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通过岩心观察描述,综合测井、录井、古生物、重矿物等资料,结合地震相分析,以瓯江凹陷构造演化及相对海平面变化为主线,从物源分析出发,综合分析瓯江凹陷明月峰组沉积相类型及沉积特征。晚古新世明月峰组沉积期,瓯江凹陷处于断拗转换阶段,沉积物源由凹陷西侧的闽浙隆起带酸性火山岩源区和凹陷东侧的雁荡低凸起提供,以闽浙隆起带物源占绝对优势,受中古新世至晚古新世中期大规模海侵的影响,相对海平面持续升高,凹陷东侧雁荡低凸起开始接受沉积,使得凹陷沉积范围达到断陷期最大,总体呈滨海—浅海沉积,闽浙隆起带物源供应充分,在凹陷西缓坡发育3个大型三角洲沉积,滨海沉积发育于凹陷西缘三角洲之间及雁荡低凸起位置,凹陷中央发育大范围的浅海沉积。控制明月峰组各沉积相空间展布的主控因素是构造和相对海平面变化,以相对海平面变化为主。
Through core observation and description, comprehensive logging, well logging, paleontology, heavy minerals and other data, combined with seismic facies analysis, the main evolution of the Oujiang depression and relative sea level changes, starting from provenance analysis, a comprehensive analysis of the moon Sedimentary Facies Types and Sedimentary Characteristics of. In the late Paleocene Mingyuefeng Formation, the Oujiang Sag was in the stage of fault-bend transition. The source of sediments was provided by the source rocks of the Fujian-Zhejiang uplift and the acidic volcanic source areas on the west side of the depression and the low Yandang uplift on the east side of the depression, Due to the influence of large-scale transgression from Middle Paleocene to mid-late Paleocene, the relative sea level continued to increase, and the lower reaches of the depression began to receive sediments, resulting in the depression depositional range reaching the depression The largest is the coastal-shallow sea sediments, and the sources of Fujian and Zhejiang uplifts are fully supplied. Three large delta deposits are developed in the west gentle slope of the depression. The coastal sediments are developed between the delta in the sag and the low uplift position of the goose. The central development of the depression Range of shallow sea sediments. The main controlling factors controlling the spatial distribution of sedimentary facies in Mingyuefeng Formation are the changes of tectonic and relative sea level and the relative changes of sea level.