四川盆地碳酸盐岩储层的气、水判别
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摘要
四川盆地碳酸盐岩储层的地震、地质特征表现为1含气层段的泊松比数值明显低于非储层段,含气层段的泊松比数值也明显低于含水储层段;2含气储层对应的反射振幅随入射角增大而增大,含水储层对应的反射振幅随入射角的增大变化不明显;3碳酸盐岩储层的反射波振幅绝对值随入射角的增大而增大,不存在极性反转现象。基于碳酸盐岩储层的上述地震、地质特征,文中指出在AVO预处理时应采用叠前时间偏移法将共中心点道集变换为共反射点道集;在AVO属性分析时,除进行常规AVO属性分析、弹性波波阻抗反演之外,还要进行连续频谱分析研究。应用文中的AVO技术系列对多套碳酸盐岩储层进行了气、水判别,并获得了数十口探井的钻探试油结果验证。
The seismic and geologic characters of carbonate reservoir in Sichuan basin are: ①the Poison ratio of gas bearing strata is greatly lower than that of non reservoir and the Poison ratio of gas bearing strata is greatly lower than that of water bearing strata;②the reflected amplitude associated with gas bearing reservoir increased with incident angle and the reflected amplitude associated with water bearing reservoir has no significant variance with incident angle;③ the absolute value of reflected amplitude associated with gas bearing reservoir increased with incident angle and the polarity has no reverse.On the basis of above mentioned seismic and geologic characters of carbonate reservoir,the paper pointed out that we should use prestack time migration to transform the common midpoint gathers to common reflection point gathers in AVO preprocessing;we should study continuous spectrum analysis besides ordinary AVO attributes analysis and inversion of elastic impedance in AVO attributes analyses.Application of AVO technical series in the paper to distinguish the gas from water in many sets of carbonate reservoirs,that was examined by the results of testing of well in tens exploration wells.
The seismic and geologic characters of carbonate reservoir in Sichuan basin are: ①the Poison ratio of gas bearing strata is greatly lower than that of non reservoir and the Poison ratio of gas bearing strata is greatly lower than that of water bearing strata;②the reflected amplitude associated with gas bearing reservoir increased with incident angle and the reflected amplitude associated with water bearing reservoir has no significant variance with incident angle;③ the absolute value of reflected amplitude associated with gas bearing reservoir increased with incident angle and the polarity has no reverse.On the basis of above mentioned seismic and geologic characters of carbonate reservoir,the paper pointed out that we should use prestack time migration to transform the common midpoint gathers to common reflection point gathers in AVO preprocessing;we should study continuous spectrum analysis besides ordinary AVO attributes analysis and inversion of elastic impedance in AVO attributes analyses.Application of AVO technical series in the paper to distinguish the gas from water in many sets of carbonate reservoirs,that was examined by the results of testing of well in tens exploration wells.
引文
[1]蔡泽蒙.川东上二叠统生物礁的地震响应研究.SPG/SEG1990联合文件,1990
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[2]蔡启宏,蔡泽蒙,张蓉.频谱分析在薄层气藏描述中的应用.石油物探信息,1997
[3]王罗兴,谢芳.川东北部飞仙关组鲕滩气藏地震响应特征及勘探展望.天然气工业,2000,(5)
[4]王一刚,刘划一等.川东北部飞仙关组鲕滩储层分布规律、勘探方法与远景预测.天然气工业,2002,(增刊)
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