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2. �й�ʯ��ʯ�Ϳ�̽�����о�Ժ, ���� 100083;
3. �й�ʯ��ҳ��������̽�����ص�ʵ����, ���� 100083;
4. ҳ������������������Ч���������ص�ʵ����, ���� 100083
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�ؼ����� �ϸ���   ��������   AVAz   �����ʷ�   ����ϵ��  
Modeling and analysis of anisotropic overburden effects on seismic AVAz from fractured reservoir
LU Neng1, LIU Cai1, GUO Zhi-qi1, LIU Xi-wu2,3,4
1. Geo-exploration Science and Technology Institute, Jilin University, Changchun 130026, China;
2. SinoPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China;
3. SinoPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China;
4. State Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development, Beijing 100083, China
Abstract:

In order to understand the AVAz responses from reservoirs with parallel vertical fractures,which underlying VTI strata, we propose a revevant forward modelling method. The method was in analogy with the formula of horizontal slowness components in Schoenberg's method, using the slowness components in terms of incident angle, azimuth and phase velocity in VTI medium as input, and simplified the scheme of anisotropic reflectivity method. We model seismic AVAz responses from the reservoir by this method, and analyze the variation of seismic responses with incident angle and the degree of anisotropy in the overburden. The results show that it is more accurate to undertake AVAz analysis in a reasonable big incident, and the overlying VTI strata weakens the reservoir's seismic AVAz responses. Numerical simulation in log scale proves the practicability of this method.

Keywords: overburden   anisotropic   AVAz   reflectivity method   reflection coefficient  
�ո����� 2016-03-31 �޻����� 2016-06-29 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2017.01.028
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