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| Quantitative analysis of seismic velocity model accuracy and its influence on migration imaging: A case study of ultradeep fault-controlled fractured-vuggy reservoirs in the Tarim Basin,China |
LIU Zhi-Yuan1,2( ), LIU Xi-Wu1,2(), YANG Wei3, ZHANG Qing3, XIAO Yan-Jun1,2 |
1. Key Laboratory of Oil & Gas Reservoir Geophysics SINOPEC, Beijing 100083, China
2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
3. Northwest Oilfield Company, SINOPEC, Urumqi 830011, China |
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Abstract Seismic velocity model accuracy significantly influences the quality of depth-migrated images.However,a quantitative analysis and clear understanding of this relationship remain lacking.Based on the seismic images of ultradeep fault-controlled fractured-vuggy reservoirs in the Tarim Basin,this study constructed a depth-domain numerical velocity model that approximates the conditions of subsurface media.The 3D seismic forward modeling was performed using a seismic acquisition and observation system for practical production.Different interval velocities within the numerical model were smoothed and used to quantitatively analyze their effects on reverse time migration(RTM) images based on identical parameters.Using seismic simulation data as input,the isotropic and anisotropic depth-domain velocity models were constructed following a standard industrial workflow.A quantitative analysis was subsequently conducted to analyze the differences of the constructed models and corresponding migration images from the numerical velocity model and its RTM image across different intervals and for various geological features.Overall,this study quantitatively analyzes the velocity accuracy of different velocity types in various intervals and its influence on migration imaging, obtaining several clear insights.
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Received: 07 February 2025
Published: 07 August 2025
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Three-dimensional numerical velocity model characteristics of ultra-deep fault-controlled fractured-vuggy reservoirs in the Tarim Basin
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Global smoothing profile on synthetic velocity
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RTM imaging profile corresponding to global smooth velocity of different scales
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Smooth velocity of different layers
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RTM image corresponding to smoothed velocities of different layers
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Comparative sections of horizon matching for different velocity models
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Percentage of velocity error between self-built velocity and original model
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Self-built VTI velocity error percentage and distribution statistics
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The RTM well-tie migration profiles corresponding to different velocity models
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平均深
度/m | 平均层速度
/(m·s-1) | 层位名 | ISO速度绝对
误差/(m·s-1) | ISO速度相
对误差/% | ISO深度绝对
平均误差/m | ISO深度相
对误差/% | VTI速度绝对
误差/(m·s-1) | VTI速度相
对误差/% | VTI深度绝对
平均误差/m | VTI深度相
对误差/% | | 4667 | 3820 | H1 | 123.34 | 3.2 | 70 | 1.5 | 80.2 | 2.1 | 21 | 0.45 | | 4929 | 3950 | H3 | 161.95 | 4.1 | 69 | 1.4 | 138.2 | 3.5 | 26 | 0.53 | | 6167 | 4660 | H5 | 243.32 | 5.2 | 111 | 1.8 | 205.0 | 4.4 | 53 | 0.86 | | 6828 | 4830 | H6 | 270.48 | 5.6 | 198 | 2.9 | 183.5 | 3.8 | 31 | 0.45 | | 7226 | 4650 | H7-T74 | 706.8 | 15.2 | 224 | 3.1 | 674.2 | 14.5 | 57 | 0.79 | | 7731 | 6088 | H8-T76 | 273.96 | 4.5 | 201 | 2.6 | 267.8 | 4.4 | 32 | 0.41 | | 8100 | 6247 | H10-T78 | 287.362 | 4.6 | 162 | 2.0 | 281.1 | 4.5 | 42 | 0.52 | | 8667 | 6406 | H14-T80 | 294.676 | 4.6 | 130 | 1.5 | 288.2 | 4.5 | 57 | 0.66 | | 9500 | 6750 | H18-T90 | 405 | 6.0 | 114 | 1.2 | 398.2 | 5.9 | 31 | 0.33 |
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Statistics of different layers' errors for ISO and VTI velocity
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