【摘要】 综合岩心、地震、测井等资料,对民丰洼陷沙四段近岸水下扇砂砾岩体沉积特征进行了研究。结果表明,该类沉积体发育在陡岸靠近断层下降盘的深水区,在盆地的深陷扩张期有较多分布;平面为扇形,纵剖面上呈楔形,垂向上具有向上变细的正旋回特征,由近源至远源可细分为内扇、中扇、外扇3个亚相,在主要井段上可清楚识别。近岸水下扇中扇辨状水道和前缘砂体具有良好的储集物性,它以其有利的生储盖组合条件成为油田具有潜力的勘探目标之一。更多还原

【Abstract】 Based on core,seismic and well logging data,the sedimentary characteristics of nearshore subaqueous fans are studied in the fourth member of Shahejie Formation in Minfeng sub-sag.The results show that the sedimentary body are developed at deep water area,closing to downthrown side of fault,especially in expension stage of basin.On the plane,they are like fan.While on the section they are cuniform pattern.The grain size becomes fine down to up in vertical.The fans can be further divided into three subfacies including inner fan,middle fan,and outer fan,which can be clearly identified in main well section.The braided channel and middle fan leading edge have good reservoir property,so nearshore subaqueous fans become one of potential exploration targets.更多还原