松辽盆地松科2井下白垩统营城组火山-沉积序列精细刻画

发布时间：2018-04-02 10:03

  本文选题：营城组　切入点：沉积相　出处：《地学前缘》2017年01期

【摘要】：中国白垩纪大陆科学钻探松科2井连续获取营城组岩心365.32m,岩心直径为214mm,岩心收获率达98.47%,是迄今直径最大,收获率最高且保存最为完整的营城组岩心,这些宝贵资料为营城组研究提供了前所未有的机遇。营城组时期与Aptian-Albian对应。通过对松科2井营城组岩心的精细描述,揭示了营城组火山-沉积序列及其建造过程。营城组主要包括沉积岩与火山岩两大岩类,共计17种岩石类型,其中沉积岩9种(砾岩、粗砂岩、中砂岩、细砂岩、粉砂岩、粉砂质泥岩、泥岩,含角砾凝灰质砂岩、凝灰质砂岩)、火山岩类8种(流纹岩、流纹质角砾集块岩、流纹质角砾集块熔岩、流纹质熔结凝灰熔岩、流纹质含角砾熔结凝灰熔岩、隐爆角砾岩、安山质集块熔岩与凝灰岩)。沉积相为扇三角洲相,具体分为扇三角洲平原亚相、扇三角洲前缘亚相与前扇三角洲亚相,分流河道微相、扇间沼泽微相,水下分流河道微相、河口砂坝微相与静水泥质沉积微相。火山岩相包括爆发相和喷溢相,具体分为空落亚相、热碎屑流亚相、喷溢相中部亚相和上部亚相。沉积岩与火山岩交替出现于营城组中,主要发育3期沉积岩与3期火山岩,自下而上形成3个完整的沉积-火山旋回,即沉积岩Ⅰ-火山岩Ⅰ、沉积岩Ⅱ-火山岩Ⅱ和沉积岩Ⅲ-火山岩Ⅲ。这一发现对于重新认识营城组时期构造-火山-盆地充填规律,可能具有重要启示。文中精细的描述资料为今后相关的深入研究提供了迄今最精准的基本地质素材。
[Abstract]:The core of Yingcheng formation was continuously obtained from Songke 2 well of Cretaceous Continental Scientific drilling in China, with a diameter of 214mm and a yield rate of 98.47mm. It is the largest diameter, the highest yield and the most intact Yingcheng formation core, so far, the core of Yingcheng formation is the largest in diameter, the highest in yield and the most complete in preservation. These valuable data provide an unprecedented opportunity for the study of Yingcheng formation. The Yingcheng formation period corresponds to Aptian-Albian. Through the detailed description of the core of Yingcheng formation in Songke 2 well, The volcanic-sedimentary sequence of Yingcheng formation and its formation process are revealed. The Yingcheng formation mainly consists of sedimentary rocks and volcanic rocks. There are 17 types of sedimentary rocks, including 9 types of sedimentary rocks (conglomerate, coarse sandstone, medium sandstone, fine sandstone, siltstone). Silty mudstone, mudstone, breccia tuffaceous sandstone, tuffaceous sandstone, volcanic rocks, 8 kinds of volcanic rocks (rhyolite, fluid-gravelly breccia mass rock, fluid-grain breccia mass lava, fluid-grain melting-tuff lava, fluid-gravelly breccia lava, Crypto-explosive breccia, Anshanian mass lava and tuff. The sedimentary facies are fan delta facies, including fan delta plain subfacies, fan delta front subfacies and front fan delta subfacies, distributary channel microfacies, and fan-delta microfacies. Subaqueous distributary channel microfacies, estuarine bar microfacies and hydrostatic muddy sedimentary microfacies. Volcanic facies include eruption facies and spillage facies, which can be divided into empty subfacies, thermal clastic flow subfacies, The sedimentary rocks and volcanic rocks alternately appeared in Yingcheng formation, mainly developed 3 sedimentary rocks and 3 volcanic rocks, and formed three complete sedimental-volcanic cycles from bottom to top, I. e., sedimentary rocks 鈪，

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