【摘要】 结合岩心、测井资料,认为陇东地区沉积砂体主要为水下分流河道、河口坝砂体。结合成岩作用分析及成岩序列划分,认为在早白垩世末最大排烃期后,主要有连晶方解石对粒间物质和粒缘的交代、强酸性流体对杂基和粒缘的溶蚀及长石溶蚀三种成岩作用。综合沉积成岩作用分析,在早白垩末最大排烃期,油气运聚的优势通道在镇原—西峰—庆阳一带。更多还原

【Abstract】 Through comprehensive study on the cores and well logs, the author believes that the sandstone mainly comes from subaquatic distributary channel and mouth-bar. Since a great deal of oil and gas was expelled from source rock, three diagenesis happened, calcite cementation, dissolution of feldspar, the matrix corrosion by acid. Considering the sedimentation and diageneses, during the period a great deal of was expelled, the migration path mainly lies in the area of xifeng, qingyang and zhenyuan.更多还原