Quantitative prediction of fracture scale based on frequency-dependent shear wave splitting

IF 3 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geophysics Pub Date : 2023-10-30 DOI:10.1190/geo2022-0652.1

Peilin Yu, Yuyong Yang, Qiaomu Qi, Huailai Zhou, Yuanjun Wang

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引用次数: 0

Abstract

The development of natural fractures has a significant impact on underground reservoirs and leads to seismic anisotropy. Furthermore, the scale of natural fractures directly affects the oil and gas preservation, hydraulic fracture construction, and production development of shale reservoirs. Shear-wave anisotropy is a frequency dependent parameter and the change in shear-wave anisotropy with frequency is a function of the fracture scale. We propose an innovative method for predicting the fracture scale quantitatively using frequency-dependent shear-wave anisotropy. The quantitative relationship between different fracture scales and the frequency-dependent response of the shear-wave splitting (SWS) anisotropy can be obtained using a dynamic rock physics model. The frequency-dependent shear-wave anisotropy was calculated via SWS analysis in the frequency domain, after which this quantitative relationship and the calculated frequency-dependent response was used to establish an objective function for inversion of fracture scale at different depths using the least-squares algorithm. We synthesized data under ideal conditions, tested the proposed method, applied our method to field data, and found that the quantitative prediction method of the fracture scale yielded reasonable prediction results. The shear-wave anisotropy was calculated based on the SWS analysis from the horizontal components of the upgoing wavefields of the field vertical seismic profile. We compared the fracture scale calculated from logging data using the proposed method, and the results obtained indicated that this method can successfully predict the fracture scale quantitatively.

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基于频率相关横波分裂的裂缝尺度定量预测

天然裂缝的发育对地下储层有重要影响，并导致地震各向异性。此外，天然裂缝的规模直接影响页岩储层的油气保存、水力裂缝建设和生产开发。剪切波各向异性是一个频率相关参数，剪切波各向异性随频率的变化是裂缝尺度的函数。我们提出了一种利用频率相关的剪切波各向异性定量预测裂缝规模的创新方法。利用动态岩石物理模型，可以得到不同裂缝尺度与剪切波分裂各向异性频率响应之间的定量关系。通过频域SWS分析计算出频率相关的剪切波各向异性，然后利用该定量关系与计算得到的频率相关响应建立目标函数，利用最小二乘算法反演不同深度的裂缝尺度。在理想条件下综合数据，对所提出的方法进行了验证，并将该方法应用于现场数据，结果表明裂缝规模定量预测方法预测结果合理。根据现场垂直地震剖面上行波场的水平分量进行SWS分析，计算剪切波各向异性。将该方法与测井资料计算的裂缝规模进行了对比，结果表明，该方法能够成功地定量预测裂缝规模。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geophysics 地学-地球化学与地球物理

CiteScore

6.90

自引率

18.20%

发文量

354

审稿时长

3 months

期刊介绍： Geophysics, published by the Society of Exploration Geophysicists since 1936, is an archival journal encompassing all aspects of research, exploration, and education in applied geophysics. Geophysics articles, generally more than 275 per year in six issues, cover the entire spectrum of geophysical methods, including seismology, potential fields, electromagnetics, and borehole measurements. Geophysics, a bimonthly, provides theoretical and mathematical tools needed to reproduce depicted work, encouraging further development and research. Geophysics papers, drawn from industry and academia, undergo a rigorous peer-review process to validate the described methods and conclusions and ensure the highest editorial and production quality. Geophysics editors strongly encourage the use of real data, including actual case histories, to highlight current technology and tutorials to stimulate ideas. Some issues feature a section of solicited papers on a particular subject of current interest. Recent special sections focused on seismic anisotropy, subsalt exploration and development, and microseismic monitoring. The PDF format of each Geophysics paper is the official version of record.