【摘要】 以精细岩心观察为基础,结合录井、测井和地震资料分析,对松辽盆地北部汪家屯地区泉头组四段(K1q4)沉积相特征及演化规律进行了详细研究。研究表明汪家屯地区K1q4底界面为三级层序界面,顶界面为最大湖泛面,内部可划分为3个Ⅳ级层序:Q4-sq1、Q4-sq2、Q4-sq3;K1q4整体上属于退积型浅水三角洲沉积,通过研究识别出三角洲平原和三角洲前缘两个亚相,进一步可划分为水上分流河道、支流间湾、水下分流河道等多个沉积微相;Q4-sq1～Q4-sq3沉积时期,总体上表现为由三角洲平原到三角洲前缘水体逐渐加深的沉积过程,各层序内部砂地比比值逐渐减小,有利储集砂体在Q4-sq1沉积期最为发育。更多还原

【Abstract】 Based on the fine core observation,logging and seismic data,the characteristics and evolution rules of sedimentary facies of the 4 th member of Quantou Formation of Wangjiatun Area in the Northern Songliao Basin were studied in detail.The results show that the bottom boundary of 4 th member of Quantou Formation is the third-order sequence boundary,and top boundary is a maximum flooding surface,the member can be divided into three fourth-order sequences,such as Q4-sq1,Q4-sq2,Q4-sq3.The sedimentary environment of the member belongs to regressive shallowwater delta,the delta plain and delta front are recognized,of which several microfacies such as distributary channel,tributary bay,submerged distributary channel are identified.During the deposition of the 4 th member of Quantou Formation,from Q4-sq1to Q4-sq3,the sedimentary facies is evolved from delta plain to delta front by rising lake level,the ratio of sandstone and strata has been reduced gradually,and the favourable reservoir sandstone is more developed in Q4sq1.更多还原