准噶尔盆地西北缘车排7井区八道湾组顶部有利储层分布预测

Prediction of Favorable Reservoir Distribution on the Top of Badaowan Formation in Wellblock Chepai 7,Northwestern Margin,Junggar Basin

针对准噶尔盆地西北缘车排7井区八道湾组顶部有利储层分布及油水关系认识不清,导致油藏扩边评价难以取得进展的问题,综合运用录井、测井及地震等资料,通过沉积相划分、连井砂体对比、地震属性分析、地震波阻抗反演及地层切片等技术手段,对研究区内沉积相和有利储层分布进行精细研究。研究结果表明:八道湾组顶部主要发育扇三角洲前缘沉积亚相,水下分流河道是最有利储层;八道湾组顶部主要发育由西北向东南方向展布的3个相对独立的扇三角洲水下分流河道砂体,其中2个为含油气有利储层;车5027井和车369井所在砂体为2个不连通的独立砂体;车5027井和车排7井所在砂体可以分别向东南和东南、东北方向扩边评价。该研究成果对研究区八道湾组进一步勘探开发具有重要的指导意义。

Due to the poor understanding of favorable reservoir distribution and oil-water relationship in the top oil-gas-producing interval of the Badaowan Formation in the Wellblock Chepai 7,northwestern margin,the Junggar Basin,it is difficult to make progress in the evaluation of reservoir expansion.Based on logging,well testing and seismic data,the sedimentary facies and favorable reservoir distribution in the study area were carefully studied by means of sedimentary facies division,comparison of sand facies in continuous wells,seismic attribute analysis,seismic wave impedance inversion,stratigraphic slicing,etc.The results showed that there was fan prodelta sedimentary subfacies developed on the top of the Badaowan Formation,three relatively independent fan delta underwater distributary channel sand facies developed on the top of the Badaowan Formation from northwest to southeast,two of which were favorable oil and gas reservoirs.The sand facies of Wells Che 5027 and 369 were two independent disconnected sand facies.The sand facies of Well Che 5027 and Well Chepai 7 could be expanded in direction of southeast,southeast and northeast respectively.The study results play a guiding role in the further development of the Badaowan Formation in the study area.