时频分析技术在须家河组储层气水判别中的应用
摘要
四川盆地川西坳陷深层上三叠统须家河组的X851井、X856井、X2井、X3井、X10井等一批高产气井证实了该区具有巨大的勘探开发潜力。然而,CX565、X201等高产水井的出现也为该区成功部署井位增添了不确定因素,因此,对该区须家河组储层气水判别就显得尤为重要。地震波在须家河组的含气储层和含水储层中传播时,在时间域内难以发现振幅、频率和能量等动力学属性的变化差异。采用时频分析技术将时间域的地震信号变换到时间—频率域进行对比分析解释,发现"低频阴影"、"高频衰减"等现象在含气储层中十分突出,而在含水储层中却不存在。利用时频域内的这些典型特征建立模式,并对该区含气储层和含水储层进行了有效的区分,其结果与钻、测井资料吻合良好。
The existence of many high-yielding wells,including X851,X856,X2,X3 and X10,prove the large potential of the Upper Triassic Xujiahe Formation reservoirs in the western Sichuan depression.However,the drilling of several wells with high water production such as CX565 and X201 increase the uncertainty and risk of well emplacement in the study area.Therefore,it is very important to discriminate the gas and water layers in the Xujiahe Formation reservoirs,but difficult to identify anomalies of amplitude,frequency and energy in time domain during propagation of waves in the gas and water layers.After seismic signals in time domain are transformed into signals in time-frequency domain by use of the time-frequency analysis method,"low frequency shadow" and "high-frequency attenuation" become significant in gas layers,while they do not occur in water layers.These unique features of time-frequency domain are used to build up a model for the discrimination of gas and water layers.The results are consistent with the drilling and logging data.
The existence of many high-yielding wells,including X851,X856,X2,X3 and X10,prove the large potential of the Upper Triassic Xujiahe Formation reservoirs in the western Sichuan depression.However,the drilling of several wells with high water production such as CX565 and X201 increase the uncertainty and risk of well emplacement in the study area.Therefore,it is very important to discriminate the gas and water layers in the Xujiahe Formation reservoirs,but difficult to identify anomalies of amplitude,frequency and energy in time domain during propagation of waves in the gas and water layers.After seismic signals in time domain are transformed into signals in time-frequency domain by use of the time-frequency analysis method,"low frequency shadow" and "high-frequency attenuation" become significant in gas layers,while they do not occur in water layers.These unique features of time-frequency domain are used to build up a model for the discrimination of gas and water layers.The results are consistent with the drilling and logging data.
引文
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[3]徐炳高.川东北地区碳酸盐岩储层分类与油气识别方法研究[J].测井技术,2004,28(5):410-413.
[4]李瑞,向运川,杨光惠,等.孔隙结构指数在鄂尔多斯中部气田气水识别中的应用[J].成都理工大学学报:自然科学版,2004,31(6):689-693.
[5]伍志明,李亚林,巫芙蓉,等.多分量资料在碳酸盐岩裂缝性气藏气水识别中的应用研究[J].天然气工业,2004,24(1):75-77.
[6]彭真明,李亚林,梁波,等.叠前弹性阻抗在储层气水识别中的应用[J].天然气工业,2007,27(4):43-45.
[7]徐天吉,程冰洁.瞬时谱分析技术与气水识别方法研究[J].石油天然气学报,2008,30(4):73-78.
[8]高静怀,汪文秉,朱光明,等.地震资料处理中小波函数选取研究[J].地球物理学报,1996,39(3):392-400.
[9]李世雄,汪继文.信号的瞬时参数与正交基[J].地球物理学报,2000,43(1):97-104.
[10]高静怀,汪文秉,朱光明,等.地震资料处理中小波函数选取研究[J].地球物理学报,1996,39(3):392-400.
[11]李世雄,汪继文.信号的瞬时参数与正交基[J].地球物理学报,2000,43(1):97-104.
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