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永区位于苏北盆地东台坳陷中部,其油藏类型复杂,具有多样性。以岩石物理研究为基础,利用叠前地震反演技术对研究区的储层及烃类进行预测。通过测井曲线校正与标准化,进行有效的地层对比,最大程度反映地层岩石的真实物理特征,确保地质认识的准确性。通过对不同岩石物理弹性参数进行岩性及流体的敏感性分析,确定密度为叠前地震反演的最佳参数。采用近似Zeoppritz方程求解地震参数的方法进行叠前密度反演,结合井震对比表明,叠前密度反演结果的横向及纵向分辨率较高,能较好地预测研究区的储层展布; 受储层复杂性的制约,叠前密度反演难以完全揭示油气在储层中的分布特征,仅能预测部分烃类储层的分布。
The Yong district is located in the central part of the Dongtai Depression in the Northern Jiangsu Basin. Its reservoir types are complex and diverse. Based on the rock physics research, prestack seismic inversion technique is used to predict the reservoir and hydrocarbons in the study area. Through the calibration and standardization of well logging curves, effective stratigraphic comparison is made to reflect the true physical characteristics of formation rocks to the greatest extent and ensure the accuracy of geological cognition. Through the lithology and fluid sensitivity analysis of different rock physical elastic parameters, the optimal parameters for the seismic inversion of prestack sediment are determined. Prestack density inversion is carried out by using approximate Zeoppritz equation to solve seismic parameters. Comparing well logging results shows that the horizontal and vertical resolution of prestack density inversion results are high, which can well predict the reservoir distribution in the study area. Constrained by reservoir complexity, it is difficult to fully reveal the distribution characteristics of oil and gas in reservoirs by prestack density inversion and only to predict the distribution of some hydrocarbon reservoirs.