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在松辽盆地营城组火山岩中识别出5相15亚相。控陷断裂控制火山岩相分布,火山喷发中心沿大断裂呈串珠状分布。靠近深断裂一侧从下到上相序为喷溢相侵出相/火山通道相,远离深断裂一侧相序为喷溢相爆发相喷溢相或火山沉积相;横向上相序为火山通道/侵出相喷溢相爆发相火山沉积相。喷溢相呈席状披盖或丘状,中弱振幅,中频,连续性中差,见断续波状反射,横向宽约6~10km,纵向厚约200~400m。爆发相呈楔状或透镜状、中强振幅、中低频、连续性差中,横向宽约6~8km,纵向厚约100~200m。而火山通道相和侵出相呈(陡)丘状、中强振幅、低频、杂乱反射,仅分布在火山口附近,横向宽多小于2km,纵向厚约100~200m。火山沉积相呈上超充填,中强振幅,中频,连续性好,分布在低洼地区,横向宽约4~7km,纵向厚约50~150m。
Five phases and 15 subfacies are identified in the volcanic rocks of Yingcheng Formation in the Songliao Basin. Sag-controlled faults controlled volcanic facies distribution, and volcanic eruption centers were beaded along the major faults. The phase sequence from the bottom to the top near the deep fault is the effusive facies / volcanic channel facies, and the phase sequence away from the deep fault is the effusive facies or volcanic sedimentary facies; the lateral facies sequence is volcano Channel / Invaded facies Eruptive facies erupt volcano sedimentary facies. Spurting spill-like drape or mound shape, medium and weak amplitude, medium frequency, poor continuity, see the intermittent wavy reflections, lateral width of 6 ~ 10km, vertical thickness of about 200 ~ 400m. The eruption phase is wedge-shaped or lenticular, with moderate amplitude, low frequency and poor continuity. The horizontal width is about 6 ~ 8km and the longitudinal thickness is about 100 ~ 200m. The volcanic channel facies and invaded facies were (steep) mound, moderate amplitude, low frequency, disorderly reflection, only distributed around the crater, transverse width less than 2km, longitudinal thickness of about 100 ~ 200m. Volcanic sedimentary facies was super-filled, medium-strong amplitude, medium frequency, good continuity, distributed in low-lying areas, horizontal width of 4 ~ 7km, vertical thickness of about 50 ~ 150m.