合研究[J].天然气工业,2004,24(5):45-47.
[5]李五忠,赵庆波,吴国干,等.中国煤层气开发与利用[M].北京:石油工业出版社,2008:73-100.
[6]DOMENICO S N.Effect of water saturation on seismic re-flectivity of sand reservoirs encased in shale[J].Geophys-ics,1974,39(6):759-769.
[7]SHUEY R T.A si mplification of the Zoeppritz Equation[J].Geophysics,1985,50(4):609-614.
[8]彭苏萍,高云峰,杨瑞召,等.AVO探测煤层瓦斯富集的理论探讨和初步实践——以淮南煤田为例[J].地球物理学报,2005,48(6):1475-1485.
[9]彭苏萍,高云峰.含煤地层振幅随偏移距变化正演模型研究[J].科学通报,2005,50(增刊1):131-137.
[2]孙斌,王宪花,陈彩虹,等.鄂尔多斯盆地大宁—吉县地区煤层气分布特征[J].天然气工业,2004,24(5):17-20.
[3]王红岩,刘洪林,赵庆波,等.煤层气富集成藏规律[M].北京:石油工业出版社,2005.
[4]刘蔚,诸葛月英,朱宇清,等.大宁—吉县地区煤层气测井综合研究[J].天然气工业,2004,24(5):45-47.
[5]李五忠,赵庆波,吴国干,等.中国煤层气开发与利用[M].北京:石油工业出版社,2008:73-100.
[6]DOMENICO S N.Effect of water saturation on seismic re-flectivity of sand reservoirs encased in shale[J].Geophys-ics,1974,39(6):759-769.
[7]SHUEY R T.A si mplification of the Zoeppritz Equation[J].Geophysics,1985,50(4):609-614.
[8]彭苏萍,高云峰,杨瑞召,等.AVO探测煤层瓦斯富集的理论探讨和初步实践——以淮南煤田为例[J].地球物理学报,2005,48(6):1475-1485.
[9]彭苏萍,高云峰.含煤地层振幅随偏移距变化正演模型研究[J].科学通报,2005,50(增刊1):131-137.
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