【摘要】 综合运用岩心、钻井、测井及地震资料,对潍北凹陷古近系孔一段的地层特征及沉积演化进行研究。结果表明:潍北凹陷孔店组一段可以划分为3个亚段、11个砂层组。在西部鄌郚—葛沟断裂和东部昌邑—大店断裂控制下,地层东西向发育稳定,仅在北部洼陷带地层显著加厚;在北部古城—潍河口断层控制下,地层向南部超覆,地层由北向南变薄。潍北凹陷孔店组一段主要发育扇三角洲相和湖泊相,南部斜坡带发育小范围三角洲相。孔一下亚段,物源供给充足,北部洼陷带、瓦城断阶带和灶户断鼻带发育大规模的扇三角洲相;孔一中亚段,湖盆水体变浅,物源供给减少,北部洼陷带、瓦城断阶带和灶户断鼻带继承性发育扇三角洲相,但分布范围变小;孔一上亚段,湖盆水体最浅,物源供给少,全区发育滨浅湖亚相,仅在央斜4井区和昌11井区发育小范围的扇三角洲相沉积。更多还原

【Abstract】 Based on the comprehensive analysis of cores, drilling well,logging and seismic data,the stratigraphic characteristics and sedimentary evolution in the Member 1 of Paleogene Kongdian Formation in Weibei Sag was analyzed.This study suggests that the Member 1 of Kongdian Formation was divided into 3 sub-members,containing 11 sand sets.Controlled by Tangwu-Gegou fault in the west and Changyi-Dadian fault in the east,the strata developed stably in the east and west,only in the northern sub-sag belt strata became thicker.Controlled by Gucheng-Weihekou fault in the northern Weibei Sag,the strata overlapped towards the south and thinned generally from north to south.Fan delta facies and lacustrine facies mainly developed in Member 1 of Kongdian Formation in Weibei Sag,and delta developed in small scale in the southern slope belt.During the development of the lower submember of Member 1 of Kongdian Formation,sediment supply was abundant,which formed the large-scale fan-deltas in northern sub-sag belt,Wacheng fault-step belt and Zaohu fault-nose belt.During the development of the middle submember of Member 1 of Kongdian Formation,the depth of water became shallower and sediment supply decreased,fan-deltas inherited the development in northern sub-sag belt,Wacheng fault-step belt and Zaohu fault-nose belt,which distributed in small scale.During the development of the upper submember of Member 1 of Kongdian Formation,the depth of water became the shallowest,the whole area developed shore-shallow lacustrine facies,and only small-scale fan-deltas developed in Wells Yangxie 4 and Chang 11.更多还原