Rock Physics Modeling and Fracture Prediction of Double Porosity Media in the Hutubi Area
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摘要:
呼图壁地区深层目标合层系白垩系清水河组与侏罗系喀拉扎组、头屯河组（K1q、J3k、J2t）具有规模储层且油气资源丰富，但传统孔隙介质岩石物理建模无法有效区分油气甜点与泥岩。本文在系统分析目标段测井曲线特征基础上，通过微分等效介质岩石物理模型进行横波速度校正，通过Gassman方程流体置换恢复纵横波速度比和纵波阻抗曲线原状地层响应特征，突出甜点储层与泥岩区分度；引入线性滑动理论，建立双孔介质裂缝型储层岩石物理模型。将原生孔隙的微分等效介质岩石物理模型与各向异性次生裂缝的线性滑动模型进行有机融合，实现呼1井-呼6井区孔缝型储层各向异性介质岩石物理建模，构建岩石物理量板。结合叠前OVT域地震数据各向异性反演，有效进行叠前AVAZ裂缝预测。本文形成一套完整的深层甜点预测方法技术流程，为类似探区深层目标勘探开发提供参考。
Abstract:The deep target strata K1q, J3k and J2t in the Hutubi area have large-scale reservoirs and abundant oil and gas resources, but the traditional rock physics modeling of porous media cannot effectively distinguish oil and gas desserts from mudstones. Based on the systematic analysis of the logging curve characteristics of the target section, the shear wave velocity is corrected by the differential equivalent medium rock physics model, and the VPVSC and PIMP curves are restored by the Gassman equation fluid replacement, which highlights the sweet spot reservoir and mudstone discrimination. The linear sliding theory is introduced to establish the rock physics model of fractured reservoirs in dual-porosity media. The differential equivalent medium rock physics model for primary pores and the linear sliding model for anisotropic secondary fractures are organically integrated to realize the anisotropic medium rock physics modeling of the pore-fracture reservoir in the Hu 1-Hu 6 well area, and the rock physics plate is constructed. Combined with the anisotropic inversion of pre-stack OVT domain seismic data, the dominant reservoirs are effectively predicted. This paper has formed a complete set of deep fracture prediction method and technical processes, that provide a reference for the exploration and development of deep targets in similar exploration areas.
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Keywords:
- anisotropy inversion /
- dual-porous medium /
- rock-physical /
- fracture prediction
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图 2 呼探1井（左）和呼6井（右）的测井解释成果对比图
Figure 2. Comparison of logging interpretation results of Hutan 1 well (left) and Hutan 6 well (right)
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图 3 呼101井各向同性介质岩石物理建模成果
Figure 3. Rock physics modeling results of isotropic medium in Hu 101 well
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图 4 岩石物理建模校正与储层流体置换校正效果图
Figure 4. Rock physics modeling correction and reservoir fluid replacement correction effect diagram
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图 5 呼6井双孔介质岩石物理评价成果图
Figure 5. The rock physics evaluation results of the double-porosity medium in Hu 6 well
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图 6 呼探1井双孔介质岩石物理评价成果图
Figure 6. The rock physics evaluation results of the double-porosity medium in Hutan 1 well
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图 8 呼探1井点OVT道集K1q顶面AVOZ曲线
Figure 8. AVOZ curve of K1q top surface of OVT gathers in Well Hutan 1
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图 10 呼探1井主测线裂缝强度剖面
Figure 10. Fracture strength profile of main survey line in Hutan 1 well
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图 11 清水河组（K1q）叠前AVAZ裂缝预测效果
Figure 11. Pre-stack AVAZ fracture prediction effect of Qingshuihe Formation (K1q)
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图 12 清水河组（K1q）黑框区域叠前AVAZ裂缝预测效果局部放大图
Figure 12. Local enlarged map of pre-stack AVAZ fracture prediction effect in black frame area of Qingshuihe Formation (K1q)
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图 13 清水河组（K1q）红框区域叠前AVAZ裂缝预测效果局部放大图
Figure 13. Local enlarged map of pre-stack AVAZ fracture prediction effect in red frame area of Qingshuihe Formation (K1q)
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图 14 喀拉扎组（J3k）叠前AVAZ裂缝预测效果
Figure 14. Prestack AVAZ fracture prediction effect of Kalazha Formation (J3k)
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图 15 喀拉扎组（J3k）黑框区域叠前AVAZ裂缝预测效果局部放大图
Figure 15. Local enlarged map of pre-stack AVAZ fracture prediction effect in black frame area of Kalazha Formation (J3k)
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图 16 喀拉扎组（J3k）红框区域叠前AVAZ裂缝预测效果局部放大图
Figure 16. Locally enlarged map of the pre-stack AVAZ fracture prediction effect in the red frame area of Kalazha Formation (J3k)
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