华北东部石炭纪—二叠纪沉积充填过程及其对物源区构造演化的响应
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马帅(1990—),男,山东东营人,副研究员,博士,从事沉积学及石油天然气地质综合研究。E-mail:mas0302@163.com。

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中国石化科技攻关项目“济阳坳陷中-古生界潜山储层成因机制与分布预测”(P19015-2),胜利石油管理局博士后科研课题“济阳探区下古生界沉积环境及岩相古地理研究”(YKB2101)。


Carboniferous-Permian sedimentary filling process in eastern North China and its response to tectonic evolution of provenance area
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    摘要:

    受古亚洲洋俯冲、闭合及华北板块北缘与西伯利亚板块之间碰撞作用的影响,内蒙古隆起在石炭纪—二叠纪发生了重要的构造隆升,控制着华北东部沉积盆地的形成发展与充填演化,并成为沉积盆地的物源区。通过对3 条野外地质剖面及盆地覆盖区大量钻井岩心开展岩石学、矿物学、沉积学及地球化学等方面的研究,对华北东部石炭系—二叠系进行详细的沉积体系研究及物源区构造演化分析。结果表明:华北东部石炭纪—二叠纪沉积盆地的古地理环境经历了陆表海—海陆过渡—陆相的演化过程,从早到晚依次发育台地-堡岛复合沉积体系、三角洲沉积体系及河流沉积体系,沉积相类型包括碳酸盐岩台地、潮坪、潟湖、障壁岛、三角洲、曲流河及辫状河等。砂岩碎屑颗粒成分及地球化学特征表明,物源区具有活动大陆边缘再旋回造山带及岛弧双重性质,母岩岩石组合为早古生代富燧石条带碳酸盐岩与中-新元古代碎屑岩、浅变质岩等先期沉积盖层,以及晚古生代岛弧火山岩、深成侵入岩和基底变质岩。华北东部石炭纪—二叠纪盆地沉降和充填速率、沉积演化过程以及碎屑岩颗粒组分变化、岩石地球化学特征等,充分响应了物源区随造山带在本溪组沉积时期—太原组沉积时期受持续洋-陆俯冲作用及陆缘岛弧的形成发生陆内隆升、山西组沉积时期—下石盒子组沉积时期古亚洲洋逐渐闭合及板块陆-陆碰撞导致物源区隆升加剧并伴有褶皱冲断、上石盒子组沉积时期进入板块强烈陆-陆碰撞及全面造山的构造演化过程。

    Abstract:

    Affected by the subduction and closure of the Paleo-Asian Ocean and the collision between the northern margin of the North China Plate and the Siberian Plate,the Inner Mongolia Paleo-Uplift underwent important tectonic uplift during the CarboniferousPermian period,and it controls the formation,development,and filling evolution of the sedimentary basin in eastern North China and has become the provenance area of the basin. By studying sedimentology,petrology,mineralogy,and geochemistry of three field geological profiles and a large number of drilling cores in the basin area,detailed sedimentary system and tectonic evolution of provenance area during the Carboniferous-Permian period in eastern North China were analyzed in this article. The results show that the paleogeographic environment of the Carboniferous-Permian sedimentary basin in eastern North China has experienced the evolution process of the epicontinental sea,sea-land transition,and continental facies. Platform-barrier coast sedimentary system,delta sedimentary system,and fluvial sedimentary system have been developed from early to late,and sedimentary facies include carbonate platforms,tidal flat,lagoons,barrier islands,delta,meandering rivers,braided rivers,etc. The composition of detrital particles and geochemical characteristics of sandstone indicate that the provenance area has the characteristics of an active continental margin recycling orogenic belt and island arc. The parent rock assemblage is composed of early Paleozoic flint-rich banded carbonate rocks,early sedimentary cap rocks such as Meso-Neoproterozoic clastic rocks and epimetamorphic rocks,and Late Paleozoic island arc volcanic rocks,plutonic intrusive rocks,and basement metamorphic rocks. The sedimentation,filling rate,sedimentary evolution process,variation of clastic grain composition,and petrogeochemical characteristics of the Carboniferous-Permian basin in eastern North China fully respond to the tectonic evolution process of the provenance area with the orogenic belt. Specifically,the provenance area undergoes intracontinental uplift due to continuous ocean-continent subduction and the formation of an island arc in the continental margin during the sedimentary period of the Benxi and Taiyuan Formations. In the sedimentary period of the Shanxi Formation-Lower Shihezi Formation,the paleo-Asian ocean gradually closes,and the collision between plates makes the uplift of the provenance area intensified with fold and thrust. During the sedimentary period of the Upper Shihezi Formation,the provenance area experiences an intense collision between plates and comprehensive orogenesis.

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马帅,王永诗,王学军,陈世悦,景安语,田雯,信延芳.华北东部石炭纪—二叠纪沉积充填过程及其对物源区构造演化的响应[J].油气地质与采收率,2023,30(4):1~20

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  • 在线发布日期: 2023-08-02