AVO流体反演技术在惠州某区的应用
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摘要
惠州某区A22储层由于相带变化导致物性变化较大,致使常规的AVO属性(pXg)对储层进行流体性质预测困难,为解决这一难题,引入了AVO流体反演技术(AFI)。AFI的原理是:首先利用测井曲线建立Monte-Carlo随机正演模型,然后通过Biot-Gassman流体替换理论获得模型中流体分别为油、气、水时的合成记录,利用Shuey公式得到相应的截距和梯度,将实际地震数据所得到的截距和梯度与模型所产生的截距和梯度进行对比,再利用Bayes理论即可定量求得所含油、气、水的可能性。结果表明:预测井位处含油气性得到了钻井证实;受储层物性影响,含气区预测效果好;含油区预测还需其它地球物理手段配合;
As the lithofacies changes of A22 reservoir in an area of Huizhou result in a greater change of its physical properties,it is difficult to use the conventional pXg attribute to predict the fluid property of the corresponding geologic body.In order to solve this problem,the AVO fluid inversion technology(AFI) is introduced,and its procedures are: Firstly,establish a Monte-Carlo forward model by logging curves.Secondly,obtain the synthetic data through Biot-Gassman theory when the fluids are oil,gas and water respectively in the model,get the corresponding intercept and gradient by Shuey's function,and compare these data with the actual seismic data.Finally,determine the probability of each fluid from Bayes theory.According to the results,the oil-gas probability of the predicted drilling is confirmed,and the prediction effect of gas is proved good because of the influence of the reservoir property.However,the prediction of oil areas still needs combination with other geophysical methods.
As the lithofacies changes of A22 reservoir in an area of Huizhou result in a greater change of its physical properties,it is difficult to use the conventional pXg attribute to predict the fluid property of the corresponding geologic body.In order to solve this problem,the AVO fluid inversion technology(AFI) is introduced,and its procedures are: Firstly,establish a Monte-Carlo forward model by logging curves.Secondly,obtain the synthetic data through Biot-Gassman theory when the fluids are oil,gas and water respectively in the model,get the corresponding intercept and gradient by Shuey's function,and compare these data with the actual seismic data.Finally,determine the probability of each fluid from Bayes theory.According to the results,the oil-gas probability of the predicted drilling is confirmed,and the prediction effect of gas is proved good because of the influence of the reservoir property.However,the prediction of oil areas still needs combination with other geophysical methods.
引文
[1]殷八斤,曾灏,杨在岩.AVO技术的理论与实践[M].北京:石油工业出版社,1995.
[2]Rutherford S R.Williams R H.Amplitude-versus-offset variations in gas sands[J].Geophysics,1989,54(6):680~688.
[3]Dan Hampson.AVO inversion t heory and practice[J].The Leading Edge,1991,10(6):39~42.
[4]Brian H Russell,Ken Hedlin,Fred J Hilterman.Fluid-property discrimination wit h AVO:A Biot-Gassmanperspective[J].Geophysics,2003,68(1):29~39.
[5]高建荣.AVO流体反演理论与实践[J].石油勘探与开发,2006,33(5):558~561.
[6]Shuey R T.A simplification of the Zoeppritz equa-tions[J].Geophysics,1985,50:609~614.
[7]郑晓东.Zoeppritz方程的近似及其应用[J].石油地球物理勘探,1991,26(2):129~144.
[2]Rutherford S R.Williams R H.Amplitude-versus-offset variations in gas sands[J].Geophysics,1989,54(6):680~688.
[3]Dan Hampson.AVO inversion t heory and practice[J].The Leading Edge,1991,10(6):39~42.
[4]Brian H Russell,Ken Hedlin,Fred J Hilterman.Fluid-property discrimination wit h AVO:A Biot-Gassmanperspective[J].Geophysics,2003,68(1):29~39.
[5]高建荣.AVO流体反演理论与实践[J].石油勘探与开发,2006,33(5):558~561.
[6]Shuey R T.A simplification of the Zoeppritz equa-tions[J].Geophysics,1985,50:609~614.
[7]郑晓东.Zoeppritz方程的近似及其应用[J].石油地球物理勘探,1991,26(2):129~144.
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