准噶尔盆地滴南地区上乌尔禾组砂砾岩体裂缝测井响应与多信息融合预测

Logging response and multi⁃information fusion prediction of glutenite body fractures in Upper Wuerhe Formation of Dinan area in Junggar Basin

准噶尔盆地滴南地区上乌尔禾组砂砾岩储层基质物性差、裂缝发育、非均质性强,裂缝特征及分布规律尚不明确,严重制约了下步的油气勘探开发。为此,通过成像测井、声波远探、单井裂缝识别和地震多属性融合等技术综合表征并对裂缝分布进行预测,利用深度学习法建立裂缝解释模型及裂缝密度预测模型,在各组裂缝密度体约束下,采用非条件模拟技术计算各组裂缝的DFN三维网络模型。结果表明:研究区主要发育近南北走向、高角度的未充填缝,乌二段比乌一段裂缝更发育;滴南地区上乌尔禾组砂砾岩裂缝共发育的4种模式,有效识别了单井裂缝的发育特征;通过输入地震几何属性,研究区平面上北东向走滑断裂派生出的近南北向裂缝最为发育,其次为近北东向和近北西西向,低角度裂缝分布最少。借助测井解释成果、试油和生产指数等动态资料对裂缝预测结果进行了验证,结果表明近南北向的裂缝发育带控制了砂砾岩储层的富集高产,同时依据裂缝型油层的发育厚度预测出了下步勘探部署的有利目标区。

Upper Wuerhe Formation in Dinan area of Junggar Basin is characterized by poor matrix property,highly developed fractures and high heterogeneity,with unclear fracture characteristics and distribution law,seriously re-stricting further oil and gas exploration and development.Therefore,fractures are comprehensively characterized via image logging,acoustic remote detection,single-well fracture identification and seismic multi-attributes fusion techniques,and fracture interpretation model and fracture density prediction model are established by deep learn-ing method.Constrained by different groups of fracture density volumes,DFN 3D network models of different groups of fractures are calculated by using unconditioned simulation technique.The results show that unfilled frac-tures with nearly N-S strike and high angle are mainly developed in studied area,and fractures are more developed in Wu2 Member than that in Wu1 Member.4 patterns of fractures development of Upper Wuerhe Formation in Di-nan area effectively identify development characteristics of single-well fractures.Based on the input of seismic geo-metric attributes,near N-S fractures derived from N-E strike-slip faults are the most developed in studied area areal-ly,followed by near N-E and N-W fractures,and low-angle fractures distribution is the least.Fracture prediction re-sults are verified by dynamic data of logging interpretation,formation test and production index.The results show that near N-S fracture development zone controls the enrichment and high production of glutenite reservoirs,mean-while,favorable target area for further exploration deployment is predicted according to development thickness of fractured reservoirs.