地质统计学地震反演技术在溱潼南华地区薄砂层的预测应用

Application of the Geostatistical Seismic Inversion in Thin Sand in Nanhua Area,Qintong Sag

溱潼凹陷南华地区阜三段储层呈"千层饼"特征,厚度薄,一般单层厚度约3m,横向变化快,如何精准地预测南华地区阜三段薄砂层一直是解释人员研究的目标。本文以测井、地震和地质统计资料为基础,采用地质统计学反演方法对南华地区砂体展布进行预测,结果表明:反演剖面层次较清晰、细节更加丰富;薄砂层有很好的反映,可识别3~5m厚砂岩;平面砂体呈席状或朵状、分布范围广,与沉积相研究规律一致。在该地区砂泥岩薄互层储层的识别中起到重要的作用,也为南华地区井位钻探提供了有利的依据。

The reservoir in the Ef-3 member of Nanhua area of Qintong sag is characterized by ＂multi-layered cake＂and is thin,the average thickness of the layer is about 3 m.The reservoir is changing fast,to identify the thin reservoirs in the Ef-3 member accurately has always been the goal of the geophysicist.In this paper,based on the data of logging,seismic and geologic statistics,using geostatistical inversion method for Nanhua area to predict the sand body distribution.The results showed that the inversion profile more clear,details more rich.Thin sand layer has a good reflection,can identify 3~5 mthick sand.Flat sheet or flower shaped sand body,distribution range,consistent with the research of sedimentary facies rule.The method may play an important role in thin reservoir prediction in this area,also can provide basis for the exploration and development in Nanhua area.