海上高密度三维地震采集处理优化技术及应用——以平湖油气田为例
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摘要
平湖油气田原有地震资料为分块采集所得,信噪比与分辨率无法满足储层预测与油气检测的需要。针对该油田勘探开发的难点,通过优化地震采集处理参数,实施了基于品质参数对比的海上高密度三维地震采集技术,获得了高质量的地震资料,其信号能量与噪音能量之间的差异比原有资料提高了7.1 dB,同时有效频带宽度增加了32.2 Hz,目标层段垂向和横向分辨率也优于原始资料。基于该资料完成的平湖油气田宝石组储层预测及含油气性检测结果与实钻资料吻合较好,依据研究结果部署的多口探井获得成功,取得了重大的突破。
The original seismic data of Pinghu oil and gas field is acquired successively and separately,whose SNR and resolution can not meet the requirements of present exploration demand.Focusing on the difficulties in the exploration and development,by optimizing the seismic acquisition and processing parameters,a seismic survey based on Q-Marine technology is carried out successfully and a high-quality seismic dataset is achieved.Compared with the previous data,the power difference between signals and noises of this new seismic data has been improved by 7.1 dB,and the effective frequency bandwidth has been extended by 32.2 Hz.Thanks to the improvement of frequency quality,the vertical and horizontal resolutions in the target zone have been improved by 8 meters and 15 meters.The predictions based on this data have been proved by the wells drilled recently,and a breakthrough of exploration has been realized in this area.
The original seismic data of Pinghu oil and gas field is acquired successively and separately,whose SNR and resolution can not meet the requirements of present exploration demand.Focusing on the difficulties in the exploration and development,by optimizing the seismic acquisition and processing parameters,a seismic survey based on Q-Marine technology is carried out successfully and a high-quality seismic dataset is achieved.Compared with the previous data,the power difference between signals and noises of this new seismic data has been improved by 7.1 dB,and the effective frequency bandwidth has been extended by 32.2 Hz.Thanks to the improvement of frequency quality,the vertical and horizontal resolutions in the target zone have been improved by 8 meters and 15 meters.The predictions based on this data have been proved by the wells drilled recently,and a breakthrough of exploration has been realized in this area.
引文
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[2]Garden M,Flack B,高伟义,等.Imaging gas reservoirs of Pinghu field,East China Sea[J].Offshore,2008,68(7):56-58.
[3]叶加仁,顾惠荣,贾健谊.东海西湖凹陷油气地质条件及其勘探潜力[J].海洋地质与第四纪地质,2008,28(4):115-120.
[4]胡望水.东海盆地西湖凹陷平湖斜坡区坡折带发育及特征研究[J].石油地质与工程,2010,24(3):11-14.
[5]赵艳秋.东海西湖凹陷油气成藏地质认识[J].海洋地质动态, 2003,19(5):24-28.
[6]田海芹.西湖凹陷含油气系统研究[J].石油大学学报:自然科学版,2000,24(1):51-56.
[7]赵丽娜.东海西湖凹陷平湖构造带平湖组沉积特征[J].世界地质,2008,27(1):44-49.
[8]许风光,梁连喜,陈明,等.东海平湖油气田流体识别方法与应用研究[J].海洋石油,2009,29(1):96-101.
[9]袁志云,孔令洪,王成林.东海平湖油气田花港组储层地震预测研究[J].国外测井技术,2009,29(1):16-19.
[10]刘书会,徐仁,张昊.基于贝叶斯估计的叠前反演技术在平湖油气田的应用[J].油气地质与采收率,2010,17(4):29-32.
[11]李忠荣.马先林,周坤瑞,等.虚拟井测井曲线的预测技术[J].石油大学学报:自然科学版,1994,18(4):20-25.
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