利用AVO技术检测大庆长垣黑帝庙油层浅层气藏

大庆长垣浅层气藏具有埋藏浅、成因复杂、储量小、丰度低、类型多和分布广的特点,地震预测技术一直没有获得突破。应用叠前AVO属性识别浅层气分布范围,首先分析叠前CRP道集地震振幅随偏移距的变化特征,查明含气储层的AVO异常类型,然后优选适合的P(纵波反射系数)、G(斜率)属性组合,快速预测浅层气藏。此方法不受井的约束,预测结果可靠。目前AVO技术在松辽盆地浅层气藏识别中已得到推广应用。

Detection of shallow gas reservoir in Heidimiao oil layer of Daqing Pluto by AVO technology

The shallow gas reservoirs in Daqing Pluto have the characteristics of shallow burial,complex causes,low reserves,low abundance,many types and wide distribution,and the earthquake prediction technology has not been broken.Research shows that the pre-stack AVO attribute can efficiently identify the distribution of shallow gas.First,the variation characteristics of the amplitude of the prestack of the pre-cascade CRP are analyzed,and the AVO anomaly type of the gas-bearing reservoir is found,and then the appropriate P (longitudinal wave reflection coefficient) and G (slope) attribute combination is used to predict rapidly the shallow gas reservoirs.This method is not well restrained by wells,and the prediction results are reliable.At present,AVO technology has been popularized in the identification of shallow gas reservoirs in Songliao Basin.