山东东部日青威盆地灵山岛地区下白垩统深水沉积特征及沉积模式  

Sedimentary Characteristics and Model of Lower Cretaceous Deepwater Deposits on Lingshan Island,Riqingwei Basin,Eastern Shandong,China

作　　者：刘汉青 周瑶琪[1] 董春梅[1,2] 陈彤彤 刘瑞杨 LIU HanQing;ZHOU YaoQi;DONG ChunMei;CHEN TongTong;LIU RuiYang(School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Key Laboratory of Reservoir Geology,Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]山东省油藏地质重点实验室,山东青岛266580

出　　处：《沉积学报》2025年第2期576-594,共19页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(42372156);山东省重点研发计划项目(2017CXGC1608);中国石化科技部独立课题项目(P20028);中国石化油气成藏重点实验室开放基金(HX20220005)。

摘　　要：【目的】深水沉积能在海底斜坡、深海平原和深海湖泊等区域内形成粗碎屑砂体沉积和细粒沉积物,近年来被越来越多的学者关注,但目前对其发育规律及沉积模式的认识尚存争议。【方法】以日青威盆地灵山岛地区下白垩统莱阳组为例,借助灵科1井岩心观察、薄片镜下鉴定和野外露头踏勘,从岩相组合、沉积作用类型、成因机理、流体演化特征、沉积模式等方面,深入探讨了深水沉积过程。【结果】(1)研究区早白垩世深水沉积岩相可划分为层状泥页岩相、变形构造泥岩相、变形构造泥质粉砂岩相、平行层理粉砂岩相、含泥质碎屑粉砂岩相、粒序层理细砂岩相、块状层理细砂岩相、交错层理细砂岩相、块状层理含砾砂岩相9种类型,并根据发育情况总结出5种岩相组合类型;(2)以岩相组合类型为基础,识别出滑塌沉积、砂质碎屑流沉积、浊流沉积、混合层沉积、底流沉积和深水悬浮沉积6种沉积作用类型;(3)在充分考虑盆地构造背景、深水沉积分布规律、重力流触发机制等因素的前提下,发现重力流从陆坡到盆底呈现出砂质碎屑流到砂质碎屑流—浊流再到浊流的演化特征,并以此为基础建立了以深水重力流为主导的灵山岛地区早白垩世深水沉积模式。【结论】研究成果不仅在灵山岛莱阳组深水细粒沉积物形成过程及流体演化机制两方面取得了新的认识,而且为该区域早白垩世时期古环境和古地理重建提供了证据。[Objective]In recent years,a growing number of scholars have focused on deep-water deposition,which can form coarse clastic sand bodies and fine-grained sediments along submarine slopes,abyssal plains,and abyssal lakes.However,the understanding of the development law and sedimentary model remains controversial.[Methods]Taking the Lower Cretaceous Laiyang Formation in the Lingshan Island of Riqingwei Basin as an example,with the help of core observations of well LK-1,thin-section microscopic identification,and outcrop exploration,the deep-water sedimentary process was evaluated using lithofacies assemblage,sedimentary types,genetic mechanism,fluid evolution characteristics,and sedimentary model[.Results](1)The Early Cretaceous deep-water sedimentary lithofacies in the study area can be divided into 9 types:layered shale,deformed structural mudstone,deformed structural argillaceous siltstone,parallel bedding siltstone,argillaceous clastic siltstone,sequence-bedding fine sandstone,massive bedding fine sandstone,cross-bedding fine sandstone,and massive bedding pebbled sandstone facies.Five types of lithofacies association are summarized based on the development situation.(2)Based on the lithofacies assemblages,six sedimentary types were identified,including slump,sandy debris flow,turbidity current,hybrid event bed,bottom current,and deep-water suspended deposits.(3)Considering the tectonic setting of the basin,distribution law of deep-water sediments,and triggering mechanism of gravity flow,gravity flow was found to present evolutionary characteristics of sandy debris flow to sandy debris flow-turbidity flow to turbidity flow from the continental slope to the basin floor.Thus,the Early Cretaceous deep-water sedimentary model dominated by deepwater gravity flow in the Lingshan Island was established.[Conclusions]The research results not only provide a new understanding of the formation process and fluid evolution mechanism of deep-water fine-grained sediments in the Laiyang Formation of Lingshan Island,but also provi

关 键 词：深水重力流 灵山岛 灵科1井 成因机制 沉积模式 

分 类 号：P512.2[天文地球—地质学]