宽方位地震各向异性分析与校正在松辽盆地古龙沙页岩储层中的研究与应用

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Liyan Zhang, Ang Li
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引用次数: 0

摘要

中国松辽盆地北部的古龙沙格拥有丰富的页岩油资源,是一个极具勘探前景的页岩油区域。然而,该地区的青山口地层页岩油储层具有纵向厚度薄、水平异质性明显、频率范围有限、各向异性显著等特点,给准确预测目标区间内页岩油的 "甜点 "带来了困难。本手稿利用 Y3 研究区的宽方位和小幅地震数据,分析了青山口地层目标层的方位各向异性特征。考虑到现有椭圆速度拟合方法在方位各向异性校正中的局限性,采用非刚性动态匹配方法消除了方位各向异性时差对地震同相轴非同相叠加的影响,从而提高了地震资料的分辨率和成像精度。方位各向异性校正有效地将叠加剖面的频率范围扩大了 7 Hz,从而提高了研究区页岩油藏预测数据的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study and application of wide-azimuth seismic anisotropy analysis and correction in shale reservoir in Gulong Sag, Songliao Basin, China

The Gulong Sag in the northern Songliao Basin, China, possesses abundant shale oil resources and represents a highly prospective area for shale oil exploration. However, the Qingshankou formation shale oil reservoir within this region exhibits characteristics such as thin longitudinal thickness, pronounced horizontal heterogeneity, limited frequency range, and significant anisotropy that pose difficulties in accurately predicting the “sweet spot” of shale oil within the target interval. The azimuthal anisotropy characteristics of the target layer in the Qingshankou formation are analyzed in this manuscript, utilizing wide-azimuth and small bin seismic data from the Y3 research area. Considering the limitations of existing methods for fitting elliptical velocities in azimuthal anisotropy correction, the influence of azimuthal anisotropy time difference on the non-in-phase superposition of seismic in-phase axis is eliminated by employing a non-rigid dynamic matching method, thereby enhancing the resolution and imaging accuracy of seismic data. The azimuth anisotropy correction effectively broadens the frequency range of the stack profile by 7 Hz, thereby enhancing the reliability of data for shale oil reservoir prediction in the study area.

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来源期刊
Geosciences Journal
Geosciences Journal 地学-地球科学综合
CiteScore
2.70
自引率
8.30%
发文量
33
审稿时长
6 months
期刊介绍: Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.
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