AVO检测方法在广安气田须六段气层的应用
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摘要
为了搞清楚储层含流体性质、指导四川盆地广安气田开发井位的部署,在已钻井储层岩石物理分析和模型正演研究的基础上,通过对实际地震资料近、远道叠加剖面振幅变化特征的对比和叠前道集分析,结合AVO属性反演剖面,总结出了广安气田上三叠统须六段储层含气的典型特征:①低密度和低泊松比;②在共中心点道集上反射振幅随炮检距的增大而增强;③远道叠加剖面上的振幅明显比近道振幅强;④AVO属性剖面上表现为强振幅。并预测出上述地区的气水分布关系,指出了该区的天然气富集区带,经多批开发井钻探结果证实,该方法对须六段气层及气水层分布的预测符合率在80%以上,为指导下一步开发井(特别是水平井)的部署提供了依据。
In order to understand the fluid-bearing properties of the reservoirs in Guang'an gas field,the Sichuan Basin,and to guide the emplacement of development wells,we analyzed the petrophysical properties of reservoirs penetrated and performed forward modeling.On the basis of this,we summarized the typical gas-bearing properties of reservoirs in Xu-6(the sixth member of the Upper Triassic Xujiahe Formation)of Guang'an gas field through the comparison of amplitude changes on the near-trace and the far-trace stacking profiles of real seismic data,the analysis of pre-stack gathers,and in combination with AVO attribute inversion profiles.The following results were obtained:①both density and poison ratio are low;②the amplitude gets higher along with the increasing offset on AVO attribute profiles;③the amplitude on the far-trace stacking profile is significantly higher than that on the near-trace stacking profile;④the amplitude is high on the AVO attribute profile.We also predicted the gas-water contact and delineated potential gas plays in the study area.The drilling results of many development wells reveal that the coincidence rate of the predictions of the gas layers and gas-water layers in Xu-6 with this method is over 80%.This study provides a basis for future emplacement of development wells,especially horizontal wells.
In order to understand the fluid-bearing properties of the reservoirs in Guang'an gas field,the Sichuan Basin,and to guide the emplacement of development wells,we analyzed the petrophysical properties of reservoirs penetrated and performed forward modeling.On the basis of this,we summarized the typical gas-bearing properties of reservoirs in Xu-6(the sixth member of the Upper Triassic Xujiahe Formation)of Guang'an gas field through the comparison of amplitude changes on the near-trace and the far-trace stacking profiles of real seismic data,the analysis of pre-stack gathers,and in combination with AVO attribute inversion profiles.The following results were obtained:①both density and poison ratio are low;②the amplitude gets higher along with the increasing offset on AVO attribute profiles;③the amplitude on the far-trace stacking profile is significantly higher than that on the near-trace stacking profile;④the amplitude is high on the AVO attribute profile.We also predicted the gas-water contact and delineated potential gas plays in the study area.The drilling results of many development wells reveal that the coincidence rate of the predictions of the gas layers and gas-water layers in Xu-6 with this method is over 80%.This study provides a basis for future emplacement of development wells,especially horizontal wells.
引文
[1]宋维琪,徐文会.含气储层预测方法及应用[J].天然气工业,2008,28(2):61-63.
[2]王权锋,周仲礼,张艳芳.天然气储层综合预测技术在锦州27区的应用[J].天然气工业,2008,28(8):46-48.
[3]殷八斤,曾灏,杨在若.AVO技术的理论与实践[M].北京:石油工业出版社,1995.
[4]赵伟,陈小宏,李景叶.薄互层调谐效应对AVO的影响[J].石油物探,2006,45(6):570-573.
[2]王权锋,周仲礼,张艳芳.天然气储层综合预测技术在锦州27区的应用[J].天然气工业,2008,28(8):46-48.
[3]殷八斤,曾灏,杨在若.AVO技术的理论与实践[M].北京:石油工业出版社,1995.
[4]赵伟,陈小宏,李景叶.薄互层调谐效应对AVO的影响[J].石油物探,2006,45(6):570-573.
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