基于岩石物理参数正演的储层预测方法研究

发布时间：2018-04-25 12:30

本文选题：岩石物理参数正演 + 叠后反演　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：随着勘探技术的逐步发展,勘探的方向也随之发生了转变,勘探的目标由传统寻找构造油气藏逐步转向寻找岩性油气藏。而对岩性油气藏的预测又十分注重地下弹性参数的质量。本论文针对区块地质构造复杂,地震资料分辨率低的岩性地层油气藏K地区开展研究,制定一套适用于该地区的研究方案。针对不同地质条件及资料品质的区块,采用不同的储层预测方法。K研究区构造变形较弱,构造圈闭类型与数量较少,且幅度较低,同时储层反射弱、地震分辨率低、超覆点难以识别,若使用叠前反演则地震资料的质量没有达到要求。因此本论文基于叠后反演展开储层预测方法研究。根据研究区块的特点,综合采用岩石物理参数正演、地震叠后反演技术以及地震属性分析技术。岩石物理分析将测井同储层反演关联起来,测井中的测井特征及其所反映的地球物理规律皆可通过岩石物理的系统分析展示出来。一方面,通过岩石物理参数正演技术可以对缺损信息的井资料进行校正,通过计算,重构出完善的纵、横波速度以及密度等信息,更大程度的提高工区井资料的有效利用,同时为后续的储层预测提供充足的研究数据。另一方面,利用流体替换技术,可以研究不同流体介质环境中的地球物理响应特征。与此同时,通过岩石物理的敏感参数分析,对比分析出识别砂泥岩效果好的参数,从而对后续储层反演工作指明方向。本文通过基于岩石物理分析的叠后反演方法刻画研究区有利储层的空间展布形态及分布特征,落实研究区薄储层的平面分布特征。结合多种地震属性的分析与提取用以约束储层预测结果的不确定性,形成一套适用于埋藏深度大、储层厚度薄、上部存在屏蔽层地区的有利储层预测技术手段和方法。
[Abstract]:With the gradual development of exploration technology, the direction of exploration has also changed, and the target of exploration has gradually shifted from traditional structural oil and gas reservoirs to lithologic reservoirs. The prediction of lithologic reservoir pays much attention to the quality of underground elastic parameters. In this paper, the lithostratigraphic reservoir K area with complex geological structure and low resolution of seismic data is studied, and a set of research scheme suitable for this area is worked out. For the blocks with different geological conditions and data quality, the structural deformation is weaker, the type and number of structural traps are less, the amplitude is lower, the reservoir reflection is weak, and the seismic resolution is low in the study area using different reservoir prediction methods. Overlying points are difficult to identify, and if prestack inversion is used, the quality of seismic data does not meet the requirements. Therefore, this paper develops reservoir prediction methods based on poststack inversion. According to the characteristics of the studied block, the forward modeling of rock physical parameters, post-stack inversion and seismic attribute analysis are adopted. The petrophysical analysis correlates logging with reservoir inversion. The logging characteristics and the geophysical laws reflected in logging can be demonstrated by systematic analysis of rock physics. On the one hand, through the technique of forward modeling of rock physical parameters, the well data of defective information can be corrected, and the perfect information of longitudinal, shear wave velocity and density can be reconstructed by calculation, so as to improve the effective utilization of well data in the working area to a greater extent. At the same time, sufficient research data are provided for the subsequent reservoir prediction. On the other hand, geophysical response characteristics in different fluid environments can be studied by using fluid replacement technique. At the same time, through the analysis of the sensitive parameters of rock physics, the parameters with good effect of identifying sand and mudstone are compared and analyzed, thus pointing out the direction of the subsequent reservoir inversion work. In this paper, the spatial distribution and distribution characteristics of favorable reservoirs in the study area are described by post-stack inversion method based on petrophysical analysis, and the plane distribution characteristics of thin reservoirs in the study area are realized. Combined with the analysis and extraction of various seismic attributes to constrain the uncertainty of reservoir prediction results, a set of favorable reservoir prediction techniques and methods suitable for large buried depth, thin reservoir thickness and the existence of shielding layer in the upper part of the reservoir are formed.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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