海拉尔盆地贝西地区南屯组砂岩储层地震识别技术研究

发布时间：2018-03-23 23:27

本文选题：贝西地区　切入点：南屯组储层　出处：《东北石油大学》2017年硕士论文

【摘要】：贝西研究区主要包括霍多莫尔构造带、苏德尔特构造带、贝西次凹和贝西斜坡带。贝西地区南屯组地层岩性主要为粉砂岩和砂砾岩,储层物性较差,孔隙度、渗透率较低,在波阻抗上非储层与储层的差别不大,利用常规地震反演方法进行储层识别预测较困难;由于断陷盆地沉积相变化较快,虽然砂岩储层在垂向上较为发育,但砂岩单层厚度相对较薄,由于地震纵向分辨率的制约,单砂体预测识别难度较大,同时埋深、压实等因素导致选择敏感弹性物理参数非常困难。本文针对贝西地区南屯组砂岩储层的地震预测难点,在测井资料岩石物理弹性参数分析的基础上,通过叠后去压实效应和叠后储层波阻抗反演结合提高本区储层岩性垂向分辨能力,为了最好获得地震有效频带信息,在此处理基础上通过地震拓宽频率提高分辨率处理,地震资料和岩性的纵向分辨能力得到显著提高,最后借助蒙特卡罗算法将随机模拟技术和约束稀疏脉冲反演相结合,进行随机反演,很好地解决了砂泥岩岩性叠置带来预测的多解性难题,南屯组5-8米储层得到有效识别,形成了一套适合该研究区的砂岩储层预测的技术方法和流程。通过分析南屯组各砂层组的砂地比及砂岩厚度图,总结了南屯组一段、二段各个砂层组砂岩平面分布规律;并对霍12井和霍9井主力含油砂体进行了追踪解释,为下一步勘探部署提供了具体目标;最后,在成藏条件以及成藏主控因素分析基础上,进行了有利储层综合评价。
[Abstract]:The Besi study area mainly includes the Hodomore structural belt, the Sirte structural belt, the Besi subdepression and the Besi slope belt. The stratigraphic lithology of the Nantun formation in the Besi area is mainly siltstone and sandy gravel, and the reservoir physical property is poor, the porosity and permeability are low. There is little difference between non-reservoir and reservoir in wave impedance, so it is difficult to identify and predict reservoir by using conventional seismic inversion method, because sedimentary facies change rapidly in faulted basin, although sandstone reservoir is more developed in vertical direction. However, the single layer of sandstone is relatively thin, because of the restriction of seismic longitudinal resolution, it is difficult to predict and recognize single sand body, and at the same time it is buried deep. It is very difficult to select sensitive elastic physical parameters due to compaction and other factors. Aiming at the difficulty of seismic prediction of sandstone reservoir of Nantun formation in Bexi area, based on the analysis of rock physical elastic parameters of logging data, The vertical resolution of reservoir lithology in this area is improved by the combination of post-stack decompaction effect and wave impedance inversion of post-stack reservoir. In order to obtain seismic effective frequency band information, the resolution processing is improved by seismic broadening frequency based on this processing. The longitudinal resolution of seismic data and lithology has been improved significantly. Finally, random inversion is carried out by combining stochastic simulation with constrained sparse pulse inversion with Monte Carlo algorithm. The multi-solution problem caused by the superposition of sand and mudstone lithology has been solved well, and the 5-8 meter reservoir of Nantun formation has been effectively identified. A set of technical methods and flow chart of sandstone reservoir prediction suitable for the study area have been formed. By analyzing the sand land ratio and sandstone thickness map of each sand formation of Nantun formation, the sandstone plane distribution law of each sand formation of the first and second member of Nantun formation has been summarized. The main oil-bearing sand bodies in well Huo 12 and well Huo 9 are traced and interpreted, which provides a specific target for the next exploration and deployment. Finally, based on the analysis of reservoir forming conditions and main controlling factors of reservoir formation, a comprehensive evaluation of favorable reservoirs is carried out.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P631.4

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