| 地震密度反演及地层孔隙度估计 |
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| 引用本文： | 石玉梅,姚逢昌,孙虎生,齐莉.地震密度反演及地层孔隙度估计[J].地球物理学报,2010,53(1):197-204. |
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| 作者姓名： | 石玉梅 姚逢昌 孙虎生 齐莉 |
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| 作者单位： | 中国石油勘探开发研究院，北京 100083 |
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| 基金项目： | 国家基础研究发展规划项目(973项目)，中国石油天然气集团公司基础研究项目 |
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| 摘 要： | 地层密度直接与孔隙度、孔隙流体类型、饱和度和骨架矿物成分有关.本文通过理论分析和计算，讨论了油气藏储层物性参数变化引起的密度变化及密度变化对地震波速度、阻抗和振幅的影响，提出了基于完全纵波方程的全波形地震密度反演和孔隙度估计方法，克服了常规地震密度反演对地震数据更多处理引起的信号畸变，提高了地震密度反演和地层孔隙度估计的精度.该方法采用波场导数的时间积分和多炮求和，对地震数据中的噪声具有比较强的压制作用.理论模型研究表明该方法是可行的.通过对我国西部某气田实际数据处理、分析和反演，获得了地层密度和孔隙度，结果与测井基本吻合，证明了预测结果的准确性和方法的有效性，从而为后续的有效储层预测和储量计算提供了可靠的数据.
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| 关 键 词： | 地震 全波形反演 介质密度 孔隙度 |
| 收稿时间： | 2008-11-19 |
| 修稿时间： | 2009-11-28 |
Density inversion and porosity estimation using seismic data |
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| SHI Yu-Mei,YAO Feng-Chang,SUN Hu-Sheng,QI Li.Density inversion and porosity estimation using seismic data[J].Chinese Journal of Geophysics,2010,53(1):197-204. |
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| Authors: | SHI Yu-Mei YAO Feng-Chang SUN Hu-Sheng QI Li |
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| Institution: | Research Institute of Exploration and Development, PetroChina, Beijing 100083, China |
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| Abstract: | Formation mass density is directly related to porosity, fluid type, fluid saturation, ancl matrix mineral composition. The change of the reservoir parameters can cause the change of density and then the seismic velocity, impedance and amplitude. We discussed the characteristics of the changes by theoretical calculation and presented a method for estimating density and porosity based on full acoustic waveform inversion. Because of avoiding the signal distortion caused by more processing, the method can improve the inversion accuracy of density and porosity. It also can eliminate noise by integrating the derivative of wave field along time and summing multi-shot data. The method has been tested successfully by a synthetic example and gas-field data from western China. The density and porosity provided by the method agree with the logging result. It also supplies reliable data for prediction of effective reservoir and calculation of reserves. |
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| Keywords: | Seismic Full waveform inversion Density Porosity |
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