百21井区夏子街组二段沉积物源方向及沉积相特征

The Characteristics of Sedimentary Provenance and Facies of Second Member of Xiazijie Formation in Bai-21 Well Block, Junggar Basin

综合运用重矿物组合、地震相、波阻抗反演、单井与联井相剖面分析及高分辨率层序地层分析等手段,对克拉玛依百口泉油田百21井区中二叠统夏子街组二段沉积物源及沉积相特征进行分析,结果表明,夏子街组主要发育冲积扇沉积,主要物源方向为北北西向。百21井区夏子街组二段发育5个沉积旋回,下部2个旋回以辫状水道沉积为主,上部3个旋回以辫流带侧缘及漫溢带沉积为主,反映扇体沉积范围缩小的过程。

Based on the characteristics of heavy mineral combination, seismic facies, wave impedance inversion, the single well and multi- well facies section as well as the high-resolution sequence stratigraphy, the sedimentary provenance and sedimentary facies of the second member of Xiazijie formation in Bai-21 well block in Junggar basin are analyzed. The result shows that the Xiazijie formation developed an alluvial fan and the sedimentary provenance is in direction of north to slight west; the second member of the Xiazijie formation developed five sedimentary cycles, the lower two cycles are dominated by braided stream channel deposit and the upper three by lateral margin of 1 braided stream zone and over bank sand, reflecting the reducing process of the fan sedimentary scope.