【摘要】 准噶尔盆地玛湖凹陷下三叠统百口泉组的沉积背景分析表明,研究区存在东西2个方向的6个分支物源,古凸起及沟槽对水系具有分隔控制作用,控制砂体沉积。通过岩心观察,归纳总结出9种岩相,结合录井、测井资料分析,认为玛湖凹陷下三叠统百口泉组沉积相类型主要为扇三角洲相,并详述了7种微相的沉积特征。利用地质地震资料综合分析,确定出玛湖凹陷百口泉平面沉积特征,凹陷内发育6个受物源控制明显的扇体,相邻扇体在平原相带被凸起带分隔,在前缘相带内相互交汇叠置。更多还原

【Abstract】 The Mahu Depression located in the west of Junggar Basin which is a foreland basin formed in Permian period.The Mahu Depression pushed by West-Junggar orogenic zone from the west and pushed by Luliang uplift belt of the Junggar Basin from the east.Based on analysis of depositional background,such as residual thickness distribution map and heavy mineral association and distribution map of Baikouquan Formation in the Mahu Depression,it is considered that the bulges and grooves controlled drainage of the study formation.Also the study area exist six subsidiary provenances from north-west and north-east directions.The integration of data on core analysis,well-facies,logging data,seven fan-delta sedimentary microfacies types identified in Baikouquan Formation of the study area.After analyzed geological and seismic data,sedimentary facies type and sedimentary characteristics were found in the Baikouquan Formation of Mahu Depression.The formation of fans and sand body were controlled by the six subsidiary provenances.In the depression,each fan delta plain was divided by the palaeogeomorphic bulge between adjacent fans,but the fan delta fronts were overlapped in the depression center.更多还原