Abstract
准噶尔盆地西北缘二叠系中晚期地层大面积发育砾岩、砂质砾岩、砂质小砾岩等粗粒碎屑岩。通过对钻井、测井、录井、地震等资料的分析，认识到五八区上乌尔禾组主要发育冲积扇相及扇三角洲相，其中冲积扇相可分为扇根、扇中、扇端三个亚相，进一步细分为十个微相。通过对单个扇体的刻画，可以清晰认识到扇体的分布及叠置关系，这样结合“一扇一藏”理论对扇体进行油气的勘探与开发有很好的指导意义。 There widely exist coarse granular detrital rocks, such as conglomerate, sandy gravels, in middle- late permian series of northwest edge of Junggar Basin. Based on the analysis of the data on well drilling, logging and seism, we have recognized that alluvial fan and fan delta facies are widely developed in upper-WuErHe group of 5-8-area. Alluvial fan facies can be divided into three subfacies (fan-root, fan-middle and fan-terminal) and ten micro-facies. According to the detection of each fan body, the distribution and superimposed relationship of fan bodies can be well detected. As the traditional saying goes, “where there is alluvial fan, there is oil or gas”, it plays an important role in hydrocarbon exploration and production.
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