【摘要】 为揭示岩相组合和构型单元控制下的砂砾质辫状河内部渗流地质差异特征,采用岩石相组合及层次界面分析方法,结合采样样品的孔渗数据分析与统计资料,对新疆克拉玛依黑油山35露头剖面的岩相组合、构型界面及构型单元进行分析,提出了研究区岩相组合和构型单元控制下的渗流差异样式.结果表明:不同的河道加积和充填方式形成的不同岩相组合和构型单元控制了其内部渗流地质的差异样式.河道侧向迁移加积过程中,形成板状交错层理含砾-粗砂岩相沿侧向或向上过渡为水平层理泥质粉砂岩相的序列,构成了渗透率侧向均匀递变且向上降低型样式;砂质河道充填过程中,形成大型槽状交错层理含砾-粗砂岩相向边部和底部过渡为水平层理泥质粉砂岩相的序列,构成了渗透率向河道边缘和底部不明显降低的内部均质性样式;砂砾质河道充填过程中,形成大型槽状交错层理细砾岩相到粗砂岩相最后过渡为水平层理泥质粉砂岩相序列,构成了渗透率中心向四周降低型样式.更多还原

【Abstract】 In order to identify the internal percolation differences of sand-gravel braided river under the control of the lithofacies association and architecture unit,this study used the lithofacies association and hierarchical bounding surfaces,and took the porosity permeability data and statistical material of samples into consideration,and then analyzed the lithofacies association,architecture bounding surface and architecture unit of Heiyoushan 35outcrop section. And also,the study proposed the percolation difference styles under the control of the lithofacies association and architecture unit.The results show that different styles of percolation geological characteristics are controlled by different lithofacies association and architecture unit, which are caused by different accretion styles and infilling patterns of channel deposits.In the process of channel lateral migration and accretion,one sequence,which passes from conglomerate-coarse sandstone facies laterally or upwardly to horizontal bedding argillaceous siltstone facies,is formed,leading to the permeability lateral uniformed distribution and decreasing upward.However,in the process of sandy channel filling,another sequence,which passes from large tabular cross bedding conglomerate coarse sandstone facies to horizontal bedding argillaceous siltstone,is formed,leading to a homogeneous style of permeability which unobvious reduces towards the channel edge and bottom.Nevertheless,in the process of sandy-gravel channel filling,the third sequence is proposed,which passes from large tabular cross bedding fine conglomerate facies to coarse sandstone facies to horizontal bedding argillaceous siltstone facies,and the permeability decreases from center to all around.更多还原