Application of spectral decomposition technology to the shale reservoir prediction:A case study of Yuqia sag in Qaidam Basin
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摘要:
针对柴达木盆地北缘鱼卡凹陷中侏罗统大煤沟组泥页岩, 利用地震频谱曲线在不同流体介质储层中的形态、斜率、主频与中心频率的差值等属性参数特征, 识别陆相泥页岩层系的地震频谱属性特征, 预测含气性。研究结果表明, 中侏罗统大煤沟组上部能量系数较低, 平均为0.6719, 下部能量系数较高, 平均为0.7521, 结合现场含气量和全烃特征认为, 可以以能量系数0.7为界线, 作为识别下部和上部含气性的标志, 下部明显比上部含气性好。平面上进一步圈定了2个有利目标区, 得到柴页1井勘探验证。因此, 频谱分解技术可应用于中国陆相页岩气的勘查开发。
Abstract:Spectral decomposition technology has been successfully used in the conventional oil and gas and marine facies shale gas ex-ploration and development, but it has not been yet used in continental shale gas exploration practice. The seismic spectrum curves in different fluid reservoirs have different characteristics in such aspects as shapes, slopes, values of dominant frequency and central frequency. According to these features, continental seismic spectrum properties of mud shale in the Middle Jurassic Dameigou Formation of Yuqia sag within northern Qaidam Basin were identified, and gas potential was predicted. The results suggest that the energy coefficient is low in the upper part of Middle Jurassic Dameigou Formation with an average of 0.6719, while it is high in the lower part with an average of 0.7521. The gas content in the field and the total hydrocarbon characteristics show that the gas content in the lower part is better than that in the upper part, with the energy coefficient of 0.7 as the boundary. On such a basis, two favorable tar-get areas were delineated and one of them was drilled as Chaiye 1 well. Therefore, spectral decomposition technology can be used in continental shale gas exploration and development.
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Keywords:
- spectral decomposition /
- Qaidam Basin /
- continental facies /
- shale gas
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致谢: 成文过程中得到中国科学院地质与地球物理研究所张晓宝研究员，青海油田勘探开发研究院甘贵元、赵为永高级工程师的指导和帮助，在此深表感谢。
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图 1 能量比值法预测储层含油气性原理示意图
Figure 1. Oil and gas reservoir prediction principle with energy ratio method
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图 2 柴达木盆地北缘中侏罗世岩相古地理[②]
Figure 2. Jurassic lithofacies palaeogeographical map of the northern margin of the Qaidam Basin
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图 4 龙1井合成地震记录与井旁地震道对比图
Figure 4. Comparison between synthetic seismogram and adjacent well seismic trace of Long 1 well
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图 5 龙1井井旁地震剖面单道频谱分析(a)和能量系数曲线（b）
Figure 5. Seismic profile analysis of single channel spectrum(a) and energy index curve (b) in Long 1 well
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图 6 能量系数统计交汇图
（图右侧数字表示地震道号，上表示大煤沟组上部，下表示大煤沟组下部）
Figure 6. Coefficient of energy statistical scatter diagram
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图 8 某地震剖面J2-1上部能量系数曲线
Figure 8. Energy coefficient comparison chart for the upper part of Seismic J2-1
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