王斜119地区沙四段储层预测方法及应用

Method for prediction of Es_4 member reservoir and its application in Wangxie 119 area

王斜119地区沙四段为近几年来成功地利用测井约束反演技术进行储层横向预测的典型区块。该区油气藏类型主要以构造—岩性油气藏为主,岩性以灰质、泥质粉细砂岩为主,沙四段储层横向变化大,而且围岩中碳酸盐岩含量较高,砂泥岩速度差异小。因此,为了精确落实该区有利储层展布范围,利用相干技术进行精细、准确的断层落实,利用频率域储层特征曲线匹配技术进行特征曲线重构,从而进行测井约束地震反演、储层预测,经钻探证实该预测方法准确可行,钻探成功率高。

The Es4 member in Wangxie 119 area is a typical area where lateral reservoir variation is successfully predicted with logging-constrained inversion technology in recent years. Struc-tural-lithological reservoir is the principal reservoir pattern in the area. Es4 member, whose dominate lithology is lime and shale sand, varies tremendously in its horizontal direction. Since there is more limestone in its periphery, the difference in velocity between sand and shale is small. Therefore, in order to precisely reveal the productive accumulation zone, coherence technology was used to delineate faults and matching technique of reservoir-characteristic curve in frequency domain was used to reconstruct well logs, which was used for logging-constrained inversion and reservoir prediction can be done. It is confirmed by drilling results and the method is feasible and has a high successful rate of drilling.