Evaluation Method of Downhole Multi-Scale Fracturing Effect Based on Array Acoustic Logging
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摘要:
为有效监测水力压裂效果、提高储层压裂效果评价精度，基于阵列声波测井资料的井下压裂效果评价方法，采用反射斯通利波提取和成像技术定量表征近井筒压裂缝，建立适用于测井观测系统的叠前深度偏移成像算法，以实现远井压裂缝的高精度成像，形成了基于阵列声波测井的井下多尺度压裂效果评价方法，并在中国西部某油田X1水平井成功应用。研究表明，基于阵列声波测井资料评价的压裂缝发育程度与压裂液注入量呈正相关关系，并且压裂缝最为发育层段与地震蚂蚁体属性图中天然裂缝发育位置一致。基于阵列声波测井的井下压裂效果评价方法的提出，对表征井周数十米范围内不同尺度压裂缝的发育情况具有重要意义，对更好地发挥水力压裂技术对能源勘探开发行业的支撑作用具有一定指导意义。
Abstract:In order to effectively monitor the hydraulic fracturing effect and improve the evaluation accuracy of reservoir fracturing, an evaluation method of the downhole fracturing effect based on array acoustic logging data was adopted. The extraction and imaging technologies of reflected Stoneley wave were used to quantitatively characterize near-wellbore fractures, and a pre-stack depth migration imaging algorithm suitable for logging observation systems was proposed, achieving high-precision imaging of fractures in far from wells. In addition, an evaluation method of multi-scale fracturing effect based on array acoustic logging was developed and applied in horizontal well X1 in an oilfield in western China. The results show that the development degree of fractures evaluated based on array acoustic logging data is positively correlated with the injection amount of fracturing fluid, and the most developed zone of fractures is consistent with the development location of natural fractures in the seismic ant attribute map. The evaluation method of the downhole fracturing effect based on array acoustic logging is of great significance to characterize the development of fractures of different scales within tens of meters around the well, and it has certain guiding significance to better play the supporting role of hydraulic fracturing technologies for energy exploration and development industry.
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图 2 X1井斯通利波压裂缝成像处理结果
Figure 2. Imaging results of Stoneley wave for fractures in Well X1
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图 3 X1井远井筒压裂裂缝远探测偏移成像结果
Figure 3. Migration imaging results by remote detection of fractures far from wellbore of horizontal well X1
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图 4 X1井远井裂缝定量评价结果
Figure 4. Quantitative evaluation of fractures far from wellbore of horizontal well X1
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图 6 X1井基于声波测井资料的水力压裂缝评价效果
Figure 6. Hydraulic fracture evaluation effect of horizontal well X1 based on acoustic logging data
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图 7 X1井1-19压裂段的压裂液注入量
Figure 7. Fracturing fluid injection amount in fracturing stages 1–19 of horizontal well X1
表 1 基于声波测井资料的水力压裂评价标准
Table 1 Hydraulic fracturing evaluation criteria based on acoustic logging data
近井筒压裂缝发育情况 远井筒压裂缝发育情况 压裂评价标准 发育 发育 好 发育 不发育 中 不发育 发育 不发育 不发育 差 
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