结合模拟退火和模式搜索技术的半混合优化地震反演孔隙度和声阻抗绘图流程图

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Raghav Singh, S. P. Maurya, Brijesh Kumar, Nitin Verma, Alok Kumar Tiwari, Ravikant Tiwari, G. Hema, Ajay P. Singh
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引用次数: 0

摘要

孔隙度和声阻抗对于研究岩石和土壤的地下属性非常重要。孔隙度受矿物和流体类型及其在地下物质中分布的影响。声阻抗是地震反演中的一个关键参数,因为它控制着地震波在不同岩层界面上的反射和透射。利用地震反演绘制孔隙度和声阻抗图面临着一些挑战,如分辨率低、与其他优化技术相比收敛时间较长,以及需要处理大量数据集。为了应对这些挑战,我们目前的研究采用了一种半混合优化方法,将模式搜索(PS)方法融入到全球公认的模拟退火(SA)技术中。在我们设计的方法中,首先利用模拟退火过程对地震数据逐条进行细致的反演,随后整合模式搜索,从而进一步降低计算复杂度。模拟退火的输出结果是 PS 优化的基础,可防止其陷入局部最小值或最大值。为了评估该算法,我们使用合成数据进行了系统分析。混合优化方法表现出色,获得了高精度的反演结果,原始阻抗和反演阻抗之间具有显著的高分辨率和相关性。随后,我们将这种方法应用于加拿大阿尔伯塔省 Blackfoot 油田的实际地震反射数据。值得注意的是,反演确定了双向移动时间在 1055 至 1070 毫秒之间的沙道,其特点是阻抗低、孔隙度高,表明可能存在油气藏。在这种情况下,如果仅利用 SA 或 PS 优化,可能无法达到预期的性能水平。因此,新设计的半混合优化方法是一个非常值得推荐的解决方案,它有可能解决单个优化方法的限制,并提供全面的地下洞察力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A flowchart for porosity and acoustic impedance mapping using seismic inversion with semi hybrid optimization combining simulated annealing and pattern search techniques

A flowchart for porosity and acoustic impedance mapping using seismic inversion with semi hybrid optimization combining simulated annealing and pattern search techniques

Porosity and acoustic impedance are important in the study of subsurface properties of rocks and soil. Porosity is influenced by the type of minerals, and fluids, and their distribution within the subsurface material. Acoustic impedance is a key parameter in seismic inversion because it governs the reflection and transmission of seismic waves at interfaces between different rock layers. Mapping porosity and acoustic impedance using seismic inversion poses several challenges such as low resolution, longer convergence times compared to other optimization techniques, and handling large datasets. To address these challenges, our current study has employed a semi-hybrid optimization approach by incorporating a pattern search (PS) method into the globally recognized simulated annealing (SA) technique. In our devised methodology, seismic data is meticulously inverted, trace by trace, initially utilizing the simulated annealing process and subsequently integrating the pattern search which further reduces computational Complexity. The output from SA serves as the foundation for the PS optimization, preventing it from getting trapped in local minima or maxima. To evaluate the algorithm, we initiated a systematic analysis using synthetic data. The hybrid optimization method performed well, yielding highly accurate inversion results with a remarkable high resolution and correlation between original and inverted impedance. We then applied this approach to actual seismic reflection data from the Blackfoot field in Alberta, Canada. Notably, the inversion identified a sand channel between 1055 and 1070 ms two-way travel time, characterized by low impedance and high porosity, suggesting the potential presence of hydrocarbon reservoirs. The level of performance demonstrated in this context may not be anticipated when utilizing SA or PS optimization alone. Hence, the newly devised semi-hybrid optimization approach emerges as a highly recommended solution, offering the potential to address the constraints of individual optimization methods and deliver thorough subsurface insights.

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来源期刊
Marine Geophysical Research
Marine Geophysical Research 地学-地球化学与地球物理
CiteScore
2.80
自引率
14.30%
发文量
41
审稿时长
>12 weeks
期刊介绍: Well-established international journal presenting marine geophysical experiments on the geology of continental margins, deep ocean basins and the global mid-ocean ridge system. The journal publishes the state-of-the-art in marine geophysical research including innovative geophysical data analysis, new deep sea floor imaging techniques and tools for measuring rock and sediment properties. Marine Geophysical Research reaches a large and growing community of readers worldwide. Rooted on early international interests in researching the global mid-ocean ridge system, its focus has expanded to include studies of continental margin tectonics, sediment deposition processes and resulting geohazards as well as their structure and stratigraphic record. The editors of MGR predict a rising rate of advances and development in this sphere in coming years, reflecting the diversity and complexity of marine geological processes.
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