SEISMIC METHOD FOR SHALE OIL SWEET SPOT PREDICTION IN QINGSHANKOU FORMATION OF SANZHAO SAG, SONGLIAO BASIN
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摘要:
松辽盆地三肇凹陷上白垩统青山口组一段泥页岩油气资源丰富.为了厘清该区页岩油甜点分布，指导参数井部署，在单井甜点关键参数测井评价的基础上，利用三维地震数据，井震结合开展甜点预测方法研究.首先利用测井资料、岩心实验分析数据交汇分析，建立岩性、物性（孔隙度、渗透率）、含油性（饱和度）、有机地化参数（TOC、S1）、地层孔隙压力、地层可压性的测井评价模型；然后通过宽频约束反演技术预测岩性，应用叠前弹性参数反演预测物性、含油性和地层可压性，利用约束迪克斯公式反演与模型约束波阻抗反演结合技术预测地层压力；最终实现对地质甜点和工程甜点的"双甜点"预测，建立一套适合于松辽盆地青山口组页岩油地震甜点识别技术流程.实践表明，利用三维地震资料能有效预测页岩甜点区，实钻结果与钻前预测基本吻合，证明了本技术流程的有效性.
Abstract:The oil and gas resources are abundant in the shale of the first member of Qingshankou Formation in Sanzhao Sag, Songliao Basin. To identify the distribution of shale oil sweet spots in the area and guide the deployment of parameter well, the paper studies the sweet spot prediction method based on the logging evaluation of key parameters of single well sweet spot, 3D seismic data and well-seismic combination. First, the cross plot analysis of logging data and core experimental analysis data is used to establish logging evaluation model of lithology, physical properties (porosity and permeability), oil-bearing property(saturation), organic geochemical parameters(TOC and S1), formation pore pressure and compressibility; Then the broadband constrained inversion technology is applied to predict lithology, the prestack elastic parameter inversion to predict physical properties, oil-bearing property and compressibility, and combination of constrained Dix formula inversion and model constrained wave impedance inversion technology to predict formation pressure; Finally, a set of seismic sweet spot identification technology process suitable for the shale oil of Qingshankou Formation in Songliao Basin is established to realize the double sweet spots prediction of geological and engineering sweet spots. The practice shows that the 3D seismic data can effectively predict shale sweet spots, and the actual drilling results are basically consistent with pre-drilling prediction, which proves the effectiveness of technical process.
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Key words:
- Songliao Basin /
- Sanzhao Sag /
- first member of Qingshankou Formation /
- shale oil /
- sweet spot prediction
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