项目名称: 复杂各向异性介质弹性阻抗张量理论研究与应用
项目编号: No.41474096
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 天文学、地球科学
项目作者: 张峰
作者单位: 中国石油大学(北京)
项目金额: 100万元
中文摘要: 虽然正交各向异性是沉积盆地中最为常见的地震各向异性形式之一,但目前这种复杂各向异性系统的弹性阻抗尚无明确的物理定义,并且针对以页岩为代表的复杂各向异性介质的岩石物理表征方法和地震反演方法也是现阶段一个国际性的难题。针对上述问题,本项目将从地震弹性阻抗张量理论、各向异性的成因和表征、应用途径这三个方面展开研究。首先,开展正交各向异性系统弹性阻抗张量的理论研究,在此基础上进行阻抗特征及敏感参数分析;其次,以地震各向异性响应最为显著的页岩作为具体研究对象,开展岩石物理实验和建模方法研究,并以此为基础建立页岩物性特征与各向异性弹性阻抗张量的关系。最后以前面两方面理论研究为基础,探索各向异性地震弹性阻抗的反演方法和针对页岩储层的定量解释方法。通过本项目的研究,为复杂各向异性介质的地震描述提供新的理论依据和技术支持,从而推动页岩气储层地震勘探技术的发展。
中文关键词: 各向异性;弹性阻抗;岩石物理;页岩;反演
英文摘要: Orthorhombic anisotropy is one of the most common forms of anisotropy in sedimentary basin. However, the elastic impedance in this complex anisotropic system is not appropriately defined; besides, the rock physics modeling and seismic inversion for complex anisotropic media, such as shale, are still to be solved. In this project, we would study the theory of anisotropic impedance, the genesis of seismic anisotropy and its modeling, and the application of anisotropic impedance seismic exploration. In this sense, we first define the seismic elastic impedance tensor in the orthorhombic media, and analyze its properties; secondly, we study the shale core sample and log data, in order to establish accurate anisotropic rock physics models for complex anisotropic media; last but not the least, methodologies of anisotropic seismic elastic impedance would be studied, as well as the techniques of quantitatively interpretation of shale gas reservoir. This research provides the basic theory and techniques for the delineation of complex anisotropic media, it also it helps the development of seismic exploration techniques of shale gas reservoir.
英文关键词: anisotropy;elastic impedance;rock physics;shale;inversion