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Fluids discrimination by ray-path elastic impedance inversion: A successful case from Sulige tight gas field

机译：通过射线路径弹性阻抗反演判别流体：苏里格致密气田的成功案例

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摘要

Existing seismic prediction methods struggle to effectively discriminate between fluids in tight gas reservoirs, such as those in the Sulige gas field in the Ordos Basin, where porosity and permeability are extremely low and the relationship between gas and water is complicated. In this paper, we have proposed a comprehensive seismic fluid identification method that combines ray-path elastic impedance (REI) inversion with fluid substitution for tight reservoirs. This approach is grounded in geophysical theory, forward modeling, and real data applications. We used geophysics experiments in tight gas reservoirs to determine that Brie's model is better suited to calculate the elastic parameters of mixed fluids than the conventional Wood's model. This yielded a more reasonable and accurate fluid substitution model for tight gas reservoirs. We developed a forward model and carried out inversion of REI, which reduced the non-uniqueness problem that has plagued elastic impedance inversion in the angle domain. Our well logging forward model in the ray-path domain with different fluid saturations based on a fluid substitution model proved that REI identifies fluids more accurately when the ray parameters are large. The distribution of gas saturation can be distinguished from the crossplot of REI (p= 0.10) and porosity. The inverted ray-path elastic impedance profile was further used to predict the porosity and gas saturation profile. Our new method achieved good results in the application of 2D seismic data in the western Sulige gas field.
机译：现有的地震预测方法难以有效地区分致密气藏中的流体，例如鄂尔多斯盆地苏里格气田中的孔隙度和渗透率极低，气水关系复杂的流体。在本文中，我们提出了一种综合的地震流体识别方法，该方法将射线路径弹性阻抗（REI）反演与流体替代技术相结合，用于致密油藏。该方法基于地球物理理论，正演模拟和实际数据应用。我们在致密气藏中进行了地球物理实验，以确定Brie模型比传统的Wood模型更适合计算混合流体的弹性参数。这为致密气藏提供了一个更合理，更准确的流体替代模型。我们开发了一个正向模型并进行了REI的反演，从而减少了困扰角域中弹性阻抗反演的非唯一性问题。基于流体替代模型，我们在具有不同流体饱和度的射线路径域中的测井正演模型证明，当射线参数很大时，REI可以更准确地识别流体。气体饱和度的分布可与REI（p = 0.10）和孔隙度的交会图区分开。倒置的射线路径弹性阻抗曲线进一步用于预测孔隙率和气体饱和度曲线。我们的新方法在二维苏里格气田的地震数据应用中取得了良好的效果。

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  • 来源
    《应用地球物理（英文版）》 |2019年第2期|218-232|共15页
  • 作者

    Wang Da-Xing; Wang Hao-Fan; Ma Jin-Feng; Wang Yong-Gang; Zhang Na; Li Lin;

  • 作者单位

    Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Shaanxi, Xi'an 710018, China;

    National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Field, Shaanxi, Xi'an 710018, China;

    National & Local Joint Engineering Research Center of Carbon Capture and Storage Technology, Department of Geology, Northwest University, Shaanxi, Xi'an 710069, China;

    National & Local Joint Engineering Research Center of Carbon Capture and Storage Technology, Department of Geology, Northwest University, Shaanxi, Xi'an 710069, China;

    Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Shaanxi, Xi'an 710018, China;

    Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Shaanxi, Xi'an 710018, China;

    National & Local Joint Engineering Research Center of Carbon Capture and Storage Technology, Department of Geology, Northwest University, Shaanxi, Xi'an 710069, China;

  • 收录信息 中国科学引文数据库(CSCD);
  • 原文格式 PDF
  • 正文语种 eng
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