| 基于改进反射系数近似方程的纵横波阻抗同步反演 |
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| 引用本文： | 付欣,张峰,李向阳,钱忠平,陈海峰,梅璐璐.基于改进反射系数近似方程的纵横波阻抗同步反演[J].地球物理学报,2019,62(1):276-288. |
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| 作者姓名： | 付欣 张峰 李向阳 钱忠平 陈海峰 梅璐璐 |
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| 作者单位： | 1. 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249;2. 中国石油大学(北京)CNPC物探重点实验室, 北京 102249;3. 中国石油天然气集团公司东方地球物理勘探有限责任公司, 河北涿州 072751 |
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| 基金项目： | 国家重大专项（2017ZX05018005），国家自然科学基金（41474096），中石油新技术新方法项目（2016A-3305），中国石油大学（北京）科研基金（2462018BJC001）联合资助. |
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| 摘 要： | 基于地震波反射系数近似公式的叠前反演是油气勘探的重要工具.本文在已有研究的基础上,推导了一个改进的射线参数域地震纵波反射系数近似方程.该方程建立了地震纵波反射系数与纵波阻抗和横波阻抗的非线性关系,在中、小角度的范围内较现有的反射系数线性近似公式精度更高.另外,由于该方程仅包含纵波和横波阻抗反射系数项,因此基于新方程的反演能够有效地降低同步反演纵波速度、横波速度、密度三个参数的不适定性.在此基础上,结合广义线性反演法(GLI)理论和贝叶斯理论,相应地发展了一种叠前地震同步反演方法.模型测试和实际资料的应用表明,基于新方程的反演方法能够利用有限角度(偏移距)的数据稳定地反演纵波和横波阻抗,由于在反演过程中,不需要假设纵横波速度为常数,因此该方法还能有效地提高反演结果的精度.
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| 关 键 词： | 反射系数 叠前反演 纵波阻抗 横波阻抗 贝叶斯广义线性反演 |
| 收稿时间： | 2017-08-06 |
Simultaneous inversion of P-and S-wave impedances based on an improved approximation equation of reflection coefficients |
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| FU Xin,ZHANG Feng,LI XiangYang,QIAN ZhongPing,CHEN HaiFeng,MEI LuLu.Simultaneous inversion of P-and S-wave impedances based on an improved approximation equation of reflection coefficients[J].Chinese Journal of Geophysics,2019,62(1):276-288. |
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| Authors: | FU Xin ZHANG Feng LI XiangYang QIAN ZhongPing CHEN HaiFeng MEI LuLu |
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| Institution: | 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum, Beijing 102249, China;3. BGP INC., China National Petroleum Corporation, Heibei Zhuozhou 072751, China |
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| Abstract: | Prestack inversion utilizing approximate formulas of reflection coefficients is an important tool for exploration of oil and gas. In this paper, we derivate an improved approximation of reflection coefficients in the ray parameter domain. This equation provides a nonlinear relationship between seismic reflection coefficients and P-and S-wave impedance reflectivity, and is more accurately than the conventional linearized equations in the range of small and middle incident angles. Besides, because the new equation contains only the terms of P-and S-wave impedances, the inversion utilizing this equation can efficiently reduce the ill-posedness of the simultaneous inversion of P-wave velocity, S-wave velocity and density. We then develop a prestack seismic inversion method by combining the generalized linear inversion (GLI) method and the Bayes theory. Both of synthetic and real data tests show the feasibility of this inversion scheme, and for the reason of the assumption that P-and S-wave velocity ratio is constant does not use in the inversion process, the accuracy of inverted results is improved effectively. |
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| Keywords: | Reflectivity Prestack inversion P-wave impedance S-wave impedance Bayes generalized linear inversion |
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