洪积相成因大型复合砂砾岩体的单期水道识别及其意义

以洪积扇现代沉积考察和露头研究为基础,通过岩心井标定小井距和对子井,结合生产测试资料,确定洪积扇相复合砂砾岩体的单期水道三维空间定量分布参数及剩余油分布模式.研究表明:扇顶亚相为复合型砂砾岩体,垂直物源为多个单期水道垂向加积切割叠置,延伸宽度为250～750 m,厚度为2～6 m,顺物源为多个单期水道呈楔形叠瓦状前积叠加,延伸长度为700～1.750 m,厚度为4～6 m,整体的水道宽厚比小;扇中亚相砂砾岩体具有多期水道侧向叠置的特点,垂直物源方向的单期水道厚度为2～4 m,延伸宽度为200～1.000 m,顺物源方向单期厚度为6～10 m,延伸长度为700～3.250 m;剩余油多分布在单期水道的中上部、侧缘上倾尖灭部、不同成因单期水道砂砾岩体的镶嵌部、同一成因不同期次水道的接触部.

Single channel identification in large-scale complex glutenite of alluvial fan and its significance

The three-dimensional distribution parameters of single channel and remaining oil mode about complex glutenite of alluvial fan were confirmed by means of small well spacing and two-pair wells, which were calibrated by core and testing data of well on the basis of modern deposit review and outcrop. The results show that the fanhead subfacies is complex glutenite. The sedimentary source on the vertical orientation are multiples of single channels cutting and overlying, and the single channel has a thickness of 2-6 m and an extension width of 250-750 m. The sedimentary source on the parallel orientation is foreset overlying of many single channels taking on cuneiform and imbricated shape, and the single channel has a thickness of 4-6 m and an extension length of 750-1.750 m. The middle-fan subfacies are characterized by multiple channel lateral overlying, and the single channel has a thickness of 2-4 m and an extension width of 200-1.000 m on the vertical orientation of sedimentary source. The single channel has a thickness of 6-10 m and an extension length of 700-3.250 m on the parallel orientation of sedimentary source. The remaining oil mainly distributes middle-upper location, lateral margin updip piching localization of single channel, mosaic location of different genesis single channel, and contiguous location of different channel for identical genesis.