【摘要】 AVO技术以弹性理论为基础,对地震反射振幅随炮检距的变化特征进行研究,以达到利用地震反射振幅信息检测油气的目的。分析了AVO反演的技术流程,对无实测横波资料的井采用优化Xu-White模型进行横波预测,并对叠前地震资料利用蓝色滤波技术进行拓频处理。叠前AVO反演方法选择同步反演法,同时反演得到纵波阻抗、横波阻抗及密度数据体,在此基础上提取出各种弹性参数,结合区域地质和测井解释气层标准,达到岩性及气层预测的目的。通过将该技术在中国东部某区块的应用,证明所预测的气层厚度与测井解释结果的相对误差小于4%,预测精度较高。更多还原

【Abstract】 Based on the theory of elasticity and the information of the amplitude variation with offset in the seismic reflection, AVOs (Amplitude Versus Offset) can be used to detect the gas and oil reservoirs. This paper analyzes the process of AVO’s inversion techniques, where the optimized Xu-White model is used to predict the S -wave without observed S -wave data, the technique of blue filtering is used in the process of expanding frequency range before the inversion, and the method of synchronous inversion is used in the pre-stack inversion, at the same time in obtaining the inversion about P -wave’s impedance, S -wave’s impedance and the density, and as the results, extracting various elastic parameters, for forecasting the lithology and fluid content in reservoir pores, combined with the regional geology and log standard. The application of this technique in some zone in east China proves that the relative error of the thickness of the gas formation is less than 4 percent as compared with the logging interpretation result. The accuracy of predicting is dependable更多还原