SLG地区气水识别技术研究

发布时间：2018-03-21 09:47

本文选题：气水识别　切入点：叠前弹性参数反演　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：SLG地区是我国内陆的主要气田,是典型的圈闭性气藏。其主力产层盒8段具有“低孔、低渗、低丰度”的特征,且局部气藏规模小。产层盒8段砂体延展能力有限,有效砂体连通性不强,储层极具非均质性,并且无统一的气水界面,气水关系相当复杂。针对SLG地区这种复杂气水关系的情况,本文首先分析了目前常用的多种气水识别方法的方法理论,然后结合研究区的测井及地震、地质等资料,研制一套适用于研究区的气水识别技术系列。论文主要取得以下三项关键研究成果:(1)研制了一套适用于SLG地区的气水识别技术系列,该技术系列从六个方面对常规方法进行了改进:①采用先层拉平后保边去噪的特色去噪手段,以提高资料的信噪比和分辨率并较好的保留边缘信息,为后期反演打好基础;②采用高精度的横波速度预测方法弥补工区仅2口井有横波数据的不足;③采用更适合于非匀质性强地区的扩展弹性阻抗反演方法反演叠前弹性参数信息;④以反演的工区叠前弹性参数为基础优选气水识别因子;⑤叠后反演采用随机反演与测井参数拟合的反演方法;⑥综合利用叠前及叠后参数联合进行气水识别分析,降低了参数多解性的影响,使气水识别更加精准。(2)利用该技术进行SLG地区气水分布规律研究,得出了该研究区的气水分布特征——含气普遍但分散性强、局部气富集区较少、气水同产区域较多等。(3)部署了一口具有较高开发潜力的建议井。该井位于构造较高位置,砂体和储层发育良好,表现为气富集特征,因此具有很高的勘探和开发价值。实际资料的结果表明,本文提出的气水识别技术系列在SLG地区应用效果良好,为该地区的气水识别提供了很好的技术支持,具有重要的理论和实际应用及推广价值。
[Abstract]:The SLG area is the main gas field in the inland of China, which is a typical trap gas reservoir. The main production layer is characterized by "low porosity, low permeability and low abundance", and the local gas reservoir is small in scale. The connectivity of effective sand body is not strong, the reservoir is extremely heterogeneous, and there is no uniform gas-water interface, the gas-water relationship is quite complex. In this paper, we first analyze the methods and theories of gas and water identification in common use, and then combine well logging and seismic, geological and other data in the study area. A series of gas-water identification techniques suitable for the study area has been developed. In this paper, the following three key research achievements have been obtained: (1) A set of gas-water identification technology series suitable for SLG area has been developed. This series of techniques has improved the conventional method from six aspects. In order to improve the signal-to-noise ratio (SNR) and resolution of the data and preserve the edge information, the special de-noising method is adopted in the first layer leveling and then edge preserving. In order to lay a good foundation for the later inversion, the high precision prediction method of shear wave velocity is adopted to make up for the shortage of shear wave data in only 2 wells in the working area. 3. The extended elastic impedance inversion method is used to inverse prestack projectile which is more suitable for the area with strong inhomogeneity. Based on the prestack elastic parameters of the inversion area, the poststack inversion method of random inversion and log parameter fitting is used to analyze the gas and water identification by combining prestack and poststack parameters. It reduces the influence of parameter multi-solvability and makes gas-water identification more accurate. 2) using this technology to study the gas-water distribution law in SLG area, it is concluded that the gas-water distribution characteristic of this research area is that the gas-water distribution is universal but dispersive, and the local gas-rich area is less. A suggested well with high potential for development has been deployed. The well is located in a relatively high structural position, and the sand body and reservoir are well developed, showing the characteristics of gas enrichment. The results of the actual data show that the series of gas-water identification techniques proposed in this paper have a good application effect in the SLG area and provide a good technical support for the gas-water identification in this area. It has important theoretical and practical application and popularization value.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4;P618.13

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