叠前纵横波联合弹性反演

发布时间：2019-02-09 11:38

【摘要】：由于石油需求的与日俱增,构造圈闭勘探程度和深入程度不足,隐性油气藏的勘探变得越来越重要。因此,提高油气的勘探开发能力具有非常重要的意义。叠前纵横波联合弹性反演,从含有丰富地质信息的叠前资料入手,由叠前道集中获取地层纵横波速度、密度等参数,然后利用不同角度的角道集数据得到弹性波阻抗数据体,将为研究储层的变化规律提供新的手段。首先,本文简要介绍地震反演的基本原理及分类,针对递推反演、地质统计学反演、测井约束反演及AVO反演进行优缺点及基本流程的分析,并描述了叠前纵横波联合弹性反演的基本思想及其优势。为后续的应用研究提供了扎实的理论基础。然后,在理论的基础上,对实际工区进行反演,研究工区的目的层段为沙河子组,首先是测井曲线的预处理,主要分为以下几个步骤:测井数据分析、井径垮塌环境校正、直方图法完成测井曲线区域标准化、聚类分析法实现横波曲线重构、储层敏感性参数分析。在进行储层敏感性参数分析的过程中,先对四级层序进行弹性参数及常规测井曲线整体分析,优选出较为敏感的参数,然后再对五级层序进行更精细的分层段交汇分析。通过这一步骤,可以对储层进行更精细的描述。其次是叠前弹性反演技术研究,可以分为:叠前数据部分叠加、精细井震标定、多种弹性属性信息约束、软趋势约束、叠前弹性反演效果分析等几个步骤,叠前弹性反演的重点部分为各种弹性参数体的求取,从而获得岩性解释与单砂体刻画。最后,在确定单砂体的过程中,利用储层的“甜点”属性进行识别,检查弹性纵横波速比的属性,刻画出五级层序单砂体,通过体透视的方法,发现规模较大的单砂体。通过纵横波速比剖面分析,确定建议的水平井井位。
[Abstract]:Due to the increasing demand for oil and insufficient exploration and depth of structural traps, the exploration of hidden reservoirs becomes more and more important. Therefore, it is of great significance to improve the exploration and development ability of oil and gas. Prestack P-S wave combined with elastic inversion, starting with prestack data with abundant geological information, obtains the velocity and density of P-S wave from prestack channel concentration, and then obtains elastic wave impedance data by using angle gather data of different angles. It will provide a new method for studying the change law of reservoir. Firstly, this paper briefly introduces the basic principle and classification of seismic inversion, and analyzes the advantages and disadvantages of recursive inversion, geostatistical inversion, logging constrained inversion and AVO inversion. The basic idea and advantages of prestack P-S wave combined elastic inversion are described. It provides a solid theoretical basis for further applied research. Then, on the basis of theory, the actual working area is inversed. The target section of the work area is Shahezi formation. The first is the pretreatment of logging curve, which is mainly divided into the following steps: log data analysis, well diameter collapse environment correction, Histogram method is used to standardize the area of logging curve, cluster analysis is used to reconstruct shear wave curve, and reservoir sensitivity parameter is analyzed. In the process of reservoir sensitivity parameter analysis, the elastic parameters and conventional logging curves of the four-order sequence are analyzed as a whole, and the more sensitive parameters are selected, and then the five-level sequence is analyzed with more fine stratification intersection analysis. Through this step, the reservoir can be described in more detail. Secondly, the research of prestack elastic inversion technology can be divided into: prestack data partial stack, fine well seismic calibration, multiple elastic attribute information constraints, soft trend constraints, pre-stack elastic inversion effect analysis, etc. The key part of prestack elastic inversion is to obtain various elastic parameter bodies, thus lithologic interpretation and single sand body characterization are obtained. Finally, in the process of determining the single sand body, we use the "dessert" attribute of the reservoir to identify, check the property of elastic longitudinal and transverse wave velocity ratio, and depict the five-grade sequence single sand body. Through the method of body perspective, we find the large single sand body. Through the profile analysis of longitudinal and transverse wave velocity ratio, the suggested horizontal well location is determined.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4

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