【摘要】 大兴断层是控制冀中坳陷廊固凹陷发育的边界断层 ,沙三下亚段沉积早期是 3条独立的同向断层 ,其间的槽状同向传递斜坡成为粗碎屑直接入湖的通道 ,沿传递斜坡形成砾岩水下扇 ,具有向上变细的正旋回水进序列 ;沙三下亚段沉积晚期至沙三上亚段沉积期 ,大兴断层连锁为统一的断层 ,主要沉积中心分布在断层连锁前的传递带之间 ,发育厚逾 3 0 0 0m的湖相烃源岩 ,使大兴砾岩体油源条件良好 ,成为油气富集体。该砾岩体的储集层属扇中亚相辫状水道沉积 ,发育粒间孔隙、粒内孔隙、裂缝等次生储集空间 ,砾石成分以白云岩为主的储集层物性好于砾石成分以灰岩为主的储集层 ,扇中亚相分布区的断裂背斜油气最富集 ,其次是扇根同生断阶带内的断鼻构造。图 1表 1参 7更多还原

【Abstract】 Daxing fault controlled the limitation fault of the development of Langgu sag in Jizhong depression .It consisted of three isolated same direction faults in the early deposition of under 3 rd member of Shahejie Formation.The same direction transmission slope is the entrance of sediment into the lake. The sediment is the sub lacustrine fan system along side the transmission slope,with a characteristics of the positive circle of progressive sequence.The Daxing fault became a chain unified between the lately under the 3 rd and up the 3 rd member of Shahejie Formation.The main deposition center distributed within the transmission slope before the fault linked.Daxing conglomerate body have ample oil and gas because it has the 3000m thickness lake facies mudstone.The reservoir is the braided channel deposit.Porosity is mainly consisted of secondary pores including intra and inter granular pore and fracture.The petrophysics of dolomite is better than that of limestone.The best hydrocarbon accumulation is the faulted anticlinal trap distributed the middle fan facies, the better is the faulted nose structure distributed on the fanhead.更多还原