地震技术在苏5、桃7区块中的应用
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摘要
苏里格气田苏5、桃7区块储层具有非均质性强、砂体纵横向变化快、有效厚度薄的特点。原开发评价中Ⅰ+Ⅱ类井仅占62%,成效很低。为实现经济、高效的开发目标,对从采集到处理和解释的全过程技术都进行了认真细致的研究,以提高地震预测的分辨率和成果的可靠性。在储层预测中,紧密跟踪钻井动态,滚动研究,反复认识,通过对不同类型储层、不同含气性储层的地震反射特征进行深入研究,建立储层(尤其是含气砂岩)的地震响应模式。运用三维地震属性分析、多井约束叠后地震反演等多种手段研究储层段砂体的纵横向分布规律。在此基础上,通过多子波分解及重构技术进一步研究储层的含气性特征,预测有效储层的分布和油气富集区。特别运用三维地震资料,在苏5区块寻找到了3个油气富集区带。利用上述地震预测技术,目前苏5、桃7区块的钻探成功率大大提高,Ⅰ+Ⅱ类井达到91%。
The reservoir of blocks Su-5 and Tao-7 in Sulige gas field is characterized by strong heterogeneity, fast change of sand body not only in longitudinal direction but horizontal direction and thin effective thickness. In the original development evaluation, wells belonging to kindsⅠ+Ⅱ just account for 62%, so effect is very little. In order to realize economical developing aim with high efficiency, the gamut from collection, processing and interpretation was studied in serious and detailed way to improve the resolution of seismic prediction and the reliability of the achievement. In the reservoir prediction of Su-5 and Tao-7, this study, keeping up with drilling dynamics closely, established seismic response mode of reservoir (especially gas bearing sandstone) on seismic reflectance signatures of different reservoir and different gas bearing reservoir. It also studied the longitude and horizontal distribution law of sand body of reservoir by means of 3D-seismic attribute analysis and multiwell restriction post-stack seismic inversion. On the base of the mentioned above, the characteristics of gas-bearing reservoir were studied further and the attribution of efficient pay and area rich in oil and gas was predicted through multiwavelet decomposition and reconfiguration technology. Three sectors rich in oil and gas in block Su-5 were found by the use of 3D seismic information. The successful drilling rate in Su-5 and Tao-7 has been increased sharply and wells belonging to kinds Ⅰ+Ⅱ account for 91% by making use of seismic prediction technology mentioned above.
The reservoir of blocks Su-5 and Tao-7 in Sulige gas field is characterized by strong heterogeneity, fast change of sand body not only in longitudinal direction but horizontal direction and thin effective thickness. In the original development evaluation, wells belonging to kindsⅠ+Ⅱ just account for 62%, so effect is very little. In order to realize economical developing aim with high efficiency, the gamut from collection, processing and interpretation was studied in serious and detailed way to improve the resolution of seismic prediction and the reliability of the achievement. In the reservoir prediction of Su-5 and Tao-7, this study, keeping up with drilling dynamics closely, established seismic response mode of reservoir (especially gas bearing sandstone) on seismic reflectance signatures of different reservoir and different gas bearing reservoir. It also studied the longitude and horizontal distribution law of sand body of reservoir by means of 3D-seismic attribute analysis and multiwell restriction post-stack seismic inversion. On the base of the mentioned above, the characteristics of gas-bearing reservoir were studied further and the attribution of efficient pay and area rich in oil and gas was predicted through multiwavelet decomposition and reconfiguration technology. Three sectors rich in oil and gas in block Su-5 were found by the use of 3D seismic information. The successful drilling rate in Su-5 and Tao-7 has been increased sharply and wells belonging to kinds Ⅰ+Ⅱ account for 91% by making use of seismic prediction technology mentioned above.
引文
[1]邹才能.油气勘探开发实用地震新技术[M].北京:石油工业出版社,2002.
[2]李庆忠.走向精确勘探的道路———高分辨率地震勘探系统工程剖析[M].北京:石油工业出版社,1993.
[3]俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993.
[4]凌云研究组.基于地震属性在沉积环境解释中的应用研究[J].石油地球物理勘探,2003,38(6):642-653.
[5]郑晓东.AVO分析技术及应用中注意的问题.地震勘探方法理论与实践[M].北京:石油工业出版社,2004.
[6]夏竹,刘超颖,魏文博,等.地震道时间域频率属性特征和地层层序的划分[J].石油地球物理勘探,2005,40(5):550-560.
[2]李庆忠.走向精确勘探的道路———高分辨率地震勘探系统工程剖析[M].北京:石油工业出版社,1993.
[3]俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993.
[4]凌云研究组.基于地震属性在沉积环境解释中的应用研究[J].石油地球物理勘探,2003,38(6):642-653.
[5]郑晓东.AVO分析技术及应用中注意的问题.地震勘探方法理论与实践[M].北京:石油工业出版社,2004.
[6]夏竹,刘超颖,魏文博,等.地震道时间域频率属性特征和地层层序的划分[J].石油地球物理勘探,2005,40(5):550-560.
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