川东北马路背地区须家河组储层综合预测

Comprehensive Prediction of Basal Reservoir in Xujiahe Formation,Malubei Area, Northeastern Sichuan Basin

川东北马路背地区陆相油气成藏地质条件复杂,储层沉积微相变化大,有效储层的分布受多重因素联合控制,识别难度大,造成该地区油气勘探进程缓慢。利用现有储层预测的成熟技术手段,采用AVA梯度和吸收衰减属性相结合的方法对马路背地区须家河组进行反演,得出该区上三叠统须家河组底部储层以河道沉积的砂体作为储集体,且裂缝较为发育,为裂缝—孔隙型含气储层的结论。

For continental reservoir of Malubei area,northeasternS ichuan Basin,the reservoir-forming geological conditions arev ery complicated,the sedimentary microfacies variation is largea nd the distribution of effective reservoir is affected by many factors simultaneously.So,it is very difficult to identify it resulted ina relatively slow exploration schedule.In this study,Xujiahe Formation is firstly inversed by means of mature reservoir predictiont echnology and a combined method of both AVA gradient and absorption attenuation attribute.And a conclusion that the basal reservoir is composed of fluvial sandstone and fractures are very developed,is obtained.The basal reservoir is a fractured-porous gas-bearing reservoir.