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溱潼凹陷南部断阶带换带部位扇三角洲沉积体系是溱潼凹陷南部断阶带戴南组层序中最具特色的储集体类型。结合地震资料、钻井资料对溱潼凹陷南部断阶带草舍转换带沉积背景、沉积体系、沉积微相及沉积体平面及剖面特征进行详细剖析,认为溱潼凹陷南部断阶带转换带型扇三角洲沉积体系以牵引流沉积特征为主,局部具有重力流沉积特征。沉积砂体规模大,单砂层厚度大,由转换带部位向次深凹沉积旋回增多,砂体的层数和厚度明显加大。扇三角洲平原、前缘和前扇三角洲三个相带分异明显。
The fan delta depositional system in the southern part of the Qintong sag is the most characteristic reservoir type in the sequence of the Dainan Formation in the southern fault zone of the Qintong sag. Based on the seismic data and well drilling data, the sedimentary background, sedimentary system, sedimentary microfacies and the plane and section features of the grass-grass transition zone in the southern Qinghai Tintong Sag are analyzed in detail. It is concluded that the transitional belt fan in the southern Qintong Depression The delta sedimentary system is characterized by the sedimentary characteristics of the traction flow and locally with the gravity flow sedimentary characteristics. Sedimentary sand body is large in scale, and the thickness of single sand layer is large, and it increases from subtrochanteric to subdural sedimentary, and the number and thickness of sand bodies obviously increase. Fan delta plain, front and fan delta three phase belt obvious difference.