| 模拟退火叠前AVA同步反演方法 |
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| 引用本文： | 杨午阳.模拟退火叠前AVA同步反演方法[J].地球物理学进展,2010,25(1):219-224. |
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| 作者姓名： | 杨午阳 |
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| 作者单位： | 中国石油勘探开发研究院西北分院,兰州,730020 |
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| 基金项目： | 国家重点基础研究发展计划项目 |
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| 摘 要： | 叠前反演技术已经成为岩性预测和流体识别的关键技术，并将在油气勘探中发挥重要作用，本文提出了模拟退火AVA同步反演方法，该方法以多个角道集地震数据体和先验纵波速度、横波速度、密度模型等为输入，综合利用地震、地质、测井等多种信息为约束，采用模拟退火全局优化方法，直接采用Knott-Zoeppritz方程求解反射系数，同步反演获得纵波阻抗、横波阻抗、纵横波速度、密度、Mu、Lambda等23种岩石弹性参数模型.其主要特点如下：１）采用Zoeppritz方程直接求解，精度高；2) 目标函数选择灵活；３）多角度提取子波；４）可获得深度域的反演结果.实际资料应用证明，该反演方法保留了地震反射振幅随偏移距不同或入射角不同而变化的特征，可有效提高储层预测和流体识别精度.实际应用表明，本方法预测结果可靠，具有较强的实用性.
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| 关 键 词： | 模拟退火 叠前同步反演 Zoeppritz方程 角道集 |
| 收稿时间： | 2009-07-12 |
| 修稿时间： | 2009-10-19 |
Pre-stack simultaneous AVA inversion algorithm with simulated annealing |
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| YANG Wu-yang.Pre-stack simultaneous AVA inversion algorithm with simulated annealing[J].Progress in Geophysics,2010,25(1):219-224. |
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| Authors: | YANG Wu-yang |
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| Abstract: | Prestack inversion has been key technique for lithology prediction and fluids identify. At the same time this technique will play an important role in oil and gas exploration. In this paper, a new method will be present in this paper. In this method, multiple angle stack seismic data, priori P wave velocity, S wave velocity and density etc, have been used for import data. At the same time Seismic, geology and well log information have been used for restraint information. At last We use annealing global optimization algorithm and simultaneous inversion P wave impudence, S wave impdence,density, Mu,Lambdaetc., 23 kinds of rock elastic paramters model. The main unique feature as follows: 1) Full Knott-Zoeppritz equations are used to determine reflection coefficients .2) With facility objection function.3) The results in depth domain can be abtained. 4) An individual wavelet is used for each angular offset. The good effects were achieved in real seismic data. This is shown that the methods are feasible, reliable and practicablity. This methods not only reserves the relationship of AVO but also effectively advance the accuracy of reservori prediction and fluids identify. |
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| Keywords: | simulatedannealing pre-stacksimultaneousinversion Zoeppritzequations anglegather |
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