多角度弹性阻抗反演在准噶尔盆地风城地区的应用

APPLICATION OF MULTI-ANGLES ELASTIC IMPEDANCE INVERSION IN FENCHENG AREA OF JUNGGAR BASIN

准噶尔盆地西北缘风城地区二叠系风城组岩性复杂,沉积岩、白云岩、火山岩三大岩类均有发育,储层预测困难,制约了该区的油气勘探。这里研究采用多角度弹性阻抗联合反演方法,针对目的层开展基于岩石物理建模考虑的测井资料分析与解释工作,选择合适的岩石物理建模方法来完成工区内所有井的横波预测,优选弹性参数建立工区岩性含油气性与弹性参数量板,针对工区复杂的构造背景,建立带逆断层的构造模型用于反演初始模型的建立。通过多次反演参数试验,完成了工区的储层预测工作。实际效果分析表明,多角度弹性参数反演结果与已钻井吻合较好,同时还预测了新的含油气区,证明了此项技术在该区行之有效。

Lithology is complicated in the Fencheng formation of Permian,Fencheng area,northwestern margin of Junggar basin.There are three major category of lithology of sedimentary rocks、dolomite and volcanic rocks,so reservoir prediction is difficult,which restricted exploration in the area.The research presented in this paper used multi-angle elastic impedance inversion method,carried out the well logging data analysis and interpretation based on consideration of rock physics modeling for the objective formation by selecting the appropriate rock physics model to forecasts shear velocity for all well in the region,optimizing elastic modulus and establishing plates of lithologic hydrocarbon and elastic parameters.By setting up the structural model with thrust fault for the inversion of the initial model and testing parameters of inversion several times,th reservoir forecasting is completed in the objective region.Actual results analysis shows that the multi-angle elastic inversion results has good agreement with drilled wells,and the new oil and gas areas are presdicted.The technology is proved effective in the area.