永进油田西山窑组储层预测方法

现已探明准噶尔盆地永进油田具有上亿吨的石油地质储量,其主力层系之一为侏罗系西山窑组,但其储层埋藏深、非均质性强、储集物性较差,表现为砂、泥岩速度混杂、地震反射同相轴与砂、泥岩对应关系不明确等特征。分析研究认为,自然伽马曲线与岩性具有较好对应关系,能够反映储层的地球物理特征,通过采取波阻抗反演技术有效识别了目的层段砂、泥岩的空间分布情况,并利用"空变时窗"地震属性优化分析技术有效地预测、评价了储层。

Methods for Reservoir Predicting in Xishanyao Formation in Yongjing Oifield

It was proven that in Yongjing Oilfield of Junggar Basin there were a hundred million tons petroleum geological reserves, Jurassic Xishanyao Formation was one of major strata, but the reservoir was buried deeply with strong heterogeneity and poor reservoir physical property, it had the characters of sandstone mixed with mudstone and the corresponding relation between axis of seismic reflection and sandstone and mudstone was unclear. Analysis shows that the corresponding relation between GR curve and lithology was good, by which the geophysical characters could be reflected in the reservoir. The technique of wave impedance reverse simulation is used to recognize the distributions of sandstone and mudstone in the target zones, the technique of variational time-window for seismic attribute is used for effectively predicting and evaluating the reservoirs.