叠前同时反演在浅层疏松砂岩储层预测中的应用

摘要

L盆地茨营组广泛发育扇三角洲沉积体系的陆相断陷弧盆沉积,储集层埋藏浅,成因复杂,具有高孔中渗或高孔低渗特征,是典型的浅层疏松砂岩储层.储层横向变化较大,非均质性较强,通过传统反演获取的结果,难以反映岩性特征,弹性阻抗和AVO技术无法对其进一步深度刻画.因此运用叠前同时反演技术对该区浅层疏松砂岩储层进行预测,结果发现有利储层预测趋势与井上吻合较好,能有效预测含气砂体的分布范围,具有良好的应用效果.%Ciying Formation in L Basin,which has the shallow layer,is characterized by shallow bury and complex geological origin.As the reservoir in Ciying Formation has high porosity and moderate permeability or high porosity and low permeability,it is a typical unconsolidated sandstone reservoir.With its rapid lateral variation and strong anisotropism,it's very difficult for elastic impedance and AVO techniques to make further distinction.In view of such a situation,the authors took advantage of prestack simultaneous inversion to make a prediction of shallow unconsolidated sandstone reservoirs.Based on seismic data,logging information and rock physics information,the authors applied prestack simultaneous inversion to finally get several elastic parameters such as P-impedence,S-imedence,and density.With these attribute parameters,the reservoirs can be easily and effectively predicted.